Pub Date : 2023-06-06DOI: 10.1080/21650373.2023.2219263
Zhidan Rong, Yali Wang, Maopeng Jiao
Good workability and mechanical properties are both important for ultra-high performance cement-based composites (UHPCC). To achieve this goal, UHPCC was produced through a cost-effective approach of substituting cement with mineral admixtures. Based on Modified Andreasen and Andersen grading (MAA) model and orthogonal experimental design, key factors were identified and analyzed. The effect of the sand-to-binder ratio on bulk packing density was examined, while the impact of water-to-binder ratio and sand-to-binder ratio on the workability and mechanical properties of UHPCC was systematically studied. Additionally, X-CT was utilized to quantitatively analyze the steel fiber distribution and mesoscopic pore structure of UHPCC. Results indicated that the sand-to-binder ratio had the significant effect on bulk density, with the optimal ratio being 1.25. The suitable fluidity of UHPCC was between 245–255mm, with an optimal water-to-binder ratio of 0.18. The compressive and flexural strength of the mortar prepared with the optimal parameters were 167.5 MPa and 41.2 MPa, respectively.
对于超高性能水泥基复合材料(UHPCC)来说，良好的可加工性和力学性能是非常重要的。为了实现这一目标，UHPCC是通过用矿物外加剂替代水泥的一种经济有效的方法生产出来的。基于修正Andreasen and Andersen分级(MAA)模型和正交试验设计，对关键因素进行了识别和分析。考察了砂胶比对堆积密度的影响，系统研究了水胶比和砂胶比对UHPCC和易性和力学性能的影响。此外，利用X-CT定量分析了UHPCC的钢纤维分布和介观孔隙结构。结果表明，砂胶比对堆积密度影响显著，最佳配比为1.25。UHPCC的适宜流动性为245 ~ 255mm，最佳水胶比为0.18。采用最优参数制备的砂浆抗压强度为167.5 MPa，抗折强度为41.2 MPa。
{"title":"Optimization design and microstructure analysis of ultra-high performance cement-based composites","authors":"Zhidan Rong, Yali Wang, Maopeng Jiao","doi":"10.1080/21650373.2023.2219263","DOIUrl":"https://doi.org/10.1080/21650373.2023.2219263","url":null,"abstract":"Good workability and mechanical properties are both important for ultra-high performance cement-based composites (UHPCC). To achieve this goal, UHPCC was produced through a cost-effective approach of substituting cement with mineral admixtures. Based on Modified Andreasen and Andersen grading (MAA) model and orthogonal experimental design, key factors were identified and analyzed. The effect of the sand-to-binder ratio on bulk packing density was examined, while the impact of water-to-binder ratio and sand-to-binder ratio on the workability and mechanical properties of UHPCC was systematically studied. Additionally, X-CT was utilized to quantitatively analyze the steel fiber distribution and mesoscopic pore structure of UHPCC. Results indicated that the sand-to-binder ratio had the significant effect on bulk density, with the optimal ratio being 1.25. The suitable fluidity of UHPCC was between 245–255mm, with an optimal water-to-binder ratio of 0.18. The compressive and flexural strength of the mortar prepared with the optimal parameters were 167.5 MPa and 41.2 MPa, respectively.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1376 - 1386"},"PeriodicalIF":4.4,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45082430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-05DOI: 10.1080/21650373.2023.2219251
Weihuan Li, Yang Zhou, Li Ding, Pengfei Lv, Yifan Su, Rui Wang, Changwen Miao
Machine learning potential is an emerging and powerful approach with which to address the challenges of achieving both accuracy and efficiency in molecular dynamics simulations. However, the development of machine learning potentials necessitates intricate construction of descriptors, particularly for complex material systems. Therefore, the Deep Potential method, which utilizes artificial neural networks to autonomously construct descriptors, are employed to develop a deep learning-based potential for calcium silicate hydrates (the basic building block of cement-based materials) in this study. The accuracy of this potential is validated through calculations of energetics, structural, and elastic properties, demonstrating alignment with first principle calculations and an efficiency 2–3 orders of magnitude higher. Additionally, the deep potential successfully reproduces precise predictions in C-S-H models with different calcium-to-silicon ratios, thereby confirming its remarkable transferability. This potential is expected to fulfill cross-scale computations and bottom-up design of cement-based materials with both high accuracy and efficiency.
{"title":"A deep learning-based potential developed for calcium silicate hydrates with both high accuracy and efficiency","authors":"Weihuan Li, Yang Zhou, Li Ding, Pengfei Lv, Yifan Su, Rui Wang, Changwen Miao","doi":"10.1080/21650373.2023.2219251","DOIUrl":"https://doi.org/10.1080/21650373.2023.2219251","url":null,"abstract":"Machine learning potential is an emerging and powerful approach with which to address the challenges of achieving both accuracy and efficiency in molecular dynamics simulations. However, the development of machine learning potentials necessitates intricate construction of descriptors, particularly for complex material systems. Therefore, the Deep Potential method, which utilizes artificial neural networks to autonomously construct descriptors, are employed to develop a deep learning-based potential for calcium silicate hydrates (the basic building block of cement-based materials) in this study. The accuracy of this potential is validated through calculations of energetics, structural, and elastic properties, demonstrating alignment with first principle calculations and an efficiency 2–3 orders of magnitude higher. Additionally, the deep potential successfully reproduces precise predictions in C-S-H models with different calcium-to-silicon ratios, thereby confirming its remarkable transferability. This potential is expected to fulfill cross-scale computations and bottom-up design of cement-based materials with both high accuracy and efficiency.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135703531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-05DOI: 10.1080/21650373.2023.2219253
Yue Zhang, L. Lei, J. Plank, Liugang Chen
This study focused on investigating the dispersing effectiveness of polycarboxylate (PCE) superplasticizers with different carboxylate groups in two binder systems: Alkali-activated Slag (AAS) and Ordinary Portland Cement (OPC). Two α-allyl-ω-hydroxy poly (ethylene glycol) ether (APEG) PCE copolymers were prepared from acrylic acid (AA) or maleic anhydride (MA) separately. Performance test results in AAS revealed that MA-7APEG polymer exhibited much stronger dispersing efficiency than AA-7APEG2, despite both PCE polymers having the same anionicity and comparable molecular weight. This difference in effectiveness can be attributed to the stronger calcium binding capacity of the MA-7APEG polymer, as determined through anionic charge measurements and potential titration analysis. The study highlights the importance of considering the properties of the carboxylate groups in the design of effective PCE superplasticizers for use in different binder systems.
{"title":"Boosting the performance of low-carbon alkali activated slag with APEG PCEs: a comparison with ordinary Portland cement","authors":"Yue Zhang, L. Lei, J. Plank, Liugang Chen","doi":"10.1080/21650373.2023.2219253","DOIUrl":"https://doi.org/10.1080/21650373.2023.2219253","url":null,"abstract":"This study focused on investigating the dispersing effectiveness of polycarboxylate (PCE) superplasticizers with different carboxylate groups in two binder systems: Alkali-activated Slag (AAS) and Ordinary Portland Cement (OPC). Two α-allyl-ω-hydroxy poly (ethylene glycol) ether (APEG) PCE copolymers were prepared from acrylic acid (AA) or maleic anhydride (MA) separately. Performance test results in AAS revealed that MA-7APEG polymer exhibited much stronger dispersing efficiency than AA-7APEG2, despite both PCE polymers having the same anionicity and comparable molecular weight. This difference in effectiveness can be attributed to the stronger calcium binding capacity of the MA-7APEG polymer, as determined through anionic charge measurements and potential titration analysis. The study highlights the importance of considering the properties of the carboxylate groups in the design of effective PCE superplasticizers for use in different binder systems.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1347 - 1359"},"PeriodicalIF":4.4,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45121412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-04DOI: 10.1080/21650373.2023.2218841
M. Cao, Honglei Zhang
This paper investigated the fractal characteristics of particle groups and the mechanochemical effects of mechanically grinding Yellow River Sediment (MGYRS). The particle groups of MGYRS had good fractal characteristics, and the fractal dimension had a better correlation with the particle size, distribution and specific surface area of MGYRS, which could well reflect the changes in the physical properties of MGYRS. After mechanical milling, the analysis by XRD, FT-IR and XPS microscopic tests revealed that: the crystallinity and grain size of mineral crystals in MGYRS decreased with the increase in milling time. The electron binding energy of Si2p, Al2p and O1s shifted to the low-energy direction, and the chemical valence state of silicon atoms appeared Si3+ due to the breakage of the Si-O-Si/Al chemical bond. These changes in internal structure and chemical valence state were the microscopic manifestations of mechanochemical effects. The activation rate of MGYRS increased with the increase of grinding time, which was the macroscopic manifestation of mechanochemical effects.
{"title":"Fractal characteristics of particle groups and mechanochemical effects of Yellow River sediment after mechanical grinding","authors":"M. Cao, Honglei Zhang","doi":"10.1080/21650373.2023.2218841","DOIUrl":"https://doi.org/10.1080/21650373.2023.2218841","url":null,"abstract":"This paper investigated the fractal characteristics of particle groups and the mechanochemical effects of mechanically grinding Yellow River Sediment (MGYRS). The particle groups of MGYRS had good fractal characteristics, and the fractal dimension had a better correlation with the particle size, distribution and specific surface area of MGYRS, which could well reflect the changes in the physical properties of MGYRS. After mechanical milling, the analysis by XRD, FT-IR and XPS microscopic tests revealed that: the crystallinity and grain size of mineral crystals in MGYRS decreased with the increase in milling time. The electron binding energy of Si2p, Al2p and O1s shifted to the low-energy direction, and the chemical valence state of silicon atoms appeared Si3+ due to the breakage of the Si-O-Si/Al chemical bond. These changes in internal structure and chemical valence state were the microscopic manifestations of mechanochemical effects. The activation rate of MGYRS increased with the increase of grinding time, which was the macroscopic manifestation of mechanochemical effects.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1322 - 1333"},"PeriodicalIF":4.4,"publicationDate":"2023-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41685264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Using recycled brick powder (RBP) in blended cement is beneficial to energy saving and emission reduction. The hydration process of blended cement containing RBP is significant for the mechanical property and durability of concrete. The hydration mechanism of blended cement containing recycled brick powder (RBP) has been investigated through hydration heat, hydration degree, and hydration products of the pastes to reveal the effect of RBP on hydration and the reaction mechanism of RBP. The results show that the addition of RBP reduces the heat release during the hydration process, but its nucleation and dilution effects promote cement hydration. The inclusion of RBP also decreases the amount of Ca(OH)2 in the system. The content of the amorphous phase in the system continuously increases with hydration time, and after 28 days of hydration, the amorphous phase is derived from both cement hydration and the pozzolanic reaction of RBP. Between 28 and 90 days of hydration, the reactivity of RBP significantly increases.
{"title":"Effect of recycled brick powder on the hydration process of cement paste","authors":"Xu Luo, Shujun Li, Zhenhai Xu, Zhaoheng Guo, Cheng Liu, Xuemei Chen, Jianming Gao","doi":"10.1080/21650373.2023.2216702","DOIUrl":"https://doi.org/10.1080/21650373.2023.2216702","url":null,"abstract":"Abstract Using recycled brick powder (RBP) in blended cement is beneficial to energy saving and emission reduction. The hydration process of blended cement containing RBP is significant for the mechanical property and durability of concrete. The hydration mechanism of blended cement containing recycled brick powder (RBP) has been investigated through hydration heat, hydration degree, and hydration products of the pastes to reveal the effect of RBP on hydration and the reaction mechanism of RBP. The results show that the addition of RBP reduces the heat release during the hydration process, but its nucleation and dilution effects promote cement hydration. The inclusion of RBP also decreases the amount of Ca(OH)2 in the system. The content of the amorphous phase in the system continuously increases with hydration time, and after 28 days of hydration, the amorphous phase is derived from both cement hydration and the pozzolanic reaction of RBP. Between 28 and 90 days of hydration, the reactivity of RBP significantly increases.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1307 - 1321"},"PeriodicalIF":4.4,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42773337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-31DOI: 10.1080/21650373.2023.2214138
Pakawat Pormmoon, Piyanat Charoenamnuaysuk, C. Jaturapitakkul, P. Chindaprasirt, Weerachart Tangchirapat
This study examines the use of ground bottom ash incorporating fly ash in high performance concrete. A self-compacting concrete was considered in this study as to maximize the properties of high performance concrete. Bottom ash was processed to a fine consistency by oven-drying, sieving, and grinding. Ordinary Portland cement (OPC), sieved and ground bottom ash (GBA), and fly ash (FA) were used for producing high performance concrete at a W/B ratio of 0.27. Replacement of 50% cement by GBA produced 101.0 MPa concrete at 28 days: 21.6% stronger than OPC concrete. The 50% GBA mixture needed a greater quantity of superplasticizer to satisfy slump flow requirements for self-compacting concrete, but that dosage was reduced with a partial replacement of GBA by FA. Elastic moduli of all blended concretes matched OPC concrete. However, the blended concretes experienced much less autogenous shrinkage. Pastes containing GBA and FA have less portlandite than OPC paste. In addition, replacing OPC by GBA–FA substantially reduced cumulative heat evolution.
{"title":"Strength, shrinkage, heat evolution, and microstructure of high performance concrete containing high proportions of ground bottom ash blended with fly ash","authors":"Pakawat Pormmoon, Piyanat Charoenamnuaysuk, C. Jaturapitakkul, P. Chindaprasirt, Weerachart Tangchirapat","doi":"10.1080/21650373.2023.2214138","DOIUrl":"https://doi.org/10.1080/21650373.2023.2214138","url":null,"abstract":"This study examines the use of ground bottom ash incorporating fly ash in high performance concrete. A self-compacting concrete was considered in this study as to maximize the properties of high performance concrete. Bottom ash was processed to a fine consistency by oven-drying, sieving, and grinding. Ordinary Portland cement (OPC), sieved and ground bottom ash (GBA), and fly ash (FA) were used for producing high performance concrete at a W/B ratio of 0.27. Replacement of 50% cement by GBA produced 101.0 MPa concrete at 28 days: 21.6% stronger than OPC concrete. The 50% GBA mixture needed a greater quantity of superplasticizer to satisfy slump flow requirements for self-compacting concrete, but that dosage was reduced with a partial replacement of GBA by FA. Elastic moduli of all blended concretes matched OPC concrete. However, the blended concretes experienced much less autogenous shrinkage. Pastes containing GBA and FA have less portlandite than OPC paste. In addition, replacing OPC by GBA–FA substantially reduced cumulative heat evolution.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1270 - 1285"},"PeriodicalIF":4.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41834744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-31DOI: 10.1080/21650373.2023.2213227
Xiaolu Guo, Shuting Yuan, Xinhao Liu
In this article, the self-healing properties and mechanism of cracked fly ash-based Engineered Geopolymer Composites (FA-EGC) in different environments are studied. Four kinds of environments (air, wet-dry cycles, 20 °C water, and 40 °C water) are chosen to simulate real service environments. The tensile property, ultrasonic pulse velocity, crack characteristic, and water absorption of FA-EGC are measured to evaluate the self-healing properties. The test results show that the existence of water and the increasing of temperature can benefit the self-healing performance of FA-EGC. In addition, the 28-day self-healing products are determined by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) to explore the mechanism of the self-healing in different environments. The results demonstrate that N–A–S–H gels could be the main self-healing products in the air condition. While in the other environments with water, the (N/C)–A–S–H gels would be the primary products.
{"title":"The self-healing properties and mechanism of the cracked fly ash-based engineered geopolymer composites (FA-EGC): effects of water and temperature","authors":"Xiaolu Guo, Shuting Yuan, Xinhao Liu","doi":"10.1080/21650373.2023.2213227","DOIUrl":"https://doi.org/10.1080/21650373.2023.2213227","url":null,"abstract":"In this article, the self-healing properties and mechanism of cracked fly ash-based Engineered Geopolymer Composites (FA-EGC) in different environments are studied. Four kinds of environments (air, wet-dry cycles, 20 °C water, and 40 °C water) are chosen to simulate real service environments. The tensile property, ultrasonic pulse velocity, crack characteristic, and water absorption of FA-EGC are measured to evaluate the self-healing properties. The test results show that the existence of water and the increasing of temperature can benefit the self-healing performance of FA-EGC. In addition, the 28-day self-healing products are determined by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) to explore the mechanism of the self-healing in different environments. The results demonstrate that N–A–S–H gels could be the main self-healing products in the air condition. While in the other environments with water, the (N/C)–A–S–H gels would be the primary products.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1228 - 1241"},"PeriodicalIF":4.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43976467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.1080/21650373.2023.2214135
Chuyuan Wen, D. Shen, Yueyao Luo, Wenting Wang, Ci Liu, Ming Li
Early-age autogenous shrinkage and thermal shrinkage developed in concrete may lead to cracking when the stress induced by restrained shrinkage is higher than the tensile strength of concrete. Early-age tensile creep (TC) of concrete can mitigate the tensile stress generated in concrete induced by restrained shrinkage. Characterizing the TC of concrete at early age is important for cracking resistance evaluation. The early-age autogenous shrinkage and TC of concrete with various proportions of polypropylene (PP) macro fiber (0%, 0.3%, 0.6%, and 0.9%) were investigated utilizing the Temperature Stress Test Machine. Fiber dispersion and the microstructure of concrete mixtures were also analyzed. Test results indicated that PP macro fiber reinforcement led to the improvement of mechanical properties and mitigation of autogenous shrinkage. TC behavior of concrete at early age including TC, TC coefficient, and specific TC decreased with the inclusion of PP macro fiber. A modified model for the prediction of the early-age specific TC of concrete reinforced with PP macro fiber was proposed.
{"title":"Early-age autogenous shrinkage and tensile creep of concrete reinforced with polypropylene macro fiber","authors":"Chuyuan Wen, D. Shen, Yueyao Luo, Wenting Wang, Ci Liu, Ming Li","doi":"10.1080/21650373.2023.2214135","DOIUrl":"https://doi.org/10.1080/21650373.2023.2214135","url":null,"abstract":"Early-age autogenous shrinkage and thermal shrinkage developed in concrete may lead to cracking when the stress induced by restrained shrinkage is higher than the tensile strength of concrete. Early-age tensile creep (TC) of concrete can mitigate the tensile stress generated in concrete induced by restrained shrinkage. Characterizing the TC of concrete at early age is important for cracking resistance evaluation. The early-age autogenous shrinkage and TC of concrete with various proportions of polypropylene (PP) macro fiber (0%, 0.3%, 0.6%, and 0.9%) were investigated utilizing the Temperature Stress Test Machine. Fiber dispersion and the microstructure of concrete mixtures were also analyzed. Test results indicated that PP macro fiber reinforcement led to the improvement of mechanical properties and mitigation of autogenous shrinkage. TC behavior of concrete at early age including TC, TC coefficient, and specific TC decreased with the inclusion of PP macro fiber. A modified model for the prediction of the early-age specific TC of concrete reinforced with PP macro fiber was proposed.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1255 - 1269"},"PeriodicalIF":4.4,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42460913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-26DOI: 10.1080/21650373.2023.2214146
Hussein M. Hamada, Jinyan Shi, S. Yousif, Mohammed S. Al Jawahery, B. Tayeh, G. Jokhio
Recently, nano silica (NS) has gained the attraction of academic researchers and the construction industry because of enhancing the properties of cementitious composites. Although there have been some related reviews, the comprehensiveness and advancedness need to be further improved. This paper is a detailed review of previously conducted studies to explore the influence of NS in cementitious composites for evaluating mechanical properties and durability. The impact of NS on the fresh state, i.e. setting time and workability, and in the hardened state, i.e. compressive, flexural, and split tensile strengths is considered. Besides, the long-term durability is discussed that include permeability, resistance against acid and base attack, abrasion resistance, and carbonation resistance. Furthermore, volume stability and microstructure of concrete with NS are presented. A huge number of studies showed the positive effect of NS with optimized content for improving the concrete properties, while a negative effect was observed with the use of excess NS content. The inclusion of NS in cementitious composites substantially enhances the mechanical properties, durability and microstructure. Meanwhile, better dispersibility is the key to ensure the strengthening effect of NS, which can be improved by changing the morphology/size of NS, optimizing the stirring method, and adding surfactants. Further investigation of the application of NS in special concrete is its development direction, and the effect of NS on the microstructure of main hydration products needs to be further explored.
{"title":"Use of nano-silica in cement-based materials – a comprehensive review","authors":"Hussein M. Hamada, Jinyan Shi, S. Yousif, Mohammed S. Al Jawahery, B. Tayeh, G. Jokhio","doi":"10.1080/21650373.2023.2214146","DOIUrl":"https://doi.org/10.1080/21650373.2023.2214146","url":null,"abstract":"Recently, nano silica (NS) has gained the attraction of academic researchers and the construction industry because of enhancing the properties of cementitious composites. Although there have been some related reviews, the comprehensiveness and advancedness need to be further improved. This paper is a detailed review of previously conducted studies to explore the influence of NS in cementitious composites for evaluating mechanical properties and durability. The impact of NS on the fresh state, i.e. setting time and workability, and in the hardened state, i.e. compressive, flexural, and split tensile strengths is considered. Besides, the long-term durability is discussed that include permeability, resistance against acid and base attack, abrasion resistance, and carbonation resistance. Furthermore, volume stability and microstructure of concrete with NS are presented. A huge number of studies showed the positive effect of NS with optimized content for improving the concrete properties, while a negative effect was observed with the use of excess NS content. The inclusion of NS in cementitious composites substantially enhances the mechanical properties, durability and microstructure. Meanwhile, better dispersibility is the key to ensure the strengthening effect of NS, which can be improved by changing the morphology/size of NS, optimizing the stirring method, and adding surfactants. Further investigation of the application of NS in special concrete is its development direction, and the effect of NS on the microstructure of main hydration products needs to be further explored.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1286 - 1306"},"PeriodicalIF":4.4,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44754070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-24DOI: 10.1080/21650373.2023.2213241
G. Sidhu, Himanshu Guleria, D. Sharma, S. Goyal
This study aims to investigate the influence of accelerated carbonation curing (ACC) on strength and permeation characteristics of pervious concrete. ACC envisaged well for CO2 sequestration in concrete. Pervious concrete is considered to be better recipient for CO2 curing due to presence of high interconnected pores. Carbonation of pervious concrete is deeper and homogeneous in comparison to normal concrete. Experimental results show that accelerated carbonation curing at 12-hour effectively improves strength of pervious concrete. Also, application-based interlocking pervious paver blocks subjected to 12-hour ACC provide the highest strength of 23.36 MPa. Permeation characteristics were found to be in optimum range despite of decrease in permeability due to the formation of CaCO3 in specimens subjected to ACC. Microstructural analysis also suggested intermingled matrix of CaCO3 and CSH gel. TGA revealed higher CO2 uptake for longer duration of ACC specimens, suggesting sequestration of CO2 in pervious concrete compare to conventional concrete.
{"title":"Strength and permeation characteristics of pervious concrete subjected to accelerated carbonation curing","authors":"G. Sidhu, Himanshu Guleria, D. Sharma, S. Goyal","doi":"10.1080/21650373.2023.2213241","DOIUrl":"https://doi.org/10.1080/21650373.2023.2213241","url":null,"abstract":"This study aims to investigate the influence of accelerated carbonation curing (ACC) on strength and permeation characteristics of pervious concrete. ACC envisaged well for CO2 sequestration in concrete. Pervious concrete is considered to be better recipient for CO2 curing due to presence of high interconnected pores. Carbonation of pervious concrete is deeper and homogeneous in comparison to normal concrete. Experimental results show that accelerated carbonation curing at 12-hour effectively improves strength of pervious concrete. Also, application-based interlocking pervious paver blocks subjected to 12-hour ACC provide the highest strength of 23.36 MPa. Permeation characteristics were found to be in optimum range despite of decrease in permeability due to the formation of CaCO3 in specimens subjected to ACC. Microstructural analysis also suggested intermingled matrix of CaCO3 and CSH gel. TGA revealed higher CO2 uptake for longer duration of ACC specimens, suggesting sequestration of CO2 in pervious concrete compare to conventional concrete.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1242 - 1254"},"PeriodicalIF":4.4,"publicationDate":"2023-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46374128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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