Pub Date : 2023-08-10DOI: 10.1080/21650373.2023.2243480
Adhora Tahsin, Salman Siddique, W. Ashraf, Melanie L. Sattler
This study investigated the performance of seawater-cured calcined clay-portlandite binder as a potential alternative to ordinary portland cement (OPC) for marine concrete applications. The samples for the investigation were prepared by mixing calcined kaolinite and bentonite clays in different ratios with portlandite. Seawater served as both the mixing and curing agent while acting as an activator due to its chloride and sulfate ion contents. The process involved three sequential steps: evaluating the changes in the mechanical performances, assessing the microstructural features, and estimating the environmental impacts. The results showed that the bound and total chloride content was significantly higher in the calcined clay mixes than in the OPC. The higher kaolinite enhanced the mechanical properties, and the strength-providing phases were Friedel’s salt, C-A-S-H, ettringite, and zeolites. It was concluded that this novel binder has the potential to reduce global warming by 85–90% more than OPC.
{"title":"Assessment of the durability and environmental impact of seawater-activated portlandite-calcined clay binder","authors":"Adhora Tahsin, Salman Siddique, W. Ashraf, Melanie L. Sattler","doi":"10.1080/21650373.2023.2243480","DOIUrl":"https://doi.org/10.1080/21650373.2023.2243480","url":null,"abstract":"This study investigated the performance of seawater-cured calcined clay-portlandite binder as a potential alternative to ordinary portland cement (OPC) for marine concrete applications. The samples for the investigation were prepared by mixing calcined kaolinite and bentonite clays in different ratios with portlandite. Seawater served as both the mixing and curing agent while acting as an activator due to its chloride and sulfate ion contents. The process involved three sequential steps: evaluating the changes in the mechanical performances, assessing the microstructural features, and estimating the environmental impacts. The results showed that the bound and total chloride content was significantly higher in the calcined clay mixes than in the OPC. The higher kaolinite enhanced the mechanical properties, and the strength-providing phases were Friedel’s salt, C-A-S-H, ettringite, and zeolites. It was concluded that this novel binder has the potential to reduce global warming by 85–90% more than OPC.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":" ","pages":""},"PeriodicalIF":4.4,"publicationDate":"2023-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44882627","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 : 2023-08-07DOI: 10.1080/21650373.2023.2241057
Zi-ming Yan, Hui Li, Mingming Wang, Lei Jiang, Baohua Chen
Abstract In this investigation, the phase evolution, reaction kinetics, and compressive strength of CO2-solidified cement paste at different temperature ranges (1–20 °C) were explored. Results indicated that temperature and time of carbon curing have a substantial impact on the carbonation process. When the curing temperature increased, the structure, size, and quantity of calcium carbonate polymorphs, as well as their decomposition temperature alter. Vaterite is easier to form when cured at a temperature of 1 °C. Furthermore, although the carbonation process is separated into two stages, it is primarily regulated kinetically by product layer diffusion with an activation energy of about 51.9 kJ/mol. Temperature influences not only the microstructure and reaction process but also the compressive strength and carbonation products, which follow a particular rule as the temperature changes. This research has significant implications for the enhancement of early strength and construction efficiency of building materials in low-temperature environments.
{"title":"The compressive strength, reaction kinetics and phases evolution of CO2-cured cement pastes at low temperatures","authors":"Zi-ming Yan, Hui Li, Mingming Wang, Lei Jiang, Baohua Chen","doi":"10.1080/21650373.2023.2241057","DOIUrl":"https://doi.org/10.1080/21650373.2023.2241057","url":null,"abstract":"Abstract In this investigation, the phase evolution, reaction kinetics, and compressive strength of CO2-solidified cement paste at different temperature ranges (1–20 °C) were explored. Results indicated that temperature and time of carbon curing have a substantial impact on the carbonation process. When the curing temperature increased, the structure, size, and quantity of calcium carbonate polymorphs, as well as their decomposition temperature alter. Vaterite is easier to form when cured at a temperature of 1 °C. Furthermore, although the carbonation process is separated into two stages, it is primarily regulated kinetically by product layer diffusion with an activation energy of about 51.9 kJ/mol. Temperature influences not only the microstructure and reaction process but also the compressive strength and carbonation products, which follow a particular rule as the temperature changes. This research has significant implications for the enhancement of early strength and construction efficiency of building materials in low-temperature environments.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"1 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41619540","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 : 2023-07-12DOI: 10.1080/21650373.2023.2232362
Huikai Yuan, Ting Luo, Dakang Zhang, Qiang Wang
Aluminum dross (AD) has become a severe problem for the environment and public health due to the great prosperity of the aluminum industry because it contains Al, AlN, Al4C3, fluoride salts, and various metal cations. In this review, the source and characterization of AD are introduced, and the differences between primary aluminum dross (PAD) and secondary aluminum dross (SAD) are analyzed. Then, the harmless treatment and utilization of AD are studied. Relative to the mature PAD recycling industry, the treatment of SAD is still in the small-scale experimental stage. The pyrometallurgical and hydrometallurgical routes are discussed as SAD processing methods, and the removal rate of hazardous content of SAD can reach 90%. Based on the high removal rate, high-purity Al, Al2O3, and other products can be prepared from SAD. Certain products, such as foaming materials, refractory materials, admixtures, and aluminum hydroxide gel material can be prepared by SAD. Finally, the economic and environmental values of the treatment and utilization of SAD are discussed. The environmental and economic assessment of SAD treatment behaves well in both life cycle assessment and life cycle cost calculations. A comprehensive display of SAD lifecycle treatment may promote the sustainable development of the aluminum industry. Graphical Abstract
{"title":"Harmless treatment and recycling of secondary aluminum dross: a review","authors":"Huikai Yuan, Ting Luo, Dakang Zhang, Qiang Wang","doi":"10.1080/21650373.2023.2232362","DOIUrl":"https://doi.org/10.1080/21650373.2023.2232362","url":null,"abstract":"Aluminum dross (AD) has become a severe problem for the environment and public health due to the great prosperity of the aluminum industry because it contains Al, AlN, Al4C3, fluoride salts, and various metal cations. In this review, the source and characterization of AD are introduced, and the differences between primary aluminum dross (PAD) and secondary aluminum dross (SAD) are analyzed. Then, the harmless treatment and utilization of AD are studied. Relative to the mature PAD recycling industry, the treatment of SAD is still in the small-scale experimental stage. The pyrometallurgical and hydrometallurgical routes are discussed as SAD processing methods, and the removal rate of hazardous content of SAD can reach 90%. Based on the high removal rate, high-purity Al, Al2O3, and other products can be prepared from SAD. Certain products, such as foaming materials, refractory materials, admixtures, and aluminum hydroxide gel material can be prepared by SAD. Finally, the economic and environmental values of the treatment and utilization of SAD are discussed. The environmental and economic assessment of SAD treatment behaves well in both life cycle assessment and life cycle cost calculations. A comprehensive display of SAD lifecycle treatment may promote the sustainable development of the aluminum industry. Graphical Abstract","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1460 - 1473"},"PeriodicalIF":4.4,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44751422","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 : 2023-07-12DOI: 10.1080/21650373.2023.2233512
Himanshu Sharma, Deepankar Kumar Ashish
Nanomaterials have emerged as a future application to concrete technology due to their unique composition. This study presents a review of nano CaCO3 in terms of microstructure, rate of hydration, consistency, flowability, setting time, workability, compressive strength, sorptivity, chloride resistance, and corrosion resistance. A remarkable decrease in pores and chloride ion penetration can be observed from the study. Compared to the controlled concrete, the addition of 1% nano CaCO3 also resulted in the reduction of the chloride diffusion coefficient. Compressive strength showed a significant improvement with the inclusion of 1-2% nano CaCO3, however, increasing its quantity showed reduction in compressive strength property. The accelerated hydration reaction forming supplementary C-S-H gel observed in the concrete containing nano CaCO3 has remarkably improved the microstructure of the mix by reducing its porosity. This study is an initiative to accumulate findings of nano-materials for its broad acceptance and future scope of work.
{"title":"Nano CaCO3 for enhancing properties of cement-based materials: a comprehensive review","authors":"Himanshu Sharma, Deepankar Kumar Ashish","doi":"10.1080/21650373.2023.2233512","DOIUrl":"https://doi.org/10.1080/21650373.2023.2233512","url":null,"abstract":"Nanomaterials have emerged as a future application to concrete technology due to their unique composition. This study presents a review of nano CaCO3 in terms of microstructure, rate of hydration, consistency, flowability, setting time, workability, compressive strength, sorptivity, chloride resistance, and corrosion resistance. A remarkable decrease in pores and chloride ion penetration can be observed from the study. Compared to the controlled concrete, the addition of 1% nano CaCO3 also resulted in the reduction of the chloride diffusion coefficient. Compressive strength showed a significant improvement with the inclusion of 1-2% nano CaCO3, however, increasing its quantity showed reduction in compressive strength property. The accelerated hydration reaction forming supplementary C-S-H gel observed in the concrete containing nano CaCO3 has remarkably improved the microstructure of the mix by reducing its porosity. This study is an initiative to accumulate findings of nano-materials for its broad acceptance and future scope of work.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":" ","pages":""},"PeriodicalIF":4.4,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44554173","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 : 2023-06-24DOI: 10.1080/21650373.2023.2222398
Congqi Luan, Qian Zhang, Zhenming Wu, Zipeng Han, Zonghui Zhou, P. Du, Feng Wu, Y. Huang
This article aims to investigate the effect of hydrophobic silica fume (HPS) on the rheological behavior, hydration performance, compressive strength, and microstructure of ultra-high-performance concrete (UHPC). Those characteristics of UHPC containing HPS or silica fume (SF) were explored by analytical techniques: rheology, X-ray diffraction, thermogravimetric, Fourier-transform infrared spectrum, X-ray photoelectron spectroscopy, 29Si nuclear magnetic resonance spectroscopy, mercury intrusion porosimeter, and scanning electron microscopy-energy dispersive spectroscopy. This study demonstrated that UHPC containing HPS showed a lower viscosity and yield stress and developed higher compressive strength and flowability than that of UHPC with SF. Furthermore, the HPS with higher pozzolanic activity consumed calcium hydroxide crystals and formed C-S-H gel, which refined the pore structure, improved the compressive strength, and decreased the porosity. Moreover, HPS changed the gel molecular structure, increased the Al substitution in the silicate network and mean chain length of C-(A)-S-H, and deceased Ca2p-Si2p energy separation values, which led to a higher degree of polymerization in the C-(A)-S-H.
{"title":"Uncovering the role of hydrophobic silica fume (HPS) in rheology, hydration, and microstructure of ultra-high-performance concrete (UHPC)","authors":"Congqi Luan, Qian Zhang, Zhenming Wu, Zipeng Han, Zonghui Zhou, P. Du, Feng Wu, Y. Huang","doi":"10.1080/21650373.2023.2222398","DOIUrl":"https://doi.org/10.1080/21650373.2023.2222398","url":null,"abstract":"This article aims to investigate the effect of hydrophobic silica fume (HPS) on the rheological behavior, hydration performance, compressive strength, and microstructure of ultra-high-performance concrete (UHPC). Those characteristics of UHPC containing HPS or silica fume (SF) were explored by analytical techniques: rheology, X-ray diffraction, thermogravimetric, Fourier-transform infrared spectrum, X-ray photoelectron spectroscopy, 29Si nuclear magnetic resonance spectroscopy, mercury intrusion porosimeter, and scanning electron microscopy-energy dispersive spectroscopy. This study demonstrated that UHPC containing HPS showed a lower viscosity and yield stress and developed higher compressive strength and flowability than that of UHPC with SF. Furthermore, the HPS with higher pozzolanic activity consumed calcium hydroxide crystals and formed C-S-H gel, which refined the pore structure, improved the compressive strength, and decreased the porosity. Moreover, HPS changed the gel molecular structure, increased the Al substitution in the silicate network and mean chain length of C-(A)-S-H, and deceased Ca2p-Si2p energy separation values, which led to a higher degree of polymerization in the C-(A)-S-H.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1399 - 1413"},"PeriodicalIF":4.4,"publicationDate":"2023-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48464867","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 : 2023-06-22DOI: 10.1080/21650373.2023.2223209
K. Anand, S. Goyal, M. Reddy
Recently, microbially induced calcium carbonate precipitation (MICCP) has been considered a novel method in corrosion prevention of reinforced concrete (RC) at the lab scale. In this investigation, silica fume (SF) based inoculum for the construction industry was developed and possessed a shelf life of 180 days with an effective cell count required to induce MICCP in RC structures. The SF-based inoculum was immobilized in fresh concrete to study the corrosion mitigation potential. The RC specimens were cured for 28 days and subjected to impressed current-induced chloride corrosion. Electrochemical and electromechanical impedance (EMI) techniques were employed separately on RC specimens for corrosion assessment. The results prove that the SF-based carrier can be effectively used for corrosion prevention and that the emerging EMI technique can efficiently monitor the corrosion process.
{"title":"Corrosion inhibition in reinforced concrete using silica fume immobilized bacterial cells","authors":"K. Anand, S. Goyal, M. Reddy","doi":"10.1080/21650373.2023.2223209","DOIUrl":"https://doi.org/10.1080/21650373.2023.2223209","url":null,"abstract":"Recently, microbially induced calcium carbonate precipitation (MICCP) has been considered a novel method in corrosion prevention of reinforced concrete (RC) at the lab scale. In this investigation, silica fume (SF) based inoculum for the construction industry was developed and possessed a shelf life of 180 days with an effective cell count required to induce MICCP in RC structures. The SF-based inoculum was immobilized in fresh concrete to study the corrosion mitigation potential. The RC specimens were cured for 28 days and subjected to impressed current-induced chloride corrosion. Electrochemical and electromechanical impedance (EMI) techniques were employed separately on RC specimens for corrosion assessment. The results prove that the SF-based carrier can be effectively used for corrosion prevention and that the emerging EMI technique can efficiently monitor the corrosion process.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1414 - 1429"},"PeriodicalIF":4.4,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45223204","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 : 2023-06-22DOI: 10.1080/21650373.2023.2224805
Navneet Sidhu, S. Goyal, M. Reddy
The present study aimed to develop a biocomposite constituting metakaolin as a suitable carrier material for immobilizing bacterial spores. The biocomposite was stored at 4 °C and 25 °C and showed a sustainable shelf-life of bacterial spores during the storage period of 180 days. Biocomposite was assessed for urease activity and calcium carbonate precipitation in corn steep liquor (CSL) as the growth medium. Significant improvements in strength and permeation were observed at 7 and 28 days of testing in concrete added with biocomposite. The study was extended to test the self-healing capabilities of biocomposite in prismatic specimens using CSL medium. Crack healing showed significant improvement in ultrasonic pulse velocity, indicating progressive healing of the crack, and the repaired surface was examined by water tightness. The precipitated minerals were assessed by scanning electron microscopy and X-ray diffraction. The CSL can be used as low-cost growth media, eventually decreasing the cost of self-healing concrete.
{"title":"Self-healing by biocomposite containing metakaolin immobilized bacterial spores in concrete using low-cost corn steep liquor media","authors":"Navneet Sidhu, S. Goyal, M. Reddy","doi":"10.1080/21650373.2023.2224805","DOIUrl":"https://doi.org/10.1080/21650373.2023.2224805","url":null,"abstract":"The present study aimed to develop a biocomposite constituting metakaolin as a suitable carrier material for immobilizing bacterial spores. The biocomposite was stored at 4 °C and 25 °C and showed a sustainable shelf-life of bacterial spores during the storage period of 180 days. Biocomposite was assessed for urease activity and calcium carbonate precipitation in corn steep liquor (CSL) as the growth medium. Significant improvements in strength and permeation were observed at 7 and 28 days of testing in concrete added with biocomposite. The study was extended to test the self-healing capabilities of biocomposite in prismatic specimens using CSL medium. Crack healing showed significant improvement in ultrasonic pulse velocity, indicating progressive healing of the crack, and the repaired surface was examined by water tightness. The precipitated minerals were assessed by scanning electron microscopy and X-ray diffraction. The CSL can be used as low-cost growth media, eventually decreasing the cost of self-healing concrete.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1430 - 1446"},"PeriodicalIF":4.4,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46337207","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 : 2023-06-15DOI: 10.1080/21650373.2023.2225189
J. Assaad, A. Mardani
Abstract This study assesses the feasibility of limestone (LS) replacement by recycled fine aggregates (RFAs) on grindability and Portland cement properties. Two RFA types generated from the fine fraction of crushed concrete and ceramic wastes are ground in 22-liters grinding mill at 310 and 400 ± 20 m2/kg Blaine fineness, and then incorporated at 20% and 35% rates in clinker cement mixtures. Because of their porous nature, RFAs required about 22% to 30% less communition energy than LS, which could be advantageous to reduce grinding costs for given Blaine fineness. Mortars prepared with RFA-based cements yielded better strength recovery over time and lower water sorptivity than LS-based cement, either due to promoted hydraulic activity or pozzolanic reactions. The comminution of RFA fillers to 400 ± 20 m2/kg fineness is a viable alternative to mitigate the dilution effect while maintaining similar grinding energy and mechanical strengths as the control 95% clinker cement.
{"title":"Limestone replacements by fine crushed concrete and ceramic wastes during the production of Portland cement","authors":"J. Assaad, A. Mardani","doi":"10.1080/21650373.2023.2225189","DOIUrl":"https://doi.org/10.1080/21650373.2023.2225189","url":null,"abstract":"Abstract This study assesses the feasibility of limestone (LS) replacement by recycled fine aggregates (RFAs) on grindability and Portland cement properties. Two RFA types generated from the fine fraction of crushed concrete and ceramic wastes are ground in 22-liters grinding mill at 310 and 400 ± 20 m2/kg Blaine fineness, and then incorporated at 20% and 35% rates in clinker cement mixtures. Because of their porous nature, RFAs required about 22% to 30% less communition energy than LS, which could be advantageous to reduce grinding costs for given Blaine fineness. Mortars prepared with RFA-based cements yielded better strength recovery over time and lower water sorptivity than LS-based cement, either due to promoted hydraulic activity or pozzolanic reactions. The comminution of RFA fillers to 400 ± 20 m2/kg fineness is a viable alternative to mitigate the dilution effect while maintaining similar grinding energy and mechanical strengths as the control 95% clinker cement.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1447 - 1459"},"PeriodicalIF":4.4,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46377169","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 : 2023-06-07DOI: 10.1080/21650373.2023.2220325
Jiameng Lu, Qiang Wang, Tong Su
Magnesium phosphate cement (MPC) is a promising repair building material, and nowadays, the application of MPC is more extensive. The incorporation of mineral admixtures is not only a powerful method to improve the performance of MPC but also greatly reduces the cost of this high-end material. Recently, mineral admixture has been frequently used in MPC, and numerous studies have made efforts to investigate the mechanism and properties of this new system. According to recent research, this paper reviews the effects of different types of mineral admixtures on the hydration, mechanical properties, rheology, and durability of MPC. Afterward, existing problems of mineral admixtures and factors that can affect their behaviors are discussed. It aims to use the mineral admixtures in the MPC system effectively.
{"title":"A systematic review on properties of magnesium phosphate cement modified by mineral admixtures","authors":"Jiameng Lu, Qiang Wang, Tong Su","doi":"10.1080/21650373.2023.2220325","DOIUrl":"https://doi.org/10.1080/21650373.2023.2220325","url":null,"abstract":"Magnesium phosphate cement (MPC) is a promising repair building material, and nowadays, the application of MPC is more extensive. The incorporation of mineral admixtures is not only a powerful method to improve the performance of MPC but also greatly reduces the cost of this high-end material. Recently, mineral admixture has been frequently used in MPC, and numerous studies have made efforts to investigate the mechanism and properties of this new system. According to recent research, this paper reviews the effects of different types of mineral admixtures on the hydration, mechanical properties, rheology, and durability of MPC. Afterward, existing problems of mineral admixtures and factors that can affect their behaviors are discussed. It aims to use the mineral admixtures in the MPC system effectively.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1387 - 1398"},"PeriodicalIF":4.4,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42369453","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 : 2023-06-07DOI: 10.1080/21650373.2023.2219256
P. Li, Shiwei Liu, Y. Bai, Jianhui Tang, Jun Tao
This paper investigated rheological behavior and leakage plugging effect of alkali-activated slag (AAS) with the aim of promoting plugging application of slag resources. A series of laboratory tests were carried out to study effects of different activator concentrations (i.e. 1, 2, and 3 mol/L) and temperatures (i.e. 20, 30, and 40 °C) on time-dependent rheological properties (i.e. yield stress, apparent viscosity, and thixotropy) of AAS paste, which was made from ground granulated blast furnace slag (GGBS) and sodium hydroxide activator. The temporal variations in hydration process of AAS paste were examined and analyzed using X-ray diffraction (XRD) and scanning electron microscope (SEM). Moreover, the plugging effect of AAS paste was investigated by tunnel leakage plugging test. The test results indicate that the shearing behavior of AAS paste could reasonably be described by Bingham plastic model. There was a great increase in yield stress, apparent viscosity, and thixotropy of AAS paste with an increase in activator concentration and temperature. The increase in those rheological properties were mainly attributed to the rapid formation of C-S-H gels and aluminum hydroxide magnesium at a higher concentration level and temperature. In addition, a power function was proposed to fit the time-dependent apparent viscosity, which enabled the explicit quantification of activation energy, i.e. the minimum energy required to initiate the hydration of AAS paste. In leakage plugging test, the characteristic of decreasing with the increase of exciter concentration and temperature was seen in both the point of water pressure and the time required to reach 0.5 MPa sealing water pressure.
{"title":"Research on rheology performance and sealing effect of alkali-activated GGBS paste used for tunnel leakage plugging","authors":"P. Li, Shiwei Liu, Y. Bai, Jianhui Tang, Jun Tao","doi":"10.1080/21650373.2023.2219256","DOIUrl":"https://doi.org/10.1080/21650373.2023.2219256","url":null,"abstract":"This paper investigated rheological behavior and leakage plugging effect of alkali-activated slag (AAS) with the aim of promoting plugging application of slag resources. A series of laboratory tests were carried out to study effects of different activator concentrations (i.e. 1, 2, and 3 mol/L) and temperatures (i.e. 20, 30, and 40 °C) on time-dependent rheological properties (i.e. yield stress, apparent viscosity, and thixotropy) of AAS paste, which was made from ground granulated blast furnace slag (GGBS) and sodium hydroxide activator. The temporal variations in hydration process of AAS paste were examined and analyzed using X-ray diffraction (XRD) and scanning electron microscope (SEM). Moreover, the plugging effect of AAS paste was investigated by tunnel leakage plugging test. The test results indicate that the shearing behavior of AAS paste could reasonably be described by Bingham plastic model. There was a great increase in yield stress, apparent viscosity, and thixotropy of AAS paste with an increase in activator concentration and temperature. The increase in those rheological properties were mainly attributed to the rapid formation of C-S-H gels and aluminum hydroxide magnesium at a higher concentration level and temperature. In addition, a power function was proposed to fit the time-dependent apparent viscosity, which enabled the explicit quantification of activation energy, i.e. the minimum energy required to initiate the hydration of AAS paste. In leakage plugging test, the characteristic of decreasing with the increase of exciter concentration and temperature was seen in both the point of water pressure and the time required to reach 0.5 MPa sealing water pressure.","PeriodicalId":48521,"journal":{"name":"Journal of Sustainable Cement-Based Materials","volume":"12 1","pages":"1360 - 1375"},"PeriodicalIF":4.4,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42531747","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：