Cement and Concrete Composites最新文献_第2页

Thermodynamic calculation of CaCO3 polymorphs from aqueous carbonation of Portland cement with the addition of organic additives 添加有机外加剂后硅酸盐水泥水炭化CaCO3多态物的热力学计算

Cement and Concrete Composites Pub Date : 2025-08-06 DOI: 10.1016/j.cemconcomp.2025.106279

Xujia You, Xiang Hu, Zhiqiang Xiao, Zain Ali Saleh Bairq, Wei Chen, Nemkumar Banthia, Caijun Shi

{"title":"Thermodynamic calculation of CaCO3 polymorphs from aqueous carbonation of Portland cement with the addition of organic additives","authors":"Xujia You, Xiang Hu, Zhiqiang Xiao, Zain Ali Saleh Bairq, Wei Chen, Nemkumar Banthia, Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106279","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106279","url":null,"abstract":"The carbonation curing of cement-based materials has been widely recognized as one of the most promising technologies for CO2 storage and utilization. Calcium carbonate is the main carbonation product of cement-based materials, which includes three anhydrous polymorphs: cubic calcite, needle-like aragonite, and amorphous vaterite. Products composed of aragonite with a large aspect ratio are inclined to develop whisker-like structures, which confer enhanced flexural strength and toughness. In this paper, a thermodynamic model for the formation of different CaCO3 polymorphs during the aqueous carbonation with organic additives that selectively promote aragonite formation is proposed. The effects of four organic additives including polyacrylic acid (PAA), polyacrylamide (PAM), polyvinyl alcohol (PVA) and monoethanolamine (MEA) on the proportion of different CaCO3 polymorphs produced during carbonation were quantified. By comparing the literature data and experimental results with the modelling output, the average error of the model for the four different organic additives (PAA, PAM, PVA, MEA) is 2.70%, 4.61%, 3.05% and 3.71% respectively. Through calculation, the thermodynamic mechanism of the selective adsorption of organic additives on the surface of aragonite has been revealed. The carbonation parameters, including temperature, CO2 input and additives concentration have been found to specifically affect the polymorphs of CaCO3 in three aspects: 1) adjusting the effective concentration of organic additives adsorbed on the surface of calcium carbonate; 2) altering the difference in surface energy and critical nucleation Gibbs free energy between aragonite and calcite; 3) regulating the reduction in surface energy attributed to per mole organic additive.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inducing the formation of organic-inorganic carbonated composites via extracellular polymeric substances (EPS)-modified carbonation in low-calcium CO2 sequestration materials 低钙CO2封存材料胞外聚合物（EPS）改性碳化诱导有机-无机碳化复合材料的形成

Cement and Concrete Composites Pub Date : 2025-08-05 DOI: 10.1016/j.cemconcomp.2025.106277

Siyuan Bian, Yan Wang, Cheng Yao, Xue Xiang, Ruixing Wang

{"title":"Inducing the formation of organic-inorganic carbonated composites via extracellular polymeric substances (EPS)-modified carbonation in low-calcium CO2 sequestration materials","authors":"Siyuan Bian, Yan Wang, Cheng Yao, Xue Xiang, Ruixing Wang","doi":"10.1016/j.cemconcomp.2025.106277","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106277","url":null,"abstract":"Extracellular polymeric substances (EPS), mainly composed of polysaccharides and proteins, are high-molecular compounds secreted during the metabolic process of bacteria. This study primarily examined the modification effects and influencing factors of EPS on the carbonation of low-calcium CO2 sequestration materials. The results indicate that EPS significantly enhanced the compressive strength of carbonated samples, from 2.21 MPa to 32.90 MPa, as well as the carbonation degree from 4.44 wt.% to 11.51 wt.%. Acidic amino acids in EPS can not only promote the leaching of Ca2+, but also adsorb free water in the system. Consequently, EPS may provide more nucleation sites, inducing the in-situ generation of amorphous calcium carbonate (ACC), and thus organic-inorganic carbonated composites were formed eventually, which improved the pore structure and carbonation degree of samples. The application of EPS has overcome the influence of unstable enzyme activity during the traditional microbial carbonation, achieving better and more stable carbonation effects.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"731 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144787582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Restoration of hydraulic properties in recycled cement pastes via thermal treatment 通过热处理恢复再生水泥浆的水力性能

Cement and Concrete Composites Pub Date : 2025-07-31 DOI: 10.1016/j.cemconcomp.2025.106265

Abdellatif Abidar, Rabah Hamzaoui, Othmane Bouchenafa, Sandrine Mansoutre, Céline Florence, Michael Paris, Laury Barnes Davin, Claire Capra, Bruno Classen

{"title":"Restoration of hydraulic properties in recycled cement pastes via thermal treatment","authors":"Abdellatif Abidar, Rabah Hamzaoui, Othmane Bouchenafa, Sandrine Mansoutre, Céline Florence, Michael Paris, Laury Barnes Davin, Claire Capra, Bruno Classen","doi":"10.1016/j.cemconcomp.2025.106265","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106265","url":null,"abstract":"The primary objective of this study is to investigate the regeneration of hydraulic properties in hydrated cement pastes through thermal treatment between 400 °C and 800 °C, with a particular focus on the phase transformations and hydration mechanisms of the regenerated binders. This research is part of a broader effort to develop sustainable strategies for concrete recycling within a circular economy framework. Crushed cement paste, previously hydrated for 28 days, was thermally treated and characterized using 29Si nuclear magnetic resonance (NMR) spectroscopy and X-ray diffraction (XRD) combined with Rietveld refinement.Results show that treatment at 600 °C leads to the formation of two C2S polymorphs (α'H-C2S and β-C2S), confirmed by both XRD and 29Si-NMR, associated with the complete decomposition of C–S–H phases. Binder hydration obtained between 600°C and 800°C required more water than ordinary Portland cement, likely due to the high reactivity of the free lime formed during thermal treatment. After 28 days of rehydration, a significant proportion of the belite formed is consumed. These findings demonstrate that heat-treated recycled cement pastes can behave as low-temperature belitic binders, offering a promising low-carbon alternative to conventional clinker production.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144747737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of macro-cell corrosion on reinforced concrete induced by chloride attack 氯离子侵蚀对钢筋混凝土大细胞腐蚀的数值研究

Cement and Concrete Composites Pub Date : 2025-07-30 DOI: 10.1016/j.cemconcomp.2025.106263

Yifang Ji, Zhao Wang, Sho Inose, Satoshi Tsuchiya, Tsutomu Yamamoto, Tetsuya Ishida, Koichi Maekawa

{"title":"Numerical study of macro-cell corrosion on reinforced concrete induced by chloride attack","authors":"Yifang Ji, Zhao Wang, Sho Inose, Satoshi Tsuchiya, Tsutomu Yamamoto, Tetsuya Ishida, Koichi Maekawa","doi":"10.1016/j.cemconcomp.2025.106263","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106263","url":null,"abstract":"Uneven distribution of chloride ions will cause macro-cell corrosion, which is typical but much more severe to reinforced concrete (RC) structures compared to micro-cell corrosion. In order to evaluate the electro-chemical characteristics of such macro-cell corrosion happening in actual RC structures, an integrated numerical platform including the coupled electric and chemical analysis has been developed. The platform had been successfully validated through an artificial electric field induced by external charge to obtain the accelerated macro-cell corrosion within a short period. In this paper, the application of integrated platform is conducted to chloride induced macro-cell corrosion with verification by long-term laboratory tests and in-service infrastructures in terms of the time-dependent chloride profile and corrosion characteristics. In addition, parametric analysis is conducted to further study the influence of chloride distribution as well as oxygen concentration on macro-cell effect. Results show that the uniformity of micro-cell corrosion even within a single rebar is found broken in either laboratory test or actual infrastructures. The polarization creates anode and cathode along the cross section of rebar, which is qualitatively captured by the numerical analysis. Meanwhile, the impact of adjacent rebars on the macro-cell corrosion of certain rebar, as well as the macro-cell properties within one rebar under the effect of single or multiple cover concrete cracks are also discussed in detail.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144747745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Understanding the role of polyepoxysuccinic acid in one-part sodium carbonate and carbide slag activated ground granulated blast furnace slag fresh paste 了解聚氧琥珀酸在一份碳酸钠和电石渣活化磨粒高炉渣鲜膏中的作用

Cement and Concrete Composites Pub Date : 2025-07-25 DOI: 10.1016/j.cemconcomp.2025.106253

Kairui Duan, Ze Liu, Xiang Li, Jixiang Wang, Jingshen Zhang, Dongmin Wang

{"title":"Understanding the role of polyepoxysuccinic acid in one-part sodium carbonate and carbide slag activated ground granulated blast furnace slag fresh paste","authors":"Kairui Duan, Ze Liu, Xiang Li, Jixiang Wang, Jingshen Zhang, Dongmin Wang","doi":"10.1016/j.cemconcomp.2025.106253","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106253","url":null,"abstract":"In this study, polyepoxysuccinic acid salt (PESA (Na), P) was employed to enhance the time-dependent flowability of the one-part sodium carbonate and carbide slag activated ground granulated blast furnace slag paste within 60 min. The action mechanism of P with different addition methods was revealed through pore solution chemistry, in-situ XRD, Zeta potential, etc. For the direct addition method, P (0.2 wt% to 0.3 wt%) could adsorb onto the ground granulated blast furnace slag (GBS) and carbide slag (CS), offering dispersibility and inhibiting the dissolution of carbide slag, thereby improving the initial flowability. Then, P lost its dispersible capability because it participated in the formation of calcite and gaylussite, inhibiting the growth of calcite along the (104) crystal plane and leading to the fast consumption of CO32- in the pore solution. 0.4 wt% P retained high CO32- while low OH- during the test period, delaying the chemical reaction between CS and sodium carbonate. For the delayed addition method, 0.1 wt%-0.3 wt% P significantly improved the flowability of the paste under high OH- concentrations within 60 min. In this case, calcite was allowed to precipitate in advance so that P was not consumed by calcite and gaylussite but adsorbed onto chemically inert calcite, GBS, and unreacted CS to provide strong dispersibility. Both addition methods promoted the formation of gaylussite with large molar volumes and a rough appearance, which was detrimental to the flowability. A modelled chemical system comprising \"Na2CO3+Ca(OH)2\" with and without P validated the investigated mechanisms.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of MgAl–NO2-LDHs on passivation of reinforcing steel in simulated geopolymer solution MgAl-NO2-LDHs 对模拟土工聚合物溶液中钢筋钝化的影响

Cement and Concrete Composites Pub Date : 2024-07-25 DOI: 10.1016/j.cemconcomp.2024.105676

Yuchen Wu, Zhipeng Xu, Jiangwei Zhu, Fengjiang Li, Jie Hu, Yuwei Ma, Zuhua Zhang, Haoliang Huang, Jiangxiong Wei, Qijun Yu, Caijun Shi

引用次数: 0