Construction and Building Materials最新文献_第2页

Dissolution of CaO-SiO2-Al2O3 glasses modified by Mn in alkaline conditions

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.2025.140837

Qiang Liu , Meng Wu , Guowen Sun , Jianming Gao , Yunsheng Zhang , Cheng Liu

Non-ferrous metallurgical slags (NFM slag) containing heavy metals have been used as supplementary cementitious materials in the cement concrete industry. The NFM slag pozzolanic reaction is highly dependent on the reactivity of the aluminosilicate glass phase, while the effect of heavy metal introduced during high-temperature smelting on the structural feature and dissolution process of aluminosilicate glass in NFM slag remains unclear. In this study, the synthetic CaO-SiO₂-Al₂O₃ glasses based on the chemical compositions of common NFM slag are prepared to investigate the influence of Mn on the glass structure and dissolution activity. The results reveal that the incorporation of Mn into the glass structure was depolymerized by increasing the amount of non-bridging oxygen due to Mn as the network modifier and intermediate in the glass structure. Compared with non-modified glasses, the Mn-modified ones exhibit higher aluminum and silicon ion dissolution rates. The increasing non-bridging oxygen of glass modified by Mn can promote the dissolution-precipitation balance in the early stage. The precipitation layer was observed at approximately 20 nm thickness on the particle’s surface. Furthermore, the addition of Mn reduces the activation energy required for the dissolution of Al and Si, which could be used to indicate the different reactivity under different dissolution temperatures. This study provides dissolution-precipitation insights into the interaction between glass structure and dissolution process in the presence of Mn, contributing to the effective utilization of SCMs containing heavy metals in construction materials.

{"title":"Dissolution of CaO-SiO2-Al2O3 glasses modified by Mn in alkaline conditions","authors":"Qiang Liu , Meng Wu , Guowen Sun , Jianming Gao , Yunsheng Zhang , Cheng Liu","doi":"10.1016/j.conbuildmat.2025.140837","DOIUrl":"10.1016/j.conbuildmat.2025.140837","url":null,"abstract":"<div><div>Non-ferrous metallurgical slags (NFM slag) containing heavy metals have been used as supplementary cementitious materials in the cement concrete industry. The NFM slag pozzolanic reaction is highly dependent on the reactivity of the aluminosilicate glass phase, while the effect of heavy metal introduced during high-temperature smelting on the structural feature and dissolution process of aluminosilicate glass in NFM slag remains unclear. In this study, the synthetic CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> glasses based on the chemical compositions of common NFM slag are prepared to investigate the influence of Mn on the glass structure and dissolution activity. The results reveal that the incorporation of Mn into the glass structure was depolymerized by increasing the amount of non-bridging oxygen due to Mn as the network modifier and intermediate in the glass structure. Compared with non-modified glasses, the Mn-modified ones exhibit higher aluminum and silicon ion dissolution rates. The increasing non-bridging oxygen of glass modified by Mn can promote the dissolution-precipitation balance in the early stage. The precipitation layer was observed at approximately 20 nm thickness on the particle’s surface. Furthermore, the addition of Mn reduces the activation energy required for the dissolution of Al and Si, which could be used to indicate the different reactivity under different dissolution temperatures. This study provides dissolution-precipitation insights into the interaction between glass structure and dissolution process in the presence of Mn, contributing to the effective utilization of SCMs containing heavy metals in construction materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140837"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641988","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

Nonlinear analytical solutions for predicting the debonding process of the EBROG FRP-concrete bond

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.2025.140783

Khaled Sanginabadi , Azad Yazdani , Davood Mostofinejad

Fiber-reinforced polymer (FRP) composites are frequently employed to strengthen reinforced concrete members. The FRP-to-concrete bond established through the externally bonded reinforcement (EBR) technique has consistently been challenging due to the premature debonding of the FRP composite. The debonding process of FRP composites has been significantly postponed due to the implementation of a novel technique known as externally bonded reinforcement on grooves (EBROG) in recent years. Several experimental studies have been conducted to understand the behavior of the EBROG bond. However, a dearth of analytical research has been continued in this field, and closed-form analytical models have not yet been developed. Therefore, this study employs the definition of a nonlinear shear stress-slip relationship to generate and develop analytical models to evaluate the debonding process of the EBROG bond. The presented models have the capability to predict the behavior of the EBROG bond from the start of loading until the final moment of loading. The models' high accuracy is demonstrated by comparing their estimations with the experimental results on longitudinal profiles, load-slip curves, and bond strength. The bond strength model predicts the bond resistance for 90 % of the specimens with an error of less than 20 %. Also, the effect of increasing the number of grooves on the strength and behavior of the EBROG bond is much more pronounced than the effect of increasing the dimensions of the grooves, which is one of the key findings of the parametric study.

{"title":"Nonlinear analytical solutions for predicting the debonding process of the EBROG FRP-concrete bond","authors":"Khaled Sanginabadi , Azad Yazdani , Davood Mostofinejad","doi":"10.1016/j.conbuildmat.2025.140783","DOIUrl":"10.1016/j.conbuildmat.2025.140783","url":null,"abstract":"<div><div>Fiber-reinforced polymer (FRP) composites are frequently employed to strengthen reinforced concrete members. The FRP-to-concrete bond established through the externally bonded reinforcement (EBR) technique has consistently been challenging due to the premature debonding of the FRP composite. The debonding process of FRP composites has been significantly postponed due to the implementation of a novel technique known as externally bonded reinforcement on grooves (EBROG) in recent years. Several experimental studies have been conducted to understand the behavior of the EBROG bond. However, a dearth of analytical research has been continued in this field, and closed-form analytical models have not yet been developed. Therefore, this study employs the definition of a nonlinear shear stress-slip relationship to generate and develop analytical models to evaluate the debonding process of the EBROG bond. The presented models have the capability to predict the behavior of the EBROG bond from the start of loading until the final moment of loading. The models' high accuracy is demonstrated by comparing their estimations with the experimental results on longitudinal profiles, load-slip curves, and bond strength. The bond strength model predicts the bond resistance for 90 % of the specimens with an error of less than 20 %. Also, the effect of increasing the number of grooves on the strength and behavior of the EBROG bond is much more pronounced than the effect of increasing the dimensions of the grooves, which is one of the key findings of the parametric study.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140783"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641979","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 the properties and mechanism of a fiber-reinforced alkali-activated lithium slag artificial lightweight aggregate

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.2025.140866

Xianliang Zhou , Zhaopeng Tang , Yantao Zheng , Yingda Zhang , Fan Wu

Lithium slag (LS), a by product of the rapidly expanding new energy industry, poses challenges in terms of environmental pollution, disposal difficulties, and high disposal costs. To achieve efficient, low-cost, and eco-friendly utilization of LS in the construction material field, this study examines the LS artificial lightweight aggregate (ALWA) produced by the cold-bonded method. The mass ratio of LS to granulated blast furnace slag (GBFS) in the aggregate is 7:3. Polyvinyl alcohol (PVA) fibers are used to modify the aggregates at various dosages. Macroscopic tests and microscopic characterizations are conducted to investigate the basic physical and mechanical properties and formation mechanisms of the aggregate. The results indicate that under the action of an alkali activator with a modulus of 1.5, high-quality ALWA with a density grade of 1000 and a compressive strength of 6.9 MPa is successfully prepared. Furthermore, a 0.1 % fiber dosage reduces the 28-day cylinder compressive strength of the aggregate due to the introduction of more macropores. An increased forming difficulty is observed at a 0.3 % fiber dosage. As the optimal dosage, 0.2 % fiber content decreases the aggregate density grade to 900 and increases the 28-day strength to 7.4 MPa, meeting the Chinese Standard (GB/T 17,431.1–2010) for high-strength lightweight aggregates. The microscopic results reveal that the reactive components in LS and GBFS participate in the reaction to form a geopolymer gel (N(C)-A-S-H), resulting in a dense aggregate structure. The aggregates without fibers have a porosity of less than 200 nm, accounting for up to 94.49 % of the aggregates. Although the addition of fibers physically increases the porosity of the aggregate, their bridging effect still optimizes the mechanical properties of the aggregate, especially in terms of early strength.

{"title":"Research on the properties and mechanism of a fiber-reinforced alkali-activated lithium slag artificial lightweight aggregate","authors":"Xianliang Zhou , Zhaopeng Tang , Yantao Zheng , Yingda Zhang , Fan Wu","doi":"10.1016/j.conbuildmat.2025.140866","DOIUrl":"10.1016/j.conbuildmat.2025.140866","url":null,"abstract":"<div><div>Lithium slag (LS), a by product of the rapidly expanding new energy industry, poses challenges in terms of environmental pollution, disposal difficulties, and high disposal costs. To achieve efficient, low-cost, and eco-friendly utilization of LS in the construction material field, this study examines the LS artificial lightweight aggregate (ALWA) produced by the cold-bonded method. The mass ratio of LS to granulated blast furnace slag (GBFS) in the aggregate is 7:3. Polyvinyl alcohol (PVA) fibers are used to modify the aggregates at various dosages. Macroscopic tests and microscopic characterizations are conducted to investigate the basic physical and mechanical properties and formation mechanisms of the aggregate. The results indicate that under the action of an alkali activator with a modulus of 1.5, high-quality ALWA with a density grade of 1000 and a compressive strength of 6.9 MPa is successfully prepared. Furthermore, a 0.1 % fiber dosage reduces the 28-day cylinder compressive strength of the aggregate due to the introduction of more macropores. An increased forming difficulty is observed at a 0.3 % fiber dosage. As the optimal dosage, 0.2 % fiber content decreases the aggregate density grade to 900 and increases the 28-day strength to 7.4 MPa, meeting the Chinese Standard (GB/T 17,431.1–2010) for high-strength lightweight aggregates. The microscopic results reveal that the reactive components in LS and GBFS participate in the reaction to form a geopolymer gel (N(C)-A-S-H), resulting in a dense aggregate structure. The aggregates without fibers have a porosity of less than 200 nm, accounting for up to 94.49 % of the aggregates. Although the addition of fibers physically increases the porosity of the aggregate, their bridging effect still optimizes the mechanical properties of the aggregate, especially in terms of early strength.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140866"},"PeriodicalIF":7.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143641980","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

Spheres prepared by air-quenching of the blast furnace titanium slag melts and its secondary thermal treatment

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140851

Kai Zhou , Jun Li , Zixin Xu , Chen Xu , Li Hou , Zhongyuan Lu , Jie Zhao , Bin Wang , Fengyuan Yang

Considerable blast furnace titanium slags (BFTS) are generated during the V-Ti magnetite smelting process, which had been low-value utilized as aggregates in construction and building areas. In this study, an air-quenching process was proposed to treat BFTS melts directly to obtain spherical BFTS particles. The obtained BFTS spheres (ATS) were sieved into 16–30 mesh (S1), 40–70 mesh (S2) and 70–140 mesh (S3). The morphological parameters (including roundness and sphericity), mineral and chemical compositions of all ATSs were determined by image analysis, scanning emission microscopes (SEM), X-ray fluorescence spectrometry (XRF), and X-ray diffraction (XRD), etc. While their properties were also measured experimentally. It is concluded that all ATSs have a smooth spherical shape with relatively higher sphericity and roundness. ATSs exhibit a better close packing and lower water absorptions as compared with raw BFTS. ATS S3 showed relatively lower acid solubility and excellent crushing resistance as compared with those of ATS S1 and ATS S2. A secondary thermal treatment method is proposed to further improve the acid solubility and crushing resistance of ATSs. Glass phases in ATSs are transformed into crystalline phases, thus improved the acid solubility and crushing resistance of the ATS samples, excluding the crushing resistance of ATS S3. It is expected that the preparation of ATS through air-quenching and the consequent secondary thermal treatment was one of the most proper way in the treatment and high-value utilization of BFTS. And the obtained ATS can be used as a special and functional high-performance aggregate/filler in the construction field or others.

{"title":"Spheres prepared by air-quenching of the blast furnace titanium slag melts and its secondary thermal treatment","authors":"Kai Zhou , Jun Li , Zixin Xu , Chen Xu , Li Hou , Zhongyuan Lu , Jie Zhao , Bin Wang , Fengyuan Yang","doi":"10.1016/j.conbuildmat.2025.140851","DOIUrl":"10.1016/j.conbuildmat.2025.140851","url":null,"abstract":"<div><div>Considerable blast furnace titanium slags (BFTS) are generated during the V-Ti magnetite smelting process, which had been low-value utilized as aggregates in construction and building areas. In this study, an air-quenching process was proposed to treat BFTS melts directly to obtain spherical BFTS particles. The obtained BFTS spheres (ATS) were sieved into 16–30 mesh (S1), 40–70 mesh (S2) and 70–140 mesh (S3). The morphological parameters (including roundness and sphericity), mineral and chemical compositions of all ATSs were determined by image analysis, scanning emission microscopes (SEM), X-ray fluorescence spectrometry (XRF), and X-ray diffraction (XRD), etc. While their properties were also measured experimentally. It is concluded that all ATSs have a smooth spherical shape with relatively higher sphericity and roundness. ATSs exhibit a better close packing and lower water absorptions as compared with raw BFTS. ATS S3 showed relatively lower acid solubility and excellent crushing resistance as compared with those of ATS S1 and ATS S2. A secondary thermal treatment method is proposed to further improve the acid solubility and crushing resistance of ATSs. Glass phases in ATSs are transformed into crystalline phases, thus improved the acid solubility and crushing resistance of the ATS samples, excluding the crushing resistance of ATS S3. It is expected that the preparation of ATS through air-quenching and the consequent secondary thermal treatment was one of the most proper way in the treatment and high-value utilization of BFTS. And the obtained ATS can be used as a special and functional high-performance aggregate/filler in the construction field or others.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140851"},"PeriodicalIF":7.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631781","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

Experimental research and theoretical calculation of the shear performance of the MPCC-NC interface MPCC-NC 界面剪切性能的实验研究和理论计算

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140789

Fangwen Wu, Lanqing He, Ao Chen, Zirun Li, Jincheng Cao, Bitong Zhao, Haipeng Lei

Magnesium phosphate cement concrete (MPCC) has a promising prospect in concrete repairment for its early-strength properties. However, the bonding performance between MPCC and normal concrete (NC) limits the safety of repaired structures; therefore, the study of bonding performance is of great significance for engineering applications. The research topic of this paper is to examine the shear performance of the interface between MPCC and NC with different interface treatment methods. A total of 14 push-off specimens were tested, where the interface treatment methods included the rough interface, the interface with a concrete block, and the interface strengthened with reinforcements. The results reveal that the interface strengthened with reinforcements has the maximum shear capacity, and the shear capacity is mainly controlled by the compressive strength of the localized concrete; the shear capacity of the interface with a concrete block is primarily controlled by the shear ability of the concrete block; the rough interface has the minimum shear capacity, which is mainly controlled by the chemical bonding action. Moreover, the shear calculation methods have been established based on the failure modes of the push-off tests, which has a good prediction effect on the interfacial shear capacity. This research provides a reference for the engineering design of MPCC.

{"title":"Experimental research and theoretical calculation of the shear performance of the MPCC-NC interface","authors":"Fangwen Wu, Lanqing He, Ao Chen, Zirun Li, Jincheng Cao, Bitong Zhao, Haipeng Lei","doi":"10.1016/j.conbuildmat.2025.140789","DOIUrl":"10.1016/j.conbuildmat.2025.140789","url":null,"abstract":"<div><div>Magnesium phosphate cement concrete (MPCC) has a promising prospect in concrete repairment for its early-strength properties. However, the bonding performance between MPCC and normal concrete (NC) limits the safety of repaired structures; therefore, the study of bonding performance is of great significance for engineering applications. The research topic of this paper is to examine the shear performance of the interface between MPCC and NC with different interface treatment methods. A total of 14 push-off specimens were tested, where the interface treatment methods included the rough interface, the interface with a concrete block, and the interface strengthened with reinforcements. The results reveal that the interface strengthened with reinforcements has the maximum shear capacity, and the shear capacity is mainly controlled by the compressive strength of the localized concrete; the shear capacity of the interface with a concrete block is primarily controlled by the shear ability of the concrete block; the rough interface has the minimum shear capacity, which is mainly controlled by the chemical bonding action. Moreover, the shear calculation methods have been established based on the failure modes of the push-off tests, which has a good prediction effect on the interfacial shear capacity. This research provides a reference for the engineering design of MPCC.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140789"},"PeriodicalIF":7.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631779","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 blending and diffusion phenomena of virgin and aged asphalt during the laboratory-simulated construction stage

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140741

Guilian Zou , Youqing Jiao , Yuan Zhang , Yan Yuan , Jiangmiao Yu , Ao Han

This research aims to quantify the degree of blending (DoB) between virgin and aged asphalt binders in recycled asphalt mixture during construction stage by using the Confocal Laser Scanning Microscopy (CLSM) technology. In this research, virgin SBS-modified binder was employed as a tracer. Wood cube aggregate was used as RAP aggregate to be distinguished from the asphalt mixtures. Various heating temperature and storage time conditions were set up for laboratory-produced recycled asphalt mixtures to simulate different construction stages, including storage, transportation, laying, and compaction processes. The CLSM was utilized to detect fluorescence concentration diffusion of virgin SBS-modified binder on the simulated RAP aggregate samples at each construction stage. A method for quantifying the DoB of virgin and aged asphalt binders was proposed. Results demonstrated that the simulated construction stages have significant impacts on blending efficiency of virgin and aged asphalt binders. After mixing process, the DoB of tested binders was found to be 43.4 %. The DoB values increased 19.7–31.6 % during storage stage range, and 7.2–9.2 % during transport stage. The DoB values only increased 2–4 % during laying and compaction stage. The overall increase of the DoB can be as high as 30 %, indicating that settings of construction stages are crucial for the blending of virgin and aged asphalt binders in recycled asphalt mixtures.

{"title":"Research on blending and diffusion phenomena of virgin and aged asphalt during the laboratory-simulated construction stage","authors":"Guilian Zou , Youqing Jiao , Yuan Zhang , Yan Yuan , Jiangmiao Yu , Ao Han","doi":"10.1016/j.conbuildmat.2025.140741","DOIUrl":"10.1016/j.conbuildmat.2025.140741","url":null,"abstract":"<div><div>This research aims to quantify the degree of blending (DoB) between virgin and aged asphalt binders in recycled asphalt mixture during construction stage by using the Confocal Laser Scanning Microscopy (CLSM) technology. In this research, virgin SBS-modified binder was employed as a tracer. Wood cube aggregate was used as RAP aggregate to be distinguished from the asphalt mixtures. Various heating temperature and storage time conditions were set up for laboratory-produced recycled asphalt mixtures to simulate different construction stages, including storage, transportation, laying, and compaction processes. The CLSM was utilized to detect fluorescence concentration diffusion of virgin SBS-modified binder on the simulated RAP aggregate samples at each construction stage. A method for quantifying the DoB of virgin and aged asphalt binders was proposed. Results demonstrated that the simulated construction stages have significant impacts on blending efficiency of virgin and aged asphalt binders. After mixing process, the DoB of tested binders was found to be 43.4 %. The DoB values increased 19.7–31.6 % during storage stage range, and 7.2–9.2 % during transport stage. The DoB values only increased 2–4 % during laying and compaction stage. The overall increase of the DoB can be as high as 30 %, indicating that settings of construction stages are crucial for the blending of virgin and aged asphalt binders in recycled asphalt mixtures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140741"},"PeriodicalIF":7.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642050","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

The shrinkage crack characteristics of jute fiber-modified clay under wet-dry cycle conditions

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140840

Hong Guo , Wenyang Li , Fang Dang , Ya Wang , Jiangtao Fu , Mingjiang Tao

The development pattern of shrinkage cracks in sandy clay under dry wet cycling conditions is relatively complex. This study employed indoor experiments and image analysis methods to explore the inhibition mechanism of jute fiber on drying shrinkage cracks in sandy clay under dry wet cycling conditions. The results demonstrated that the jute fiber effectively inhibits crack propagation through friction, overlap, and anchoring mechanisms. Notably, increasing the fiber content can considerably reduce soil crack rate and crack width and promote the micro crack formation. The water absorption capability of jute fiber helps to evenly distribute water in the soil, thereby slowing down the evaporation rate and limiting crack formation. For instance, the addition of 0.6 % jute fiber led to a decrease in its crack rate and average crack width by 15.4 % and 53.3 %, respectively, compared to pure clay. Furthermore, after 5 cycles of wet-dry cycles, the crack rate and average crack width of sandy clay with different dosages decreased by 65–80 % and 69–75 %, respectively. This study provides a theoretical basis and technical support for incorporating jute fiber in clay improvement, which is immensely significant for enhancing the durability and stability of clay in engineering applications.

{"title":"The shrinkage crack characteristics of jute fiber-modified clay under wet-dry cycle conditions","authors":"Hong Guo , Wenyang Li , Fang Dang , Ya Wang , Jiangtao Fu , Mingjiang Tao","doi":"10.1016/j.conbuildmat.2025.140840","DOIUrl":"10.1016/j.conbuildmat.2025.140840","url":null,"abstract":"<div><div>The development pattern of shrinkage cracks in sandy clay under dry wet cycling conditions is relatively complex. This study employed indoor experiments and image analysis methods to explore the inhibition mechanism of jute fiber on drying shrinkage cracks in sandy clay under dry wet cycling conditions. The results demonstrated that the jute fiber effectively inhibits crack propagation through friction, overlap, and anchoring mechanisms. Notably, increasing the fiber content can considerably reduce soil crack rate and crack width and promote the micro crack formation. The water absorption capability of jute fiber helps to evenly distribute water in the soil, thereby slowing down the evaporation rate and limiting crack formation. For instance, the addition of 0.6 % jute fiber led to a decrease in its crack rate and average crack width by 15.4 % and 53.3 %, respectively, compared to pure clay. Furthermore, after 5 cycles of wet-dry cycles, the crack rate and average crack width of sandy clay with different dosages decreased by 65–80 % and 69–75 %, respectively. This study provides a theoretical basis and technical support for incorporating jute fiber in clay improvement, which is immensely significant for enhancing the durability and stability of clay in engineering applications.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"472 ","pages":"Article 140840"},"PeriodicalIF":7.4,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631782","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

Push-out tests and theoretical models of steel-UHPC composite members considering interfacial bonding strength 考虑界面粘接强度的钢-UHPC 复合材料构件的挤出试验和理论模型

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140856

Youzhu Lin , Mengqi Cao , Xinya Mao , Mingyang Feng , Ming Sun

Recently, ultra-high performance concrete (UHPC) has been incorporated into steel-concrete (SC) composite structures, where the mechanical behaviors at their interfaces play a crucial role in the overall stability. Previous research often overlooks the importance of bonding strength between steel and concrete. To address this gap, this paper introduces a novel test method to measure bonding strength. Twelve push-out specimens were tested to evaluate their mechanical behaviors and failure modes. Three distinct failure modes were identified: concrete cracking failure, connector fracture failure, and a combination of both. The results show that UHPC significantly alters failure modes, shifting from concrete cracking to connector fracture. It also improves shear capacity, increases ductility, and reduces the initial slip modulus. Notably, the bonding strength at the interface contributes to 30 %-40 % of the shear capacity. Finite element models were developed and validated against experimental results. This combination of testing and simulation reveals the influence of UHPC, interfacial bonding strength, and different shear connectors on the structural behavior. Additionally, a parametric study was performed to determine the damage length of concrete near shear connectors, aiding in the development of a theoretical model. Consequently, theoretical models for predicting shear capacity at the steel-concrete interface were developed, specifically considering the interfacial bonding strength. The accuracy of these models has been validated, confirming the applicability in practical engineering design.

最近，超高性能混凝土（UHPC）被应用到钢-混凝土（SC）复合结构中，其界面的力学行为对整体稳定性起着至关重要的作用。以往的研究往往忽视了钢与混凝土之间粘结强度的重要性。为了弥补这一不足，本文介绍了一种测量粘结强度的新型测试方法。对 12 个推出试样进行了测试，以评估其力学行为和破坏模式。确定了三种不同的失效模式：混凝土开裂失效、连接件断裂失效以及两者的结合。结果表明，超高性能混凝土大大改变了破坏模式，从混凝土开裂转变为连接器断裂。它还提高了抗剪能力，增加了延展性，降低了初始滑移模量。值得注意的是，界面处的粘结强度占剪切能力的 30%-40% 。我们开发了有限元模型，并根据实验结果进行了验证。测试与模拟的结合揭示了超高性能混凝土、界面粘结强度和不同剪切连接件对结构行为的影响。此外，还进行了参数研究，以确定剪力连接件附近混凝土的破坏长度，从而有助于理论模型的开发。因此，开发了预测钢-混凝土界面抗剪能力的理论模型，特别是考虑了界面粘接强度。这些模型的准确性已得到验证，证实了其在实际工程设计中的适用性。

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引用次数: 0

Evaluating the impact of nano-silica particle size on pozzolanic reaction kinetics, mechanical strength and durability of portland slag cement

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140784

Jun Xu , Yali Li , Haiting Su , Huichen Xu , Laibo Li , Lingchao Lu

Theoretically, incorporating Nano-silica (NS) into cement-based composites enhances their mechanical properties and durability in marine environment by virtue of nucleation effect, pozzolanic effect and filling effect. However, an investigation on the precise effect of NS particle sizes on PSC performance is lacking. In this paper, the relationship between NS particle size on the reaction kinetics and the mechanical strength and durability of Portland slag cement (PSC) were delved. The reaction kinetics results demonstrated that NS15 displayed the highest pozzolanic activity, but its practical benefits were limited due to the compromised workability of the PSC-NS15. NS30, with its high pozzolanic activity and low rheological effect, showed the best improvement effect on the mechanical properties and durability of PSC. Significantly, compared to the blank sample, PSC-NS30 exhibited a 13.11 % and 8.24 % increase in compressive strength after 3 and 28 days, respectively. Moreover, a notable reduction of 21.64 % in porosity and 12.34 % in chloride diffusion coefficient was observed in PSC-NS30 at 28 days. These findings provide valuable theoretical insights for the judicious selection of NS in marine engineering applications.

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引用次数: 0

Development of a sustainable slow-release de-icing additive for asphalt pavements using lignin fiber

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

Construction and Building Materials

Pub Date : 2025-03-17 DOI: 10.1016/j.conbuildmat.2025.140778

Chao Peng , Yunfei Ning , Zhanping You , Qifang Yin , Peiwen Guan , Dongjin Yang , Di Ruan , Zhile Ye , Sijia Liu , Ruihua Ji

In cold weather, ice on asphalt pavements can lead to slippery surfaces, increasing the risk of vehicle accidents and posing threats to human safety. This study selects lignin fiber (LF) as a carrier to prepare a new de-icing additive. A slow-release de-icing emulsified asphalt fog seal (SDFS) was formulated with this additive and emulsified asphalt. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) confirmed that LF effectively adsorbed HCOONa, with the sodium content on the fiber surface increasing from 0.91 % to 5.64 % after adsorption. The experiments demonstrated that SDFS can delay the freezing time of water by approximately 50 % and lower the freezing point of water on the road surface. De-icing experiments showed that after 8 impacts, the de-icing rate of the Marshall specimen coated with SDFS reached 91.52 %, whereas the common Marshall specimen had a de-icing rate of only 38.35 % after the same number of impacts. The abrasion experiments showed that SDFS meets the requirements for road surface applications and retains its de-icing capability even after abrasion. Furthermore, molecular dynamics simulations were employed in this study to demonstrate that salt ions delay freezing by inhibiting the formation and growth of ice nuclei in the solution. In conclusion, SDFS can effectively prevent icing on asphalt pavements and offers good performance for road use.

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引用次数: 0