Cement & concrete composites最新文献_第3页

New insights on thaumasite precipitation based on thermodynamic modeling and 3-year exposure of cement pastes to Na2SO4 and MgSO4 solutions 基于热力学模型和水泥浆在Na2SO4和MgSO4溶液中曝晒3年的研究对硫马石沉淀的新见解

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-11 DOI: 10.1016/j.cemconcomp.2025.106190

Shintaro Miyamoto , Yuichiro Kawabata , Natsuki Yoshida , Marcus H.N. Yio , Tsuyoshi Saito , Hong S. Wong

{"title":"New insights on thaumasite precipitation based on thermodynamic modeling and 3-year exposure of cement pastes to Na2SO4 and MgSO4 solutions","authors":"Shintaro Miyamoto , Yuichiro Kawabata , Natsuki Yoshida , Marcus H.N. Yio , Tsuyoshi Saito , Hong S. Wong","doi":"10.1016/j.cemconcomp.2025.106190","DOIUrl":"10.1016/j.cemconcomp.2025.106190","url":null,"abstract":"<div><div>Cement pastes were exposed to 0.10 mol/L Na<sub>2</sub>SO<sub>4</sub> and MgSO<sub>4</sub> solutions at 20 °C for over three years to investigate the precipitation mechanism of thaumasite and the associated phase evolution. Powder X-ray diffraction, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy show that samples exposed to MgSO<sub>4</sub> have lower contents of portlandite, calcite, and C-S-H, compared to those exposed to Na<sub>2</sub>SO<sub>4</sub>. In addition, samples exposed to MgSO<sub>4</sub> contained significant amounts of thaumasite and brucite. Ettringite content is comparable in both conditions, but thaumasite is not detectable in samples exposed to Na<sub>2</sub>SO<sub>4</sub>. This difference can be attributed to the higher degree of supersaturation of thaumasite in samples exposed to MgSO<sub>4</sub> compared to Na<sub>2</sub>SO<sub>4</sub>. Thermodynamic modelling was carried out to validate this hypothesis and the predicted phase assemblages show good consistency with experiments. By introducing a critical supersaturation into the thermodynamic phase equilibrium calculations, the model successfully reproduced the selective precipitation of thaumasite in samples exposed to MgSO<sub>4</sub>.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106190"},"PeriodicalIF":10.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144269037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving instantaneous activation of recycled concrete powder by hyper-gravity carbonation 利用超重力碳化实现再生混凝土粉的瞬时活化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106177

Zhenjiang Gu, Long Jiang, Zihan Ma, Yi Jiang, Peiliang Shen, Chi Sun Poon

引用次数: 0

Production of carbonates calcined clay cement composites via CO2-assisted vigorous stirring 二氧化碳辅助强力搅拌生产碳酸盐煅烧粘土水泥复合材料

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106181

Yingliang Zhao , Yong Zheng , Jionghuang He , Kai Cui , Peiliang Shen , Guangmin Peng , Ruilai Guo , Daohui Xia , Chi Sun Poon

{"title":"Production of carbonates calcined clay cement composites via CO2-assisted vigorous stirring","authors":"Yingliang Zhao , Yong Zheng , Jionghuang He , Kai Cui , Peiliang Shen , Guangmin Peng , Ruilai Guo , Daohui Xia , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106181","DOIUrl":"10.1016/j.cemconcomp.2025.106181","url":null,"abstract":"<div><div>Limestone calcined clay cement (LC3) offers a promising approach to reducing CO<sub>2</sub> emissions in the construction industry. However, the early-age compressive strength of LC3 is notably low, primarily due to the high clinker substitution level. This study introduces an innovative carbonate-activated calcined clay cement system, termed C4, produced through a two-step process: pretreating metakaolin (MK) and carbide slag (CS) via CO<sub>2</sub>-assisted vigorous stirring (CAVS), followed by mixing with cement. C4 demonstrated significant improvements in compressive strength, exhibiting increases of over 300 % at 1 day and 60 % at 28 days compared to LC3. These values also exceeded those of ordinary Portland cement (OPC) by 12.7 % and 8.6 %, respectively. The enhanced performance of C4 can be attributed to particle size refinement, structural modification, and phase transformation induced by the CAVS process. These changes facilitated the formation of C-(A)-S-H, which served as nucleation sites, thereby accelerating hydration reactions in C4. Additionally, the CAVS process improved the reactivity of MK by increasing its surface area and generating more active sites for reaction. Furthermore, the calcium carbonate derived from CS carbonation during CAVS exhibited higher reactivity than the calcite present in limestone, promoting monocarbonate precipitation. Collectively, these factors contributed to a denser microstructure, enhancing compressive strength development.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106181"},"PeriodicalIF":10.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144260354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of graphene nanoplatelets on the temperature time-delay response of PCM-enhanced concrete in subzero climates 石墨烯纳米片对低温条件下pcm增强混凝土温度延迟响应的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106186

Muhammad Zeeshan Haider , Xinghan Jin , Syed Nayyar Raza Naqvi , Jong Wan Hu

{"title":"Effect of graphene nanoplatelets on the temperature time-delay response of PCM-enhanced concrete in subzero climates","authors":"Muhammad Zeeshan Haider , Xinghan Jin , Syed Nayyar Raza Naqvi , Jong Wan Hu","doi":"10.1016/j.cemconcomp.2025.106186","DOIUrl":"10.1016/j.cemconcomp.2025.106186","url":null,"abstract":"<div><div>This study investigates the thermal enhancement of phase change material (PCM) incorporated concrete using graphene nanoplatelets (GNPs) for low-temperature applications. While previous research has explored PCM-impregnated lightweight aggregates (PCM-LWAs) for thermal regulation in concrete, the low thermal conductivity and supercooling behavior of PCMs remain critical challenges. This study addresses these gaps by proposing a novel and practical approach by incorporating GNPs directly into the cementitious matrix of PCM-LWA concrete to improve both thermal and mechanical performance. Expanded clay and scoria LWAs, with PCM absorption capacities of 50 % and 23 % by weight respectively, were used as PCM carriers. The PCM-LWA composites were coated to prevent leakage and integrated into concrete specimens reinforced with GNPs at 0.05 %, 0.10 %, and 0.15 % by binder weight. Differential scanning calorimetry (DSC) revealed melting and freezing enthalpies of 97.57 J/g and 96.92 J/g for PCM-EC, and 35.88 J/g and 35.42 J/g for PCM-S. Compressive strength tests showed strength degradation in PCM concrete due to the low stiffness of LWAs; however, GNP addition mitigated this degradation, with the highest improvement observed at 0.15 % GNP. Thermal cycling tests demonstrated that GNP-enhanced PCM concrete exhibited increased time delay and improved thermal stability. Specimens E−15G and S-15G maintained higher internal temperatures and demonstrated sustained performance under repeated thermal cycles. The addition of 0.15 % GNP improved the time delay response of PCM-EC and PCM-S concrete specimens by up to 72 % and 32 %, respectively. This highlights the potential of GNPs in enhancing the thermal performance of PCM concrete for low-temperature applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106186"},"PeriodicalIF":10.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and performance of 3D printed Bouligand steel fiber-reinforced cementitious composite curved beams 3D打印Bouligand钢纤维增强胶凝复合材料弯曲梁的设计与性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106188

Shuai Li , Junli Liu , Chi-Tsun Cheng , H. Nguyen-Xuan , Phuong Tran

引用次数: 0

Towards net-zero reinforced concrete: A critical review 迈向净零钢筋混凝土：一个重要的回顾

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106187

Renjie Mi, Sripriya Rengaraju, Abir Ai-Tabbaa

{"title":"Towards net-zero reinforced concrete: A critical review","authors":"Renjie Mi, Sripriya Rengaraju, Abir Ai-Tabbaa","doi":"10.1016/j.cemconcomp.2025.106187","DOIUrl":"10.1016/j.cemconcomp.2025.106187","url":null,"abstract":"<div><div>This paper reviews the efficiency of approximately 150 net-zero strategies for reinforced concrete, based on around 180 references. These strategies cover raw materials, manufacturing, transportation, construction, carbon calculation, standards, and projects/applications. The results show that CO<sub>2</sub> emissions from cement can be reduced by 6 % to 70 % by developing low-carbon cement, such as geopolymer cement and calcined clay-limestone cement. A significant amount of CO<sub>2</sub> can be sequestered in the final cement pastes and aggregates through CO<sub>2</sub> curing. In some specific applications, CO<sub>2</sub> emissions from steel reinforcement can be reduced by approximately 90 % by using fibre-reinforced polymer bars. Optimising energy sources and processes during manufacturing and transportation can reduce CO<sub>2</sub> emissions by up to 90 %, while employing 3D printing technology can cut CO<sub>2</sub> emissions by up to 25 % compared to traditional cast-in-situ construction. Therefore, achieving the net-zero target is nearly feasible separately for cement and steel reinforcement with the use of specific technologies. Further work should explore the feasibility of coupling these net-zero strategies in reinforced concrete, considering its long-term mechanical properties and durability.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106187"},"PeriodicalIF":10.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CO2-induced changes in rheology, structural evolution, and particle characteristics of cement paste 二氧化碳对水泥浆体流变、结构演化和颗粒特性的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-10 DOI: 10.1016/j.cemconcomp.2025.106180

Seongho Han , Tae Yong Shin , Seung Mo Kim , Jae Hong Kim , Kamal H. Khayat

{"title":"CO2-induced changes in rheology, structural evolution, and particle characteristics of cement paste","authors":"Seongho Han , Tae Yong Shin , Seung Mo Kim , Jae Hong Kim , Kamal H. Khayat","doi":"10.1016/j.cemconcomp.2025.106180","DOIUrl":"10.1016/j.cemconcomp.2025.106180","url":null,"abstract":"<div><div>The injection of carbon dioxide (CO<sub>2</sub>) into cementitious systems has emerged as a promising approach to enhancing sustainability in concrete production. This study explores the impact of CO<sub>2</sub> injection on the rheological behavior, structural build-up, and particle size evolution of cement paste by systematically varying the water-to-cement ratio (w/c) (0.35, 0.4, and 0.5) and CO<sub>2</sub> concentration (0.06, 0.28, and 0.84 mol). Rheological analysis revealed a significant increase in initial yield stress with CO<sub>2</sub> injection. Using the Modified Bingham model, yield stress increased by 72 % and 150 % for 0.28- and 0.84-mol CO<sub>2</sub>, respectively, while the Herschel-Bulkley model indicated corresponding increases of 31 % and 76 %. Structural build-up rates also exhibited substantial enhancement, reaching 23 Pa/min for 0.28-mol CO<sub>2</sub> and 106 Pa/min for 0.84-mol CO<sub>2</sub>, whereas negligible changes were observed in CO<sub>2</sub>-free samples. Note that lower w/c (e.g., 0.35) demonstrated superior rheological improvements, with a 310 % increase in yield stress, highlighting the role of free water in facilitating carbonation reactions. Shear-thinning behavior intensified with CO<sub>2</sub> injection, particularly at low shear rates (10<sup>−2</sup> to 10<sup>−1</sup> s<sup>−1</sup>), while viscosity changes diminished at higher shear rates (10<sup>1</sup> to 10<sup>3</sup> s<sup>−1</sup>) due to particle network disruption. Slump flow tests further confirmed alterations in flow characteristics following CO<sub>2</sub> injection. Analytical techniques, including multiple light scattering, X-ray diffraction (XRD), and thermogravimetric analysis (TG), indicated the formation of CaCO<sub>3</sub> in the form of aragonite and calcite, contributing to particle agglomeration and enhanced stability.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106180"},"PeriodicalIF":10.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144252443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterizing the thermal properties of polymer concrete at elevated temperatures 表征高温下聚合物混凝土的热性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-09 DOI: 10.1016/j.cemconcomp.2025.106175

Manish Sah , Venkatesh Kodur , Ahmed Almaadawy , Srishti Banerji

{"title":"Characterizing the thermal properties of polymer concrete at elevated temperatures","authors":"Manish Sah , Venkatesh Kodur , Ahmed Almaadawy , Srishti Banerji","doi":"10.1016/j.cemconcomp.2025.106175","DOIUrl":"10.1016/j.cemconcomp.2025.106175","url":null,"abstract":"<div><div>In recent years, there has been growing interest in the use of polymer concrete in construction applications to address sustainability and durability issues. However, there is limited information on the fire performance of polymer concrete. For this purpose, thermal property tests were conducted on different types of polymer concrete (PC) and polymer-modified concrete (PMC) specimens to measure thermal conductivity, specific heat, mass loss, and thermal expansion in the temperature range of 20 °C–600 °C. Data from the tests indicate that the thermal properties of PC are significantly different from that of conventional concrete specifically beyond 200 °C. A notable increase in thermal conductivity and a decrease in specific heat capacity above 200 °C, along with an increase in thermal expansion beyond 300 °C, suggests accelerated thermal degradation of the polymer matrix in PC. In contrast, the thermal properties of PMC are closer to those of conventional concrete till about 600 °C. This behavior indicates that PMC exhibits greater thermal stability at elevated temperatures as compared to PC, making it more suitable for fire-related applications. The evaluated test data are utilized to propose temperature dependent relations for thermal conductivity, specific heat, mass loss, and thermal expansion of PC and PMC. The proposed relations can be incorporated into a numerical model for evaluating the thermal response of PC and PMC structures.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106175"},"PeriodicalIF":10.8,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144243382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface energy and microstructural analyses of novel highly hydrophobic magnesium phosphate cement coatings 新型高疏水性磷酸镁水泥涂料的表面能和微观结构分析

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-06 DOI: 10.1016/j.cemconcomp.2025.106168

Xin Wang , Amani Khaskhoussi , Xiang Hu , Jianming Yang , Caijun Shi

{"title":"Surface energy and microstructural analyses of novel highly hydrophobic magnesium phosphate cement coatings","authors":"Xin Wang , Amani Khaskhoussi , Xiang Hu , Jianming Yang , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106168","DOIUrl":"10.1016/j.cemconcomp.2025.106168","url":null,"abstract":"<div><div>Magnesium phosphate cement (MPC) has attracted attention as a green coating material owing to its excellent adhesion and dense structure. However, MPC's natural hydrophilicity and poor water stability make it susceptible to infiltration by water containing harmful ions, limiting its application as a coating material. This study investigates the effect of polydimethylsiloxane (PDMS) on the wettability of MPC coatings with hierarchical structures. The chemical functional groups and surface morphologies of PDMS-modified MPC coatings were analyzed. The surface free energy of MPC surface was evaluated to understand the physicochemical properties of MPC surface. Static contact angles of MPC coatings with varying PDMS contents were measured using four polar and non-polar liquids. The most important and widely used models were applied to calculate the surface free energy of MPC coatings, assessing the suitability of each model. Wetting envelopes were constructed for the various surfaces to predict the wettability of the MPC with commonly employed liquids. The results indicate that the addition of PDMS successfully transformed MPC from hydrophilic to highly hydrophobic. The improvement in water repellency is due to the cross-linking reaction between PDMS and MPC, which lowers the surface energy through chemical modification. Additionally, the formation of hierarchical structures increases surface roughness, further improving hydrophobicity. Envelope curves were successfully designed to predict the wettability of the coating across a large range of liquids.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106168"},"PeriodicalIF":10.8,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144229008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of calcium sulfoaluminate foamed concrete by carbon dioxide foam: hydration activation and pore structure optimization 二氧化碳泡沫改性硫铝酸钙泡沫混凝土：水化活化及孔隙结构优化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-06-04 DOI: 10.1016/j.cemconcomp.2025.106162

Linbo Jiang, Zhi Wang, Yuan Wang, Jinghang Niu

{"title":"Improvement of calcium sulfoaluminate foamed concrete by carbon dioxide foam: hydration activation and pore structure optimization","authors":"Linbo Jiang, Zhi Wang, Yuan Wang, Jinghang Niu","doi":"10.1016/j.cemconcomp.2025.106162","DOIUrl":"10.1016/j.cemconcomp.2025.106162","url":null,"abstract":"<div><div>This study leverages the low-alkali, early-strength, and rapid-setting properties of CSA to develop a foamed concrete utilizing CO<sub>2</sub> foam. The results indicate that in comparison to CSA prepared using air foam, the 1 d compressive strength of the formulation with CO<sub>2</sub> foam shows an increase of 31 %. Furthermore, when compared to OPC produced with air foam, this strength enhancement reaches up to 74 %. Notably, strength development predominantly occurs within 7 d. This enhanced early strength can be attributed to the role of CO<sub>2</sub> in promoting hydration reactions of calcium sulfoaluminate, which facilitates nearly complete hydration and substantially elevates ettringite content. However, excessive amounts of CO<sub>2</sub> may lead to over-consumption of ettringite, which could adversely affect the rate at which strength develops. The incorporation of CO<sub>2</sub> foam significantly reduces the connectivity and permeability coefficient within the foamed concrete, thereby lowering both thermal conductivity and water absorption rates.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106162"},"PeriodicalIF":10.8,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144219412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0