Construction and Building Materials最新文献_第7页

Microstructure, durability and mechanical properties of high strength geopolymer concrete containing calcinated nano-silica fume/nano-alumina blend 含有煅烧纳米硅灰/纳米氧化铝混合物的高强度土工聚合物混凝土的微观结构、耐久性和力学性能

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-19 DOI: 10.1016/j.conbuildmat.2025.140903

Mohammed Abd El-Salam Arab , Ayman Sayed Mohamed , Mahmoud Kamal Taha , Ahmed Nasr

This study investigates the enhancement of green architecture by using materials with reduced environmental impact compared to conventional concrete, especially due to the global environmental concerns associated with cement production. Geopolymer concrete has emerged as a sustainable alternative due to its favorable environmental properties, and recent efforts focus on further improving its durability and mechanical performance through nanomaterials additives. In this research, an examination on the effects of nano-silica fume and nano-alumina, in both physical mixed and calcinated physical forms, on the microstructural, mechanical properties and durability of high-strength geopolymer concrete. The experimental work introduces a comparative study between nano-silica fume and nano-alumina blend in their physically mixed form and those subjected to calcination at temperatures of 600°C, 800°C, and 1000°C for eight hours. Mechanical properties evaluated include compressive, tensile, and flexural strength, alongside durability indicators such as sorptivity, water absorption, and acid resistance attack. Results demonstrate that blends of nano-silica fume and nano-alumina in both forms exhibit synergistic effects, yielding notable improvements in mechanical strength. Calcination at 800°C was identified as the optimal temperature for maximizing these performance gains. The refined microstructure achieved with nanomaterial additives, particularly nano-silica fume, significantly reduced water sorptivity and enhanced acid resistance, indicating improved durability. These findings highlight the potential of high strength geopolymer concrete containing the used nano-materials in sustainable construction applications.

{"title":"Microstructure, durability and mechanical properties of high strength geopolymer concrete containing calcinated nano-silica fume/nano-alumina blend","authors":"Mohammed Abd El-Salam Arab , Ayman Sayed Mohamed , Mahmoud Kamal Taha , Ahmed Nasr","doi":"10.1016/j.conbuildmat.2025.140903","DOIUrl":"10.1016/j.conbuildmat.2025.140903","url":null,"abstract":"<div><div>This study investigates the enhancement of green architecture by using materials with reduced environmental impact compared to conventional concrete, especially due to the global environmental concerns associated with cement production. Geopolymer concrete has emerged as a sustainable alternative due to its favorable environmental properties, and recent efforts focus on further improving its durability and mechanical performance through nanomaterials additives. In this research, an examination on the effects of nano-silica fume and nano-alumina, in both physical mixed and calcinated physical forms, on the microstructural, mechanical properties and durability of high-strength geopolymer concrete. The experimental work introduces a comparative study between nano-silica fume and nano-alumina blend in their physically mixed form and those subjected to calcination at temperatures of 600°C, 800°C, and 1000°C for eight hours. Mechanical properties evaluated include compressive, tensile, and flexural strength, alongside durability indicators such as sorptivity, water absorption, and acid resistance attack. Results demonstrate that blends of nano-silica fume and nano-alumina in both forms exhibit synergistic effects, yielding notable improvements in mechanical strength. Calcination at 800°C was identified as the optimal temperature for maximizing these performance gains. The refined microstructure achieved with nanomaterial additives, particularly nano-silica fume, significantly reduced water sorptivity and enhanced acid resistance, indicating improved durability. These findings highlight the potential of high strength geopolymer concrete containing the used nano-materials in sustainable construction applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140903"},"PeriodicalIF":7.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on corrosion mechanisms of locked coil wire ropes and corrosion fatigue performance of the Z-shaped steel wires

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140818

Liulu Guo , Bingjie Xu , Zhihua Chen , Hongbo Liu , Fan Zhang , Longxuan Wang , Zhengyan Yang

In this study, the corrosion mechanism and corrosion law of locked coil wire ropes are investigated using an acetic-acid accelerated salt-spray (AASS) corrosion test and Z-shaped steel wire. Subsequently, the fatigue-life of Z-shaped steel wire under different degrees of corrosion is obtained according to its performance in the fatigue test. The fatigue failure mechanism of a Z-shaped steel wire is studied by analyzing the fatigue fracture, and a fatigue-life prediction method is proposed based on a three-parameter Weibull distribution. Finally, a fatigue-life prediction method for locked coil wire ropes is proposed based on the corrosion law of locked coil wire ropes and fatigue performance of Z-shaped steel wires. The results indicate that the corrosion of locked coil wire ropes occurs only in the outer Z-shaped steel wire, the corrosion of the round steel wire can be ignored, and the existence of S-cracks in the fracture of the Z-shaped steel wire will accelerate fatigue failure. The results also verify that corrosion pits are the main source of fatigue in corroded Z-shaped steel wire, corrosion has a great impact on the fatigue life of steel wire. Under the conditions of 50 g/L NaCl solution concentration, 3.1–3.3 pH value, 95 % humidity and 35 ± 2°C temperature, salt spray accelerates corrosion for 3 months, and the fatigue life is reduced by about 40 %.

{"title":"Research on corrosion mechanisms of locked coil wire ropes and corrosion fatigue performance of the Z-shaped steel wires","authors":"Liulu Guo , Bingjie Xu , Zhihua Chen , Hongbo Liu , Fan Zhang , Longxuan Wang , Zhengyan Yang","doi":"10.1016/j.conbuildmat.2025.140818","DOIUrl":"10.1016/j.conbuildmat.2025.140818","url":null,"abstract":"<div><div>In this study, the corrosion mechanism and corrosion law of locked coil wire ropes are investigated using an acetic-acid accelerated salt-spray (AASS) corrosion test and Z-shaped steel wire. Subsequently, the fatigue-life of Z-shaped steel wire under different degrees of corrosion is obtained according to its performance in the fatigue test. The fatigue failure mechanism of a Z-shaped steel wire is studied by analyzing the fatigue fracture, and a fatigue-life prediction method is proposed based on a three-parameter Weibull distribution. Finally, a fatigue-life prediction method for locked coil wire ropes is proposed based on the corrosion law of locked coil wire ropes and fatigue performance of Z-shaped steel wires. The results indicate that the corrosion of locked coil wire ropes occurs only in the outer Z-shaped steel wire, the corrosion of the round steel wire can be ignored, and the existence of S-cracks in the fracture of the Z-shaped steel wire will accelerate fatigue failure. The results also verify that corrosion pits are the main source of fatigue in corroded Z-shaped steel wire, corrosion has a great impact on the fatigue life of steel wire. Under the conditions of 50 g/L NaCl solution concentration, 3.1–3.3 pH value, 95 % humidity and 35 ± 2°C temperature, salt spray accelerates corrosion for 3 months, and the fatigue life is reduced by about 40 %.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140818"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Anti-freezing performance and micro deterioration model for high-strength concrete modified with waste glass powder and eggshell particles

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140832

Xiaosa Yuan, Yanbo Zhou, Haipeng Yang, Mingjiang Dai, Fang Liu, Sitong Yan

In regions characterized by low temperatures, ensuring high frost resistance in high-strength concrete is essential as it significantly impacts the functionality of concrete structures. This research aimed to enhance the frost resistance of concrete by modifying the composition of cementitious materials to improve the microstructure of the concrete. High-strength concrete was prepared by replacing cement with a combination of waste glass powder (WGP) and eggshell particles (ESP). The study assessed the impact of various factors (individual WGP, individual ESP, combined addition waste glass powder and eggshell particles(WGP-ESP) content) on frost resistance based on spalling quantity, relative dynamic modulus, compressive strength, and alterations in the internal pore structure of the concrete. X-ray computed tomography (X-CT) was utilized for continuous monitoring of changes in the internal pore structure to establish a microscopic damage model with a three-dimensional fractal dimension. The results indicate that WGP displayed superior strength and frost resistance compared to ESP, while eggshell particles and waste glass powder high strength concrete(WEHSC) demonstrate enhanced frost resistance relative to eggshell particles high strength concrete(EHSC) and waste glass powder high strength concrete(WHSC). For all samples, W10E10 exhibited the most favorable frost resistance. After 200 freeze-thaw cycles, the compressive strength of W10E10 was 25.47 % higher than that of the control concrete. The impact of freeze-thaw cycles on the pore structure was quantified using the box-count fractal dimension, leading to the development of a micro-damage model. Additionally, the damage parameters exhibited a significant association with durability.

{"title":"Anti-freezing performance and micro deterioration model for high-strength concrete modified with waste glass powder and eggshell particles","authors":"Xiaosa Yuan, Yanbo Zhou, Haipeng Yang, Mingjiang Dai, Fang Liu, Sitong Yan","doi":"10.1016/j.conbuildmat.2025.140832","DOIUrl":"10.1016/j.conbuildmat.2025.140832","url":null,"abstract":"<div><div>In regions characterized by low temperatures, ensuring high frost resistance in high-strength concrete is essential as it significantly impacts the functionality of concrete structures. This research aimed to enhance the frost resistance of concrete by modifying the composition of cementitious materials to improve the microstructure of the concrete. High-strength concrete was prepared by replacing cement with a combination of waste glass powder (WGP) and eggshell particles (ESP). The study assessed the impact of various factors (individual WGP, individual ESP, combined addition waste glass powder and eggshell particles(WGP-ESP) content) on frost resistance based on spalling quantity, relative dynamic modulus, compressive strength, and alterations in the internal pore structure of the concrete. X-ray computed tomography (X-CT) was utilized for continuous monitoring of changes in the internal pore structure to establish a microscopic damage model with a three-dimensional fractal dimension. The results indicate that WGP displayed superior strength and frost resistance compared to ESP, while eggshell particles and waste glass powder high strength concrete(WEHSC) demonstrate enhanced frost resistance relative to eggshell particles high strength concrete(EHSC) and waste glass powder high strength concrete(WHSC). For all samples, W10E10 exhibited the most favorable frost resistance. After 200 freeze-thaw cycles, the compressive strength of W10E10 was 25.47 % higher than that of the control concrete. The impact of freeze-thaw cycles on the pore structure was quantified using the box-count fractal dimension, leading to the development of a micro-damage model. Additionally, the damage parameters exhibited a significant association with durability.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140832"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainable resource utilization of surface-modified waste rubber powder and fly ash in cement-based materials for enhancing mechanical and durability performance

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140870

Zhaorong Zhu, Caiwang Tai, Yiting Zhang, Yiyan Lu

Although the incorporation of recycled rubber particles (RP) into cement-based materials offers substantial environmental significance, its adverse impact on material strength restricts its widespread application in practical engineering. To address this limitation, this study focuses on developing a sustainable cement-based materials with superior mechanical and durability properties. A green and efficient surface modification of recycled rubber powder using tannic acid (TA) and Fe(Ⅲ) was employed to produce modified rubber powder (RTF). The RTF demonstrated good hydrophilicity and surface activity, forming numerous active sites on its surface that significantly enhanced the interfacial bond between the rubber particles and the cement matrix. Further investigations revealed that incorporation the RTF into cement-based materials and partially substituting cement with fly ash (FA) effectively mitigated the detrimental effects of rubber particles on mechanical properties. When FA replacement was maintained at 20 %, it optimized the material’s microstructure while markedly enhancing the mechanical strength and durability of the rubber-cement composites through its filling and pozzolanic effects. Additionally, the heavy metal components in the FA were effectively immobilized and encapsulated within the matrix. DFT calculations indicate that RTF possesses outstanding adsorption capacity for heavy metal ions, and its incorporation into cement-based materials significantly enhances the immobilization of heavy metal ions within the matrix. Thus, the development of this rubber-cement composites effectively facilitates the recycling of waste tires and fly ash from coal fired power plant, contributing to the promotion of economically viable and low-carbon green buildings.

{"title":"Sustainable resource utilization of surface-modified waste rubber powder and fly ash in cement-based materials for enhancing mechanical and durability performance","authors":"Zhaorong Zhu, Caiwang Tai, Yiting Zhang, Yiyan Lu","doi":"10.1016/j.conbuildmat.2025.140870","DOIUrl":"10.1016/j.conbuildmat.2025.140870","url":null,"abstract":"<div><div>Although the incorporation of recycled rubber particles (RP) into cement-based materials offers substantial environmental significance, its adverse impact on material strength restricts its widespread application in practical engineering. To address this limitation, this study focuses on developing a sustainable cement-based materials with superior mechanical and durability properties. A green and efficient surface modification of recycled rubber powder using tannic acid (TA) and Fe(Ⅲ) was employed to produce modified rubber powder (RTF). The RTF demonstrated good hydrophilicity and surface activity, forming numerous active sites on its surface that significantly enhanced the interfacial bond between the rubber particles and the cement matrix. Further investigations revealed that incorporation the RTF into cement-based materials and partially substituting cement with fly ash (FA) effectively mitigated the detrimental effects of rubber particles on mechanical properties. When FA replacement was maintained at 20 %, it optimized the material’s microstructure while markedly enhancing the mechanical strength and durability of the rubber-cement composites through its filling and pozzolanic effects. Additionally, the heavy metal components in the FA were effectively immobilized and encapsulated within the matrix. DFT calculations indicate that RTF possesses outstanding adsorption capacity for heavy metal ions, and its incorporation into cement-based materials significantly enhances the immobilization of heavy metal ions within the matrix. Thus, the development of this rubber-cement composites effectively facilitates the recycling of waste tires and fly ash from coal fired power plant, contributing to the promotion of economically viable and low-carbon green buildings.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140870"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of magnetic field characteristics on dynamic stray current corrosion behavior of U75V steel

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140810

Zhichao Cai , Jie Peng , Jianshou Fang , Zhixi Tang , Shan Lin , Xia Chen

The leakage of stray current (SC) in urban rail transit systems represents a prevalent engineering issue that contributes to electrochemical corrosion of rails, thereby posing significant safety risks and economic losses. Currently, the corrosion behavior of rails and its influencing factors under complex electromagnetic field conditions remain poorly understood. To investigate this issue further, this study employs a combined approach involving finite element simulation and experimental techniques. Initially, the characteristics of the magnetic field distribution during the rail return current process are analyzed. Based on this analysis, an experiment is planned to explore the electrochemical corrosion characteristics of U75V steel subjected to the combined effects of dynamic SC and magnetic fields. The corrosion behavior of U75V steel under static and dynamic magnetic fields is systematically analyzed using techniques such as polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results indicate that the size, direction, and dynamic characteristics of the magnetic field significantly influence the corrosion rate and the morphology of corrosion products. Notably, when the static magnetic field strength is 80 mT, the corrosion rate reaches its peak value. Furthermore, the influence of magnetic field strength on corrosion current density and charge transfer resistance demonstrates a distinct nonlinear behavior, thereby promoting the formation of Fe₂O₃ and Fe₃O₄. In conclusion, the findings of this study establish a solid theoretical foundation for understanding the corrosion behavior of rails in complex electromagnetic environments.

{"title":"Effect of magnetic field characteristics on dynamic stray current corrosion behavior of U75V steel","authors":"Zhichao Cai , Jie Peng , Jianshou Fang , Zhixi Tang , Shan Lin , Xia Chen","doi":"10.1016/j.conbuildmat.2025.140810","DOIUrl":"10.1016/j.conbuildmat.2025.140810","url":null,"abstract":"<div><div>The leakage of stray current (SC) in urban rail transit systems represents a prevalent engineering issue that contributes to electrochemical corrosion of rails, thereby posing significant safety risks and economic losses. Currently, the corrosion behavior of rails and its influencing factors under complex electromagnetic field conditions remain poorly understood. To investigate this issue further, this study employs a combined approach involving finite element simulation and experimental techniques. Initially, the characteristics of the magnetic field distribution during the rail return current process are analyzed. Based on this analysis, an experiment is planned to explore the electrochemical corrosion characteristics of U75V steel subjected to the combined effects of dynamic SC and magnetic fields. The corrosion behavior of U75V steel under static and dynamic magnetic fields is systematically analyzed using techniques such as polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results indicate that the size, direction, and dynamic characteristics of the magnetic field significantly influence the corrosion rate and the morphology of corrosion products. Notably, when the static magnetic field strength is 80 mT, the corrosion rate reaches its peak value. Furthermore, the influence of magnetic field strength on corrosion current density and charge transfer resistance demonstrates a distinct nonlinear behavior, thereby promoting the formation of Fe₂O₃ and Fe₃O₄. In conclusion, the findings of this study establish a solid theoretical foundation for understanding the corrosion behavior of rails in complex electromagnetic environments.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140810"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimizing hydration and performance of phosphogypsum based cementitious system through multiphase composites

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140848

Shouwei Jian , Xinxin He , Bo Peng , Xin Gao , Jianxiang Huang , Fei Dai , Jiaxuan Chen , Baodong Li

Thermal treatment of phosphogypsum (PG) to produce construction-grade gypsum is a promising approach for large-scale utilization. However, the single-phase composition of calcined gypsum necessitates the addition of retarders to control hydration speed, often compromising material performance. To address this, we propose a multiphase gypsum system that leverages synergistic interactions among various gypsum phases to regulate hydration kinetics. This study examines the workability, mechanical properties, water resistance, hydration heat, and microstructure of multiphasic PG. We systematically analyze the interaction mechanisms between different gypsum phases, including II-anhydrite (AII), III-anhydrite (AIII), β-hemihydrate (HH), and dihydrate (DH), within the multiphasic PG system. Results indicate that incorporating optimal amounts of AIII and AII effectively adjusts PG hydration process, enhancing workability and water resistance. Specifically, a composite of 30 % AIII and 20 % AII yields significant improvements in mechanical strength and water resistance (with a softening coefficient reaching 0.81), extends setting time, and reduces water demand. Interactions among AII, AIII, HH, and DH effectively regulate hydration rates in phosphorus-based gypsum cementitious materials. Early-stage hydration of AIII releases substantial heat, promoting the hydration of HH and AII. In turn, AII modulates HH’s hydration rate, providing a retarding effect that enhances early strength. At later stages, hydration of AIII and HH increases the exothermic rate of AII’s hydration, while DH serves as a nucleation site for AII crystallization, producing a dense structure. Additionally, unhydrated AII absorbs infiltrated water molecules, further improving water resistance and enhancing long-term strength.

{"title":"Optimizing hydration and performance of phosphogypsum based cementitious system through multiphase composites","authors":"Shouwei Jian , Xinxin He , Bo Peng , Xin Gao , Jianxiang Huang , Fei Dai , Jiaxuan Chen , Baodong Li","doi":"10.1016/j.conbuildmat.2025.140848","DOIUrl":"10.1016/j.conbuildmat.2025.140848","url":null,"abstract":"<div><div>Thermal treatment of phosphogypsum (PG) to produce construction-grade gypsum is a promising approach for large-scale utilization. However, the single-phase composition of calcined gypsum necessitates the addition of retarders to control hydration speed, often compromising material performance. To address this, we propose a multiphase gypsum system that leverages synergistic interactions among various gypsum phases to regulate hydration kinetics. This study examines the workability, mechanical properties, water resistance, hydration heat, and microstructure of multiphasic PG. We systematically analyze the interaction mechanisms between different gypsum phases, including II-anhydrite (AII), III-anhydrite (AIII), β-hemihydrate (HH), and dihydrate (DH), within the multiphasic PG system. Results indicate that incorporating optimal amounts of AIII and AII effectively adjusts PG hydration process, enhancing workability and water resistance. Specifically, a composite of 30 % AIII and 20 % AII yields significant improvements in mechanical strength and water resistance (with a softening coefficient reaching 0.81), extends setting time, and reduces water demand. Interactions among AII, AIII, HH, and DH effectively regulate hydration rates in phosphorus-based gypsum cementitious materials. Early-stage hydration of AIII releases substantial heat, promoting the hydration of HH and AII. In turn, AII modulates HH’s hydration rate, providing a retarding effect that enhances early strength. At later stages, hydration of AIII and HH increases the exothermic rate of AII’s hydration, while DH serves as a nucleation site for AII crystallization, producing a dense structure. Additionally, unhydrated AII absorbs infiltrated water molecules, further improving water resistance and enhancing long-term strength.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140848"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain response and creep behavior of asphalt mixture based on multi-damage fractional visco-elasto-plastic constitutive model

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140834

Xinzhou Li , Aimin Sha , Wenxiu Jiao , Yangsen Cao , Ruimeng Song

This study aims to accurately represent the strain response and cumulative strain of asphalt mixture by constitutive model and to further investigate its creep behavior. For this, dynamic loading tests of asphalt mixture were conducted under different temperature and stress conditions, and the investigation into the strain response variations showed that different mechanical properties of asphalt mixture have different evolutionary processes. Then, the fractional visco-elasto-plastic constitutive model was constructed to express the strain response under intermittent haversine loading. Furthermore, by analyzing the evolutions of the different mechanical properties, the multi-damage fractional visco-elasto-plastic constitutive model was developed by introducing multiple relative damage variables to reflect different mechanical properties. Subsequently, analytical solutions for strain response and cumulative strain were derived, and a methodology for identifying model parameters was proposed. The results demonstrated that effectiveness of model application was excellent: fitting correlation coefficients averaged above 0.997 for cumulative strain curves under 15 test conditions; fitting correlation coefficients for tens of thousands of strain response were mostly clustered above 0.98. Creep behavior of asphalt mixture expressed by MD-FVEP model was the dynamic evolution where viscous strain decreased and viscoplastic strain increased. The steady-state creep stage resulted from dynamic equilibrium between viscous strain gradually decreasing and viscoplastic strain gradually increasing. Evolutions of viscous and viscoplastic relative damage variables showed clear environmental correlations.

{"title":"Strain response and creep behavior of asphalt mixture based on multi-damage fractional visco-elasto-plastic constitutive model","authors":"Xinzhou Li , Aimin Sha , Wenxiu Jiao , Yangsen Cao , Ruimeng Song","doi":"10.1016/j.conbuildmat.2025.140834","DOIUrl":"10.1016/j.conbuildmat.2025.140834","url":null,"abstract":"<div><div>This study aims to accurately represent the strain response and cumulative strain of asphalt mixture by constitutive model and to further investigate its creep behavior. For this, dynamic loading tests of asphalt mixture were conducted under different temperature and stress conditions, and the investigation into the strain response variations showed that different mechanical properties of asphalt mixture have different evolutionary processes. Then, the fractional visco-elasto-plastic constitutive model was constructed to express the strain response under intermittent haversine loading. Furthermore, by analyzing the evolutions of the different mechanical properties, the multi-damage fractional visco-elasto-plastic constitutive model was developed by introducing multiple relative damage variables to reflect different mechanical properties. Subsequently, analytical solutions for strain response and cumulative strain were derived, and a methodology for identifying model parameters was proposed. The results demonstrated that effectiveness of model application was excellent: fitting correlation coefficients averaged above 0.997 for cumulative strain curves under 15 test conditions; fitting correlation coefficients for tens of thousands of strain response were mostly clustered above 0.98. Creep behavior of asphalt mixture expressed by MD-FVEP model was the dynamic evolution where viscous strain decreased and viscoplastic strain increased. The steady-state creep stage resulted from dynamic equilibrium between viscous strain gradually decreasing and viscoplastic strain gradually increasing. Evolutions of viscous and viscoplastic relative damage variables showed clear environmental correlations.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140834"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties and damage evolution of graphene oxide enhanced coal-based solid waste grouting materials

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140776

Aiwen Wang , Yang Wang , Yizhen Song , Wei Zhang , Changhong Ren

Improving the strength and toughness of fractured coal bodies during pressure relief in impact rock roadway drilling, a reinforced and toughened grouting material (PCGN) was developed using cement (P), coal gangue (CG), graphene oxide (GO), and nanosilica (NS) as raw materials. The stability and mechanical properties of PCGN were investigated through flowability experiments, water separation rate experiments, and uniaxial compressive strength (σ_c) and tensile strength (σ_t) experiments. The phase, microstructure, and pore characteristics of PCGN were analyzed via X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, the brittleness coefficient (BE) and static toughness (η) were used to evaluate the toughness of PCGN, and based on acoustic emission (AE) and digital speckle pattern (DIC) monitoring data, the fracture mechanism and crack propagation law of PCGN were studied. The results revealed the following. 1) The σ_c and σ_t of PCGN first increased but then decreased with increasing GO content, reaching their maximum values at 0.06 %. GO promoted the cement hydration reaction and reduced the porosity of PCGN. 2) CG and NS weakened the brittleness of the PCGN, and the BE first decreased and then increased with increasing CG and NS mass fractions. 3) The fracture mechanism of PCGN varied greatly at different levels of brittleness. As the BE decreases, the fracture mode of PCGN gradually evolves from large-scale multicrack splitting failure to small-scale uniform single crack shear failure.

{"title":"Mechanical properties and damage evolution of graphene oxide enhanced coal-based solid waste grouting materials","authors":"Aiwen Wang , Yang Wang , Yizhen Song , Wei Zhang , Changhong Ren","doi":"10.1016/j.conbuildmat.2025.140776","DOIUrl":"10.1016/j.conbuildmat.2025.140776","url":null,"abstract":"<div><div>Improving the strength and toughness of fractured coal bodies during pressure relief in impact rock roadway drilling, a reinforced and toughened grouting material (PCGN) was developed using cement (P), coal gangue (CG), graphene oxide (GO), and nanosilica (N<img>S) as raw materials. The stability and mechanical properties of PCGN were investigated through flowability experiments, water separation rate experiments, and uniaxial compressive strength (<em>σ</em><sub>c</sub>) and tensile strength (<em>σ</em><sub>t</sub>) experiments. The phase, microstructure, and pore characteristics of PCGN were analyzed via X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, the brittleness coefficient (<em>BE</em>) and static toughness (<em>η</em>) were used to evaluate the toughness of PCGN, and based on acoustic emission (AE) and digital speckle pattern (DIC) monitoring data, the fracture mechanism and crack propagation law of PCGN were studied. The results revealed the following. 1) The <em>σ</em><sub>c</sub> and <em>σ</em><sub>t</sub> of PCGN first increased but then decreased with increasing GO content, reaching their maximum values at 0.06 %. GO promoted the cement hydration reaction and reduced the porosity of PCGN. 2) CG and N<img>S weakened the brittleness of the PCGN, and the BE first decreased and then increased with increasing CG and N<img>S mass fractions. 3) The fracture mechanism of PCGN varied greatly at different levels of brittleness. As the BE decreases, the fracture mode of PCGN gradually evolves from large-scale multicrack splitting failure to small-scale uniform single crack shear failure.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140776"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal performance of precast concrete sandwich walls with a double-layer insulation system

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140785

Guochang Li , Xiao Li , Chen Fang , Runze Liu

The advances in technology and design principles have required the development of wall systems with superior thermal performance in cold climate regions. This paper aims to develop a thermal-efficient precast concrete sandwich wall (PCS wall) for engineering utilization and investigate its thermal performance under the conditions of steady heat conduction using experimental tests and finite element analysis. The innovative precast concrete sandwich wall was incorporated with a double-layer insulation system (PCS-DLI wall) which consisted of autoclaved aerated concrete (AAC) board and polyurethane (PU) insulation layer. In the experimental program, twelve PCS-DLI specimens were tested using the calibrated hot box method. The tested parameters included the insulation layer thickness, concrete type, steel material property, and connector number. In the modeling program, 3D nonlinear finite element models of the PCS-DLI walls were built and validated against the test results. Subsequently, the validated models were further utilized to analyze the heat-transferring mechanism of the PCS-DLI wall and conduct parametric studies that evaluated the effects of critical structural parameters on the thermal performance of the PCS-DLI wall. The results indicated that the PCS-DLI wall incorporating AAC board and stainless-steel connections exhibited superior thermal performance with a significant decrease in thermal transmittance in comparison to traditional PCS wall with lightweight aggregate concrete panels with carbon steel connectors. In addition, the utilization of AAC board as the inner wall effectively improved the thermal performance of the PCS wall and mitigate the effects of thermal bridges among the connectors. The optimization analysis was also performed to achieve the desired thermal performance of the PCS-DLI wall while minimizing the insulation layer thickness and connector number. The thermal transmittance of the PCS-DLI wall was 0.241 W/(m²·K), which was significantly less than the traditional PCS wall. These results provided design and application suggestions for the innovative PCS-DLI wall in diverse climatic regions.

{"title":"Thermal performance of precast concrete sandwich walls with a double-layer insulation system","authors":"Guochang Li , Xiao Li , Chen Fang , Runze Liu","doi":"10.1016/j.conbuildmat.2025.140785","DOIUrl":"10.1016/j.conbuildmat.2025.140785","url":null,"abstract":"<div><div>The advances in technology and design principles have required the development of wall systems with superior thermal performance in cold climate regions. This paper aims to develop a thermal-efficient precast concrete sandwich wall (PCS wall) for engineering utilization and investigate its thermal performance under the conditions of steady heat conduction using experimental tests and finite element analysis. The innovative precast concrete sandwich wall was incorporated with a double-layer insulation system (PCS-DLI wall) which consisted of autoclaved aerated concrete (AAC) board and polyurethane (PU) insulation layer. In the experimental program, twelve PCS-DLI specimens were tested using the calibrated hot box method. The tested parameters included the insulation layer thickness, concrete type, steel material property, and connector number. In the modeling program, 3D nonlinear finite element models of the PCS-DLI walls were built and validated against the test results. Subsequently, the validated models were further utilized to analyze the heat-transferring mechanism of the PCS-DLI wall and conduct parametric studies that evaluated the effects of critical structural parameters on the thermal performance of the PCS-DLI wall. The results indicated that the PCS-DLI wall incorporating AAC board and stainless-steel connections exhibited superior thermal performance with a significant decrease in thermal transmittance in comparison to traditional PCS wall with lightweight aggregate concrete panels with carbon steel connectors. In addition, the utilization of AAC board as the inner wall effectively improved the thermal performance of the PCS wall and mitigate the effects of thermal bridges among the connectors. The optimization analysis was also performed to achieve the desired thermal performance of the PCS-DLI wall while minimizing the insulation layer thickness and connector number. The thermal transmittance of the PCS-DLI wall was 0.241 W/(m<sup>2</sup>·K), which was significantly less than the traditional PCS wall. These results provided design and application suggestions for the innovative PCS-DLI wall in diverse climatic regions.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140785"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neodymium magnets for orientation of steel fibers in concrete: Physical properties, mechanical behavior and image analysis

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials

Pub Date : 2025-03-18 DOI: 10.1016/j.conbuildmat.2025.140872

Jorge Alexandre Petryszin Montebunhuli , Dimas Alan Strauss Rambo , Ramoel Serafini , Renan Pícolo Salvador , Flávio de Andrade Silva

This study explores how the magnetic orientation of steel fibers influences the physical and mechanical properties of a steel fiber reinforced concrete beam. A set of neodymium magnets coupled to a robotic arm was used to guide the metallic fiber reinforcement within the coarse cementitious matrix. Radiographies of portions of the specimens were used to access the fiber distribution across the hardened specimens. The physical properties were assessed through electrical resistivity, while mechanical behavior was evaluated by compression and three-point bending tests. Fiber counting was used to assess the influence of the notching process on the amount of reinforcement present in the fractured sections of the beams in both random and oriented conditions. Results showed that it is possible to optimize the spatial arrangement of macro metallic fibers in concretes containing coarse aggregates. The orientation of the reinforcement resulted in a decrease in electrical resistivity along the magnets' displacement axis (>80 % average reduction at the base of the prisms). Composites with oriented reinforcement showed on average 24 % more fibers crossing the fractured region than random ones. Furthermore, specimens with oriented fibers exhibited, in general, improved flexural performance and toughness compared to those with random reinforcement. This research highlights a novel approach that can enhance the efficiency and sustainability of steel fiber-reinforced concrete applications.

{"title":"Neodymium magnets for orientation of steel fibers in concrete: Physical properties, mechanical behavior and image analysis","authors":"Jorge Alexandre Petryszin Montebunhuli , Dimas Alan Strauss Rambo , Ramoel Serafini , Renan Pícolo Salvador , Flávio de Andrade Silva","doi":"10.1016/j.conbuildmat.2025.140872","DOIUrl":"10.1016/j.conbuildmat.2025.140872","url":null,"abstract":"<div><div>This study explores how the magnetic orientation of steel fibers influences the physical and mechanical properties of a steel fiber reinforced concrete beam. A set of neodymium magnets coupled to a robotic arm was used to guide the metallic fiber reinforcement within the coarse cementitious matrix. Radiographies of portions of the specimens were used to access the fiber distribution across the hardened specimens. The physical properties were assessed through electrical resistivity, while mechanical behavior was evaluated by compression and three-point bending tests. Fiber counting was used to assess the influence of the notching process on the amount of reinforcement present in the fractured sections of the beams in both random and oriented conditions. Results showed that it is possible to optimize the spatial arrangement of macro metallic fibers in concretes containing coarse aggregates. The orientation of the reinforcement resulted in a decrease in electrical resistivity along the magnets' displacement axis (>80 % average reduction at the base of the prisms). Composites with oriented reinforcement showed on average 24 % more fibers crossing the fractured region than random ones. Furthermore, specimens with oriented fibers exhibited, in general, improved flexural performance and toughness compared to those with random reinforcement. This research highlights a novel approach that can enhance the efficiency and sustainability of steel fiber-reinforced concrete applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140872"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0