Pub Date : 2023-05-10DOI: 10.1080/21650373.2023.2210316
Long Zheng, Yingfeng Zuo, Xingong Li, Yi-quiang Wu
Abstract Magnesium-based aerated cement has the characteristics of noncombustibility and nontoxicity compared with traditional organic aerated materials, realizing low-carbon manufacturing and energy saving in building construction. However, the pore walls of ordinary magnesium-based aerated cement are thin and brittle and can easily collapse under force, limiting its application in energy saving. This study aimed to obtain low-cost, low-energy, lightweight, high-strength, flame-retardant, and heat-insulating thermal insulation materials. Inspired by the formation process of stacked stones, calcium stearate was adsorbed on solid particles, stabilizing the pore and forming independent lumps of gel-state crystals in this study. At the same time, the hydrogen bonds of hydroxyethyl cellulose were used to chemically stitch the dispersed crystals to form a dense laminated structure. The interfacial compatibility between bamboo scraps and magnesium oxychloride improved the load transfer efficiency. The results showed that the strength-to-weight ratio of the composites increased 2.5 times, and the softening coefficient increased about 2 times. In comparison, the mechanical properties and thermal insulation properties of the composites far exceeded those of most thermal insulation materials, providing a theoretical basis for their use in the field of multifunctional building materials.
{"title":"Laminated stone-inspired multi-layer crystal structure reinforced bamboo scrap/magnesium oxychloride lightweight composites","authors":"Long Zheng, Yingfeng Zuo, Xingong Li, Yi-quiang Wu","doi":"10.1080/21650373.2023.2210316","DOIUrl":"https://doi.org/10.1080/21650373.2023.2210316","url":null,"abstract":"Abstract Magnesium-based aerated cement has the characteristics of noncombustibility and nontoxicity compared with traditional organic aerated materials, realizing low-carbon manufacturing and energy saving in building construction. However, the pore walls of ordinary magnesium-based aerated cement are thin and brittle and can easily collapse under force, limiting its application in energy saving. This study aimed to obtain low-cost, low-energy, lightweight, high-strength, flame-retardant, and heat-insulating thermal insulation materials. Inspired by the formation process of stacked stones, calcium stearate was adsorbed on solid particles, stabilizing the pore and forming independent lumps of gel-state crystals in this study. At the same time, the hydrogen bonds of hydroxyethyl cellulose were used to chemically stitch the dispersed crystals to form a dense laminated structure. The interfacial compatibility between bamboo scraps and magnesium oxychloride improved the load transfer efficiency. The results showed that the strength-to-weight ratio of the composites increased 2.5 times, and the softening coefficient increased about 2 times. In comparison, the mechanical properties and thermal insulation properties of the composites far exceeded those of most thermal insulation materials, providing a theoretical basis for their use in the field of multifunctional building materials.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1218 - 1227"},"PeriodicalIF":4.4,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46309131","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 : 2023-05-04DOI: 10.1080/21650373.2022.2082577
Tao Liu, Q. Yu, H. Brouwers, Xiaochun Fan
This study aims to investigate the chloride diffusion behavior of alkali activated slag and fly ash blends with different contents of waste glass powder (GP) addition. The reaction heat flow of alkali activated slag/fly ash/waste glass is characterized. The reaction products are determined by X-ray diffraction and thermogravimetric analysis (TGA). N2 adsorption analysis (BET) is used to evaluate the microstructure of samples. The accelerated chloride penetration test (ACPT) is applied to study the chloride resistance of the AAMs. Subsequently, the leaching test of chloride penetrated samples are conducted and ion chromatography is utilized to measure the chloride content in the samples. According to the BET results, the total volume of mesopores decreases with increasing GP content. The results of ACPT show that the increasing GP in AAMs shows an enhancement of chloride resistance.
{"title":"Utilization of waste glass in alkali activated slag/fly ash blends: reaction process, microstructure, and chloride diffusion behavior","authors":"Tao Liu, Q. Yu, H. Brouwers, Xiaochun Fan","doi":"10.1080/21650373.2022.2082577","DOIUrl":"https://doi.org/10.1080/21650373.2022.2082577","url":null,"abstract":"This study aims to investigate the chloride diffusion behavior of alkali activated slag and fly ash blends with different contents of waste glass powder (GP) addition. The reaction heat flow of alkali activated slag/fly ash/waste glass is characterized. The reaction products are determined by X-ray diffraction and thermogravimetric analysis (TGA). N2 adsorption analysis (BET) is used to evaluate the microstructure of samples. The accelerated chloride penetration test (ACPT) is applied to study the chloride resistance of the AAMs. Subsequently, the leaching test of chloride penetrated samples are conducted and ion chromatography is utilized to measure the chloride content in the samples. According to the BET results, the total volume of mesopores decreases with increasing GP content. The results of ACPT show that the increasing GP in AAMs shows an enhancement of chloride resistance.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"516 - 526"},"PeriodicalIF":4.4,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49166432","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 : 2023-04-13DOI: 10.1080/21650373.2023.2196793
R. Sudhakar, B. Balakrishnan, M. Santhanam, Harini Santhanam
Autoclaved Aerated Concrete (AAC) masonry systems are widely used as partition walls in framed structures. Cracking is often reported in such walls after a certain duration of construction. Dimensional changes occurring in the masonry system under varying temperature and relative humidity (RH) conditions are some of the primary reasons for such distress. Past studies show that bedding mortar can significantly contribute to dimensional changes due to shrinkage behaviour. Most of the literature focus on characterising the influence of raw materials on the microstructure, strength, and performance characteristics of AAC blocks. In the current study, experimental studies on AAC blocks with and without bedding mortars are conducted under controlled and ambient environmental conditions to understand the impact of temperature and RH on the dimensional change behaviour of these wall systems. Furthermore, the dimensional changes observed for AAC blocks are compared with conventional clay and fly ash bricks to understand the intrinsic properties of these materials. In the experimental studies under ambient conditions, small and large-scale AAC masonry units are built and monitored for dimensional change over a period of one month. Results show that the AAC block undergoes significant dimensional change along with the bedding mortar, which is greatly influenced by the boundary conditions of the masonry system, relative humidity, and temperature. In the end, recommendations are given at the component and system levels to reduce the crack development in AAC masonry.
{"title":"Quantification of volume change of AAC blocks for various environmental conditions","authors":"R. Sudhakar, B. Balakrishnan, M. Santhanam, Harini Santhanam","doi":"10.1080/21650373.2023.2196793","DOIUrl":"https://doi.org/10.1080/21650373.2023.2196793","url":null,"abstract":"Autoclaved Aerated Concrete (AAC) masonry systems are widely used as partition walls in framed structures. Cracking is often reported in such walls after a certain duration of construction. Dimensional changes occurring in the masonry system under varying temperature and relative humidity (RH) conditions are some of the primary reasons for such distress. Past studies show that bedding mortar can significantly contribute to dimensional changes due to shrinkage behaviour. Most of the literature focus on characterising the influence of raw materials on the microstructure, strength, and performance characteristics of AAC blocks. In the current study, experimental studies on AAC blocks with and without bedding mortars are conducted under controlled and ambient environmental conditions to understand the impact of temperature and RH on the dimensional change behaviour of these wall systems. Furthermore, the dimensional changes observed for AAC blocks are compared with conventional clay and fly ash bricks to understand the intrinsic properties of these materials. In the experimental studies under ambient conditions, small and large-scale AAC masonry units are built and monitored for dimensional change over a period of one month. Results show that the AAC block undergoes significant dimensional change along with the bedding mortar, which is greatly influenced by the boundary conditions of the masonry system, relative humidity, and temperature. In the end, recommendations are given at the component and system levels to reduce the crack development in AAC masonry.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1205 - 1217"},"PeriodicalIF":4.4,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45603719","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 : 2023-04-03DOI: 10.1080/21650373.2022.2066028
Zixing Liu, M. Cao, Chaopeng Xie
Calcium carbonate whiskers (CW) showed good cracking resistance at the microscale. In this research, four different CW volume fractions (1.0%, 1.5%, 2.0%, and 3.0%) were added into cement mortar. The purpose was to further investigate the fracture behavior by using a semi-circular bend test (SCB) of SCB-CW after different freezing and thawing cycles (0 cycles, 25 cycles, 50 cycles, 75 cycles, and 100 cycles). In addition, three analytical models of SCB-PM and SCB-CW were established to predict the stress-strain response after different freezing and thawing cycles. The experimental results showed that the lowest mass increment, electric flux, highest residual flexural strength, fracture toughness, and fracture energy after different freezing and thawing cycles were observed in SCB-CW3.0. It was observed from the experimental results that only model II completely satisfied its basic requirements and its parameter c was closely correlated with the number of freeze-thaw cycles and the CW volume fraction. Highlights Calcium carbonate whisker is added to enhance the fracture behavior of mortar. The different freezing and thawing cycles are considered. The results are obtained using semi-circular bend test and analytical models are established. The highest fracture parameters are observed in SCB-CW3.0 under different freezing and thawing cycles. The model II is suggested for predicting the experimental response of composites.
{"title":"Fracture features of calcium carbonate whisker-based composites under freezing and thawing cycles using semi-circular bend test","authors":"Zixing Liu, M. Cao, Chaopeng Xie","doi":"10.1080/21650373.2022.2066028","DOIUrl":"https://doi.org/10.1080/21650373.2022.2066028","url":null,"abstract":"Calcium carbonate whiskers (CW) showed good cracking resistance at the microscale. In this research, four different CW volume fractions (1.0%, 1.5%, 2.0%, and 3.0%) were added into cement mortar. The purpose was to further investigate the fracture behavior by using a semi-circular bend test (SCB) of SCB-CW after different freezing and thawing cycles (0 cycles, 25 cycles, 50 cycles, 75 cycles, and 100 cycles). In addition, three analytical models of SCB-PM and SCB-CW were established to predict the stress-strain response after different freezing and thawing cycles. The experimental results showed that the lowest mass increment, electric flux, highest residual flexural strength, fracture toughness, and fracture energy after different freezing and thawing cycles were observed in SCB-CW3.0. It was observed from the experimental results that only model II completely satisfied its basic requirements and its parameter c was closely correlated with the number of freeze-thaw cycles and the CW volume fraction. Highlights Calcium carbonate whisker is added to enhance the fracture behavior of mortar. The different freezing and thawing cycles are considered. The results are obtained using semi-circular bend test and analytical models are established. The highest fracture parameters are observed in SCB-CW3.0 under different freezing and thawing cycles. The model II is suggested for predicting the experimental response of composites.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"369 - 380"},"PeriodicalIF":4.4,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43849251","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 : 2023-04-03DOI: 10.1080/21650373.2022.2074911
Hao Sui, P. Hou, Yanming Liu, K. Sagoe-Crentsil, Felipe Basquiroto de Souza, W. Duan
Abstract Limestone calcined clay cement (LC3) holds promise as a new type of sustainable cement-based material, but the mechanisms underpinning its engineering performance are still poorly understood. Here, a metal intrusion-enhanced imaging approach was employed to quantitatively analyze and link the pore structure development of LC3 to its hydration process, i.e. solid-phase development, and mechanical performance. We found that the early age microstructural development in LC3 is inhomogeneous, with the perimeter of limestone particles displaying higher porosity relative to that surrounding calcined clay and clinker. At later ages, the formation of carboaluminates and calcium-aluminate-silicate-hydrates homogenized the overall microstructure of LC3, thereby delivering improved mechanical performance. Overall, our analysis suggested a more efficient particle packing in LC3 mixes, which decreases the volume/connectivity of micro-pores and can account for LC3’s notable flexural strength. These findings can assist the development of improved LC3 binder formulations alongside other ternary binders with possibly higher limestone additions.
{"title":"Limestone calcined clay cement: mechanical properties, crystallography, and microstructure development","authors":"Hao Sui, P. Hou, Yanming Liu, K. Sagoe-Crentsil, Felipe Basquiroto de Souza, W. Duan","doi":"10.1080/21650373.2022.2074911","DOIUrl":"https://doi.org/10.1080/21650373.2022.2074911","url":null,"abstract":"Abstract Limestone calcined clay cement (LC3) holds promise as a new type of sustainable cement-based material, but the mechanisms underpinning its engineering performance are still poorly understood. Here, a metal intrusion-enhanced imaging approach was employed to quantitatively analyze and link the pore structure development of LC3 to its hydration process, i.e. solid-phase development, and mechanical performance. We found that the early age microstructural development in LC3 is inhomogeneous, with the perimeter of limestone particles displaying higher porosity relative to that surrounding calcined clay and clinker. At later ages, the formation of carboaluminates and calcium-aluminate-silicate-hydrates homogenized the overall microstructure of LC3, thereby delivering improved mechanical performance. Overall, our analysis suggested a more efficient particle packing in LC3 mixes, which decreases the volume/connectivity of micro-pores and can account for LC3’s notable flexural strength. These findings can assist the development of improved LC3 binder formulations alongside other ternary binders with possibly higher limestone additions.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"427 - 440"},"PeriodicalIF":4.4,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46320706","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 : 2023-03-30DOI: 10.1080/21650373.2023.2188274
Xiao Zhi, X. An
China announced the goal of carbon peaking by 2035 and carbon neutral by 2060. In 2020, the carbon emission of cement production was 1.32 billion tons, accounting for about 80% of the total carbon emission of building materials in China. The carbon emission of cement production mainly comes from the clinker production. The key to cut emission is to reduce the consumption of fossil energy and limestone. The major measures include energy efficiency improvement, alternative fuel usage, raw material substitution, and new low-carbon cement clinker production technology. This paper illustrates the effect of low carbon technologies application and the carbon reducing potential from this period to 2060. It is predicted that when carbon neutral goal would be achieved by 2060, the carbon reduction from energy efficiency improvement, alternative fuels usage, alternative raw materials usage, low-carbon cement and CCUS technology would be 8%, 4%, 27%, 28% and 33%, respectively. Meanwhile, the 13% of CO2 related with cement producing would be used to curing cement-based materials.
{"title":"Low carbon technology roadmap of China cement industry","authors":"Xiao Zhi, X. An","doi":"10.1080/21650373.2023.2188274","DOIUrl":"https://doi.org/10.1080/21650373.2023.2188274","url":null,"abstract":"China announced the goal of carbon peaking by 2035 and carbon neutral by 2060. In 2020, the carbon emission of cement production was 1.32 billion tons, accounting for about 80% of the total carbon emission of building materials in China. The carbon emission of cement production mainly comes from the clinker production. The key to cut emission is to reduce the consumption of fossil energy and limestone. The major measures include energy efficiency improvement, alternative fuel usage, raw material substitution, and new low-carbon cement clinker production technology. This paper illustrates the effect of low carbon technologies application and the carbon reducing potential from this period to 2060. It is predicted that when carbon neutral goal would be achieved by 2060, the carbon reduction from energy efficiency improvement, alternative fuels usage, alternative raw materials usage, low-carbon cement and CCUS technology would be 8%, 4%, 27%, 28% and 33%, respectively. Meanwhile, the 13% of CO2 related with cement producing would be used to curing cement-based materials.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"771 - 774"},"PeriodicalIF":4.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43094304","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 : 2023-03-30DOI: 10.1080/21650373.2023.2185828
S. Nassiri, Ananya Markandeya, M. Haider, Antonio Valencia, M. Rangelov, Hui Li, Aaron Halsted, David Bollinger, J. McCloy
Abstract This study evaluates two calcium-silicate-hydrate (C-S-H) nanoseeds: tobermorite (TOB) and foshagite (FOS), for accelerating hydration and strength gain in cement systems. TOB and FOS seeding at 1.5%wt generated 7 and 3 times more heat of hydration than the control at hour four. In addition, 1.5%wt TOB and 1%wt FOS seeding increased 1- and 3-day compressive strength (fc ) by 40 and 30% and flexural strength (ff ) by 20 and 23%. Twenty-eight-day fc and ff increased by up 30 and 17% with 1.5%wt TOB. The contribution of C-S-H seeds to the total global warming potential of seeded mortars was 9–15% and down to 2–5% using recycled steam. After the improvements in 28-day fc were factored in, the carbon intensity index of seeded mortars was lower than the control by up to 20%. Based on these initial results, the studied hydrothermally synthesized C-S-H seeds appear sensible from the strength development and environmental stances.
{"title":"Technical and environmental assessment of hydrothermally synthesized foshagite and tobermorite-like crystals as fibrillar C-S-H seeds in cementitious materials","authors":"S. Nassiri, Ananya Markandeya, M. Haider, Antonio Valencia, M. Rangelov, Hui Li, Aaron Halsted, David Bollinger, J. McCloy","doi":"10.1080/21650373.2023.2185828","DOIUrl":"https://doi.org/10.1080/21650373.2023.2185828","url":null,"abstract":"Abstract This study evaluates two calcium-silicate-hydrate (C-S-H) nanoseeds: tobermorite (TOB) and foshagite (FOS), for accelerating hydration and strength gain in cement systems. TOB and FOS seeding at 1.5%wt generated 7 and 3 times more heat of hydration than the control at hour four. In addition, 1.5%wt TOB and 1%wt FOS seeding increased 1- and 3-day compressive strength (fc ) by 40 and 30% and flexural strength (ff ) by 20 and 23%. Twenty-eight-day fc and ff increased by up 30 and 17% with 1.5%wt TOB. The contribution of C-S-H seeds to the total global warming potential of seeded mortars was 9–15% and down to 2–5% using recycled steam. After the improvements in 28-day fc were factored in, the carbon intensity index of seeded mortars was lower than the control by up to 20%. Based on these initial results, the studied hydrothermally synthesized C-S-H seeds appear sensible from the strength development and environmental stances.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1181 - 1204"},"PeriodicalIF":4.4,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41802968","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}
Using high-volume cement in 3D printed concrete (3DPC) can lead to later crack formation. Accordingly, mineral admixtures can be used as cement replacements to mitigate this disadvantage. In this study, fly ash, slag, and a type of silica fume (with a high water consumption) are selected as supplementary materials in 3DPC under different substitution rates. A method for the printability evaluation of each test group in the orthogonal experiment is proposed based on a comprehensive analysis of the rheological behavior and mechanical performance of the test samples. The results indicate that a cement replacement ratio of 50% can be achieved in 3DPC while retaining its rheological behavior and mechanical performance. According to the actual printing test, the selected silica fume improves the buildability of 3DPC and can serve as an economical and effective cement substitute. The findings in this study also reveal the potential application of poor-quality mineral admixtures in 3DPC, which can increase economy and reduce CO2 emissions.
{"title":"Study of 3D printed concrete with low-carbon cementitious materials based on its rheological properties and mechanical performances","authors":"Weijiu Cui, Tianheng Wang, Xinfa Chen, Wenkai Shen, Xinyu Shi, Sheng Wang, P. Zhang","doi":"10.1080/21650373.2023.2189172","DOIUrl":"https://doi.org/10.1080/21650373.2023.2189172","url":null,"abstract":"Using high-volume cement in 3D printed concrete (3DPC) can lead to later crack formation. Accordingly, mineral admixtures can be used as cement replacements to mitigate this disadvantage. In this study, fly ash, slag, and a type of silica fume (with a high water consumption) are selected as supplementary materials in 3DPC under different substitution rates. A method for the printability evaluation of each test group in the orthogonal experiment is proposed based on a comprehensive analysis of the rheological behavior and mechanical performance of the test samples. The results indicate that a cement replacement ratio of 50% can be achieved in 3DPC while retaining its rheological behavior and mechanical performance. According to the actual printing test, the selected silica fume improves the buildability of 3DPC and can serve as an economical and effective cement substitute. The findings in this study also reveal the potential application of poor-quality mineral admixtures in 3DPC, which can increase economy and reduce CO2 emissions.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"832 - 841"},"PeriodicalIF":4.4,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44319025","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 : 2023-03-06DOI: 10.1080/21650373.2023.2184430
Dong Cui, Ying-chuan Wu, Xiaohui Xie, Guanfei Tian, Guantong Han, Yi Wan, K. Zheng, Wenting Li
The microstructure of a 3D-printed mortar was investigated in present study. To enhance the density contrast between sand and cementitious slurry, a novel leaching strategy was used as an auxiliary method, based on which the spatial dispersion of sands in 3D-printed mortar was rendered. Meanwhile, to alleviate the problem of CT’s limited resolution, X-ray attenuation method (XRAM) was introduced in this study to investigate the spatial distribution of local porosity in 3D-printed mortar. Besides, focusing on single filaments, the upper part of the filaments presented lower sand rate and higher porosity than the lower part, and the difference between the filaments located near the top of 3D-printed mortar was more significant. Finally, based on the sliding method, the interlayer width, average porosity and average sand ratio of 3D-printed mortar were estimated as 640 21.9% and 43.1%, respectively. The research results would deepen the understanding of 3D-printed concrete.
{"title":"Investigation on the microstructure of a 3D-printed mortar through a novel leaching-subsidiary tomography","authors":"Dong Cui, Ying-chuan Wu, Xiaohui Xie, Guanfei Tian, Guantong Han, Yi Wan, K. Zheng, Wenting Li","doi":"10.1080/21650373.2023.2184430","DOIUrl":"https://doi.org/10.1080/21650373.2023.2184430","url":null,"abstract":"The microstructure of a 3D-printed mortar was investigated in present study. To enhance the density contrast between sand and cementitious slurry, a novel leaching strategy was used as an auxiliary method, based on which the spatial dispersion of sands in 3D-printed mortar was rendered. Meanwhile, to alleviate the problem of CT’s limited resolution, X-ray attenuation method (XRAM) was introduced in this study to investigate the spatial distribution of local porosity in 3D-printed mortar. Besides, focusing on single filaments, the upper part of the filaments presented lower sand rate and higher porosity than the lower part, and the difference between the filaments located near the top of 3D-printed mortar was more significant. Finally, based on the sliding method, the interlayer width, average porosity and average sand ratio of 3D-printed mortar were estimated as 640 21.9% and 43.1%, respectively. The research results would deepen the understanding of 3D-printed concrete.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"818 - 831"},"PeriodicalIF":4.4,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47389876","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 : 2023-02-22DOI: 10.1080/21650373.2023.2180103
Shaofeng Zhang, D. Niu, Yan Wang, Wenqiang Tian, Daming Luo, Lu Zhang
The impacts of steel slag (SS) and ground-granulated blast-furnace slag (GGBS) on the mechanical properties, hydration process, and microscopic characteristics of concrete were investigated in this study. The results show that substituting cement with SS has a negative impact on the strength; however, partial replacement of SS with GGBS could produce positive effect by facilitating the whole hydration of SS and cement. The improvement impact of GGBS on strength was small in early stages (3–28 days) and occurred mainly in the late stages (28–90 days). Meanwhile, the heat flow and cumulative hydration heat was decreased by the incorporation of SS and GGBS, in comparison to plain cement. The microscopic analysis results proved that replacing SS with GGBS could increase the whole hydration reaction degree, decrease the content of Ca(OH)2, enhance the compactness of the interfacial transition zone (ITZ), and refine the pore structure of concrete. Furthermore, a formula was established to estimate the splitting tensile strength according to compressive strength. The finding of this study provides valuable information on the practical application of the industrial wastes in concrete.
{"title":"Insight into mechanical properties and microstructure of concrete containing steel slag and ground-granulated blast-furnace slag","authors":"Shaofeng Zhang, D. Niu, Yan Wang, Wenqiang Tian, Daming Luo, Lu Zhang","doi":"10.1080/21650373.2023.2180103","DOIUrl":"https://doi.org/10.1080/21650373.2023.2180103","url":null,"abstract":"The impacts of steel slag (SS) and ground-granulated blast-furnace slag (GGBS) on the mechanical properties, hydration process, and microscopic characteristics of concrete were investigated in this study. The results show that substituting cement with SS has a negative impact on the strength; however, partial replacement of SS with GGBS could produce positive effect by facilitating the whole hydration of SS and cement. The improvement impact of GGBS on strength was small in early stages (3–28 days) and occurred mainly in the late stages (28–90 days). Meanwhile, the heat flow and cumulative hydration heat was decreased by the incorporation of SS and GGBS, in comparison to plain cement. The microscopic analysis results proved that replacing SS with GGBS could increase the whole hydration reaction degree, decrease the content of Ca(OH)2, enhance the compactness of the interfacial transition zone (ITZ), and refine the pore structure of concrete. Furthermore, a formula was established to estimate the splitting tensile strength according to compressive strength. The finding of this study provides valuable information on the practical application of the industrial wastes in concrete.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1169 - 1180"},"PeriodicalIF":4.4,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49229687","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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