Cement & concrete composites最新文献_第2页

Multiscale pore optimization of UHPC with microcapsules: From nanoscale to macroscale shrinkage regulation 超高性能微胶囊混凝土的多尺度孔隙优化：从纳米尺度到宏观尺度的收缩调节

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-14 DOI: 10.1016/j.cemconcomp.2025.106228

Haonan Zhu , Qinyuan Liang , Deyu Kong , Kui He , Hui Yang

{"title":"Multiscale pore optimization of UHPC with microcapsules: From nanoscale to macroscale shrinkage regulation","authors":"Haonan Zhu , Qinyuan Liang , Deyu Kong , Kui He , Hui Yang","doi":"10.1016/j.cemconcomp.2025.106228","DOIUrl":"10.1016/j.cemconcomp.2025.106228","url":null,"abstract":"<div><div>Superabsorbent polymers (SAP) are widely utilized as internal curing (IC) agents to effectively mitigate the autogenous shrinkage of ultra-high-performance concrete (UHPC). However, the macropores left behind by SAP can pose significant risks to the mechanical properties of UHPC. To address this challenge, this study developed double-emulsion microcapsules with an alkali-sensitive shell, designed to simultaneously achieve reduced shrinkage and enhanced mechanical strength in UHPC. The effects of these microcapsules on hydration, mechanical properties, shrinkage, and the micro- and nano-scale structure of UHPC were systematically investigated. The results revealed that the incorporation of microcapsules substantially reduced autogenous shrinkage while promoting hydration without compromising compressive strength. Specifically, at an optimal microcapsule content of 1.0 %, the autogenous shrinkage rate decreased by 49.5 % compared to UHPC without microcapsules, while the compressive strength remained unaffected. Additionally, the IC process was significantly improved, as evidenced by enhancements in the interfacial transition zone (ITZ) and the mitigation of microcrack development, validated through nanoindentation and X-ray microcomputed tomography (X-ray μCT) analyses. A quantitative method evaluating the fragmentation degree of internal cracks in UHPC is proposed to systematically characterize the impact of microcapsules on IC efficiency, providing theoretical insights into leveraging microcapsule technology to achieve UHPC with low shrinkage and high strength.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106228"},"PeriodicalIF":10.8,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144630169","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

Enhancing nano-CaCO3 dispersion with cellulose nanocrystals for high-strength low-carbon concrete 纤维素纳米晶增强纳米碳酸钙在高强低碳混凝土中的分散

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-14 DOI: 10.1016/j.cemconcomp.2025.106227

Hammad Ahmed Shah , Yuhuan Wang , Nemkumar Banthia , Weina Meng

{"title":"Enhancing nano-CaCO3 dispersion with cellulose nanocrystals for high-strength low-carbon concrete","authors":"Hammad Ahmed Shah , Yuhuan Wang , Nemkumar Banthia , Weina Meng","doi":"10.1016/j.cemconcomp.2025.106227","DOIUrl":"10.1016/j.cemconcomp.2025.106227","url":null,"abstract":"<div><div>To produce low-carbon concrete, nano calcium carbonate (nano-CaCO<sub>3</sub>) has been used as a partial cement replacement to enhance concrete properties through nucleation and filler effects. The nano-CaCO<sub>3</sub> is being synthesized by reacting CO<sub>2</sub> with calcium-rich natural and/or waste materials. However, a critical challenge in this approach is the poor dispersion of nano-CaCO<sub>3</sub> which tends to agglomerate due to van der Waals forces. This agglomeration severely affects the mechanical performance and durability of concrete, particularly at higher dosages.</div><div>This study introduces a novel solution to enhance nano-CaCO<sub>3</sub> dispersion by leveraging cellulose nanocrystals (CNC) and their abundant hydroxyl functional groups. Nano-CaCO<sub>3</sub> was synthesized via the carbonation of calcium hydroxide (Ca(OH)<sub>2</sub>) suspension in the presence of CNC and incorporated into cement paste at up to 0.9 % replacement. The results demonstrate significant advancements: (1) CNC markedly improves nano-CaCO<sub>3</sub> dispersion in both water and cement paste; (2) CNC-incorporated synthesis reduces nano-CaCO<sub>3</sub> crystallinity which may provide more nucleation sites due to higher surface area; (3) while pure calcite forms in the absence of CNC, its presence promotes additional polymorphs, including aragonite and vaterite, and (4) well-dispersed nano-CaCO<sub>3</sub> achieved with CNC leads to a substantial 52 % increase in compressive strength and a 30 % increase in flexural strength. This research introduces an innovative strategy to overcome nano-CaCO<sub>3</sub> dispersion challenges for scaling production, enabling its effective use in cementitious materials and significantly enhancing concrete performance.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106227"},"PeriodicalIF":10.8,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622491","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

Fire-and-corrosion resistance dual-functional EGC coatings: Design and performance characterization 防火和耐腐蚀双功能EGC涂层：设计和性能表征

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-14 DOI: 10.1016/j.cemconcomp.2025.106229

Fei Wang , Yao Ding , Xinjian Sun , Neven Ukrainczyk , Jiangtao Yu , Kequan Yu

{"title":"Fire-and-corrosion resistance dual-functional EGC coatings: Design and performance characterization","authors":"Fei Wang , Yao Ding , Xinjian Sun , Neven Ukrainczyk , Jiangtao Yu , Kequan Yu","doi":"10.1016/j.cemconcomp.2025.106229","DOIUrl":"10.1016/j.cemconcomp.2025.106229","url":null,"abstract":"<div><div>Fire and corrosion are two fatal threats to steel structures, while the current fireproof and anti-corrosion measures for steel structures are implemented separately, resulting in multiple interfaces and complex protection systems. This study, therefore, is dedicated to developing an integrated fire-and-corrosion resistance coating for steel structures. A novel coating made from engineered geopolymer composites (EGC) with ultra-high ductility is designed to simultaneously provide fire and corrosion protection for steel structures. The feasibility of EGC as a coating agent was rigorously evaluated through analyses of its workability, mechanical properties, thermal performance, chloride resistance, and microscopic characteristics. The results indicated that EGC effectively met both short- and long-term operational requirements for coatings. EGC demonstrated significantly superior specific strengths (strength-to-mass ratio), lower thermal conductivity, and lower chloride diffusion coefficient than those of conventional cement-based coatings. It owns steel-like tensile ductility (exceeding 9 %) and excellent crack-width control ability, promising superior deformation compatibility under large deformation and desirable thermal/corrosion resistance. Additionally, the energy consumption and carbon emission of EGC decreased by 43 % and 82 %, respectively, compared to traditional cement-based coatings. Capitalizing on the inherent fire resistance of geopolymer, alone with its high ductility, superior crack-control ability, exceptional thermal insulation and chloride resistance abilities, EGC emerges as a highly promising material for fire and corrosion protection applications, offering a sustainable and efficient solution for protective coatings in steel structures.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106229"},"PeriodicalIF":10.8,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144630165","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

Multi-agent collaboration for knowledge-guided data-driven design of ultra-high-performance concrete (UHPC) incorporating solid wastes 包含固体废物的高性能混凝土（UHPC）的知识引导数据驱动设计的多智能体协作

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-14 DOI: 10.1016/j.cemconcomp.2025.106230

Pengwei Guo, Zhan Jiang, Weina Meng, Yi Bao

{"title":"Multi-agent collaboration for knowledge-guided data-driven design of ultra-high-performance concrete (UHPC) incorporating solid wastes","authors":"Pengwei Guo, Zhan Jiang, Weina Meng, Yi Bao","doi":"10.1016/j.cemconcomp.2025.106230","DOIUrl":"10.1016/j.cemconcomp.2025.106230","url":null,"abstract":"<div><div>Data-driven design of concrete attracts increasing interests in waste valorization and decarbonization but lacks generalizability and reliability without concrete domain knowledge. Recent research suggests that knowledge graphs are promising for imparting concrete knowledge into data-driven design, yet manual construction of knowledge graphs is inefficient and hard to scale. This paper presents a multi-agent collaboration framework to streamline knowledge-guided data-driven design of green concrete. The framework decentralize design tasks among specialized agents, and a large language model-based approach is developed to automate the extraction of concrete knowledge for constructing concrete knowledge graphs. The framework has been applied to create a knowledge graph and design green ultra-high-performance concrete (UHPC). The primary novelties of this research involve the multi-agent collaboration framework for designing UHPC and the automatic extraction of UHPC knowledge for constructing the knowledge graph. Results show that concrete knowledge is imparted into data-driven design of UHPC and enables explicit interpretation of machine learning outcomes regarding physical and chemical mechanisms, advancing the transition from purely data-driven to knowledge-guided design of eco-friendly composite materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106230"},"PeriodicalIF":10.8,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622440","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 macro polyoxymethylene fiber on the flexural behavior of concrete beam under cyclic loading and the potential for self-monitoring of crack development 宏聚甲醛纤维对循环荷载下混凝土梁受弯性能的影响及裂缝发展的自监测潜力

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-10 DOI: 10.1016/j.cemconcomp.2025.106225

Wei Guo , Yining Ding , Norbert Randl

{"title":"Effect of macro polyoxymethylene fiber on the flexural behavior of concrete beam under cyclic loading and the potential for self-monitoring of crack development","authors":"Wei Guo , Yining Ding , Norbert Randl","doi":"10.1016/j.cemconcomp.2025.106225","DOIUrl":"10.1016/j.cemconcomp.2025.106225","url":null,"abstract":"<div><div>This work investigates the mechanical properties and crack self-sensing behavior of polyoxymethylene (POM) fiber reinforced concrete (POMFRC) with nano-carbon powder (NCP) under monotonic and cyclic bending. Cyclic bending tests are conducted on notched beams, and the fractional change in resistance (FCR) is measured to enable real-time crack monitoring. The effects of varying macro POM fiber and NCP dosages on the mechanical properties and self-sensing sensitivity of POMFRC are analyzed. The relationships between deflection, crack mouth opening displacement (CMOD), and FCR are examined under both monotonic and cyclic loading conditions. Results reveal that POM fibers greatly improve post-cracking performance, while NCP enhances self-sensing sensitivity; on average, 1 kg/m<sup>3</sup> NCP enhances the FCR value at a 1 mm deflection by 61.1 %. For the first time, the self-sensing of concrete cracks subjected to cyclic loading is explored. From the first loading-unloading cycle, the variation in FCR shows a similar trend to that of CMOD. After concrete cracking, both FCR and CMOD increase or decrease simultaneously during loading and unloading, which reflects a positive correlation in the post-cracking stage. A linear model derived from monotonic test data offers a simple and practical approach for preliminary prediction of the FCR-CMOD relationships under cyclic bending, providing conservative and reliable estimates of crack opening.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106225"},"PeriodicalIF":10.8,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594698","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

Carbonation induced changes in the mechanical performance, water and chloride permeability of Portland cement-slag-limestone ternary cement concretes 碳化引起硅酸盐水泥-矿渣-石灰石三元水泥混凝土力学性能、水渗透性和氯离子渗透性的变化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-09 DOI: 10.1016/j.cemconcomp.2025.106222

Moro Sabtiwu , Yuvaraj Dhandapani , Michal Drewniok , Samuel Adu-Amankwah , Susan A. Bernal

{"title":"Carbonation induced changes in the mechanical performance, water and chloride permeability of Portland cement-slag-limestone ternary cement concretes","authors":"Moro Sabtiwu , Yuvaraj Dhandapani , Michal Drewniok , Samuel Adu-Amankwah , Susan A. Bernal","doi":"10.1016/j.cemconcomp.2025.106222","DOIUrl":"10.1016/j.cemconcomp.2025.106222","url":null,"abstract":"<div><div>Carbonation and chloride-induced deterioration of reinforced concrete can cause infrastructure damage and potential collapse. This study evaluated the impact of carbonation on compressive strength, dimensional stability, water and chloride permeability of concretes made with ternary slag cement containing 10 or 20 wt.% limestone, compared to ground granulated blast furnace slag (GGBFS) blended cement or CEM I. The carbonation rates of binary and ternary concretes were higher than those of CEM I concrete. The existing equation correlating natural and accelerated carbonation coefficients holds for the concretes evaluated and the selected carbonation exposure condition studied. The carbonation depths estimated adopting this correlation are within the limits of the cover depths recommended by the BS 8500–1:2023 for concretes for a 50 years’ service life, when exposed to exposure classes XC3/XC4. Despite the higher carbonation rates, water and chloride permeability of the carbonated ternary and binary slag cement concretes were significantly lower than those of a CEM I equivalent. No clear correlation was identified between compressive strength, porosity, bulk conductivity, water sorption coefficient and carbonation rate. Each of these properties alone did not give a good indication of the overall durability performance of binary or ternary concretes. The results demonstrate that 10 % limestone addition has no adverse effect on carbonation resistance of composite cement concrete. Therefore, it is demonstrated that partial replacement of GGBFS by limestone is a practical and technically sound solution for producing concrete with a reduced clinker content and comparable durability to CEM I or binary GGBFS concretes.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106222"},"PeriodicalIF":10.8,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586737","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

Influence of graphene on calcium leaching in fibre reinforced cementitious mixes under impressed current cathodic protection 外加电流阴极保护下石墨烯对纤维增强胶凝料中钙浸出的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-09 DOI: 10.1016/j.cemconcomp.2025.106226

Nguyen Tien Dung , Meini Su , Yong Wang , Cise Unluer

{"title":"Influence of graphene on calcium leaching in fibre reinforced cementitious mixes under impressed current cathodic protection","authors":"Nguyen Tien Dung , Meini Su , Yong Wang , Cise Unluer","doi":"10.1016/j.cemconcomp.2025.106226","DOIUrl":"10.1016/j.cemconcomp.2025.106226","url":null,"abstract":"<div><div>Anode acidification at the fibre/mortar interface challenges the durability of Fibre-Reinforced Cementitious Matrix (FRCM) composites in Impressed Current Cathodic Protection (ICCP) systems. This study examined the addition of 0.035–0.07 % graphene to FRCM composites, focusing on its role in phase formation, calcium leaching mitigation, and structural performance under electrochemical conditions. Graphene enhanced the formation of portlandite and C-S-H, densified the microstructure, and improved electrical conductivity, leading to reduced degradation and more uniform ion redistribution. Under current densities of 0.05–0.5 A/m<sup>2</sup>, graphene promoted the dissolution of unhydrated cement, rather than hydrated cement products, facilitating a continuous flow of cations and electrons. Thus, graphene-incorporated specimens exhibited delayed failure points and doubled the service life compared to controls. These findings demonstrated graphene's potential to reduce maintenance needs and material usage by up to 50 %, offering significant economic savings and sustainability benefits for ICCP systems.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106226"},"PeriodicalIF":10.8,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144586736","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 in-situ alkali activator treatment of polypropylene fiber on the corrosion resistance of geopolymer coatings: test and mechanistic analysis 聚丙烯纤维原位碱活化剂处理对地聚合物涂层耐腐蚀性能的影响：试验及机理分析

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-08 DOI: 10.1016/j.cemconcomp.2025.106223

Yingwu Zhou , Sheng Jin , Ying Yu , Menghuan Guo , Ben Li

{"title":"Effect of in-situ alkali activator treatment of polypropylene fiber on the corrosion resistance of geopolymer coatings: test and mechanistic analysis","authors":"Yingwu Zhou , Sheng Jin , Ying Yu , Menghuan Guo , Ben Li","doi":"10.1016/j.cemconcomp.2025.106223","DOIUrl":"10.1016/j.cemconcomp.2025.106223","url":null,"abstract":"<div><div>This study addresses crack propagation-induced corrosion resistance degradation in geopolymers. Although economical polypropylene (PP) fibers demonstrate crack mitigation potential, their poor dispersion and weak interfacial bonding with the geopolymer matrix limit their performance. To overcome this issue, PP fibers were treated via an in-situ alkali activation process to form a surface-deposited inorganic layer that improved fiber dispersion and interfacial adhesion. A systematic evaluation of the fiber modification degree and dosage revealed that the optimal modified fiber content of 0.4 wt% (MPFGC0.4) resulted in substantial improvements versus unmodified counterparts: an 18.8 % increase in compressive strength, 8.1 % flexural strength enhancement, 42.5 % water absorption reduction, and a 67.8 % decrease in the chloride diffusion coefficient. The microstructural analysis confirmed that SiO<sub>4</sub><sup>4-</sup> species and inorganic groups on fiber surfaces optimize fiber dispersion and enhance bonding with the matrix. As a steel coating, the modified geopolymer exhibited the lowest mass loss ratio after salt-spray testing, with the profilometric analysis verifying improved fracture resistance. This work advances corrosion-resistant coating strategies for reinforced concrete in aggressive service environments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106223"},"PeriodicalIF":10.8,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144578149","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

Temperature correction protocol for in-situ monitoring of concrete during the curing and post-curing periods: application to low carbon concrete 混凝土养护和养护后现场监测的温度校正方案：在低碳混凝土中的应用

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-08 DOI: 10.1016/j.cemconcomp.2025.106224

B. Suryanto , G. Starrs , A. Tambusay , E. Clark , J. Kim

{"title":"Temperature correction protocol for in-situ monitoring of concrete during the curing and post-curing periods: application to low carbon concrete","authors":"B. Suryanto , G. Starrs , A. Tambusay , E. Clark , J. Kim","doi":"10.1016/j.cemconcomp.2025.106224","DOIUrl":"10.1016/j.cemconcomp.2025.106224","url":null,"abstract":"<div><div>The long-term performance of concrete depends primarily on the exposure and prevailing climatic conditions, with temperature during the initial curing period playing an important role in determining concrete strength development and durability characteristics. This paper presents the use of electrical property measurements as a potential testing methodology for assessing the relative performance of concrete subjected to varying field temperature conditions and constant laboratory temperatures. It introduces a new temperature correction procedure to facilitate such assessments to be conducted both during and beyond the standard curing period, building upon earlier work that focused on mature concrete. To this end, test data are presented for low-carbon concrete mixes incorporating binary and ternary binders, including Portland cement, ground granulated blast-furnace slag, and limestone powder. The parameter normalized resistivity is presented to highlight the influence of temperature on hydration and microstructural development across a range of low-carbon concrete mixes. The work presented reveals that the activation energy of electrical conduction is binder specific and increases with time during the initial five months after casting, with values ranging from 13 to 31 kJ/mol (0.14–0.32 eV/ion). Concrete with high levels of cement replacement exhibits a gradual increase in activation energy, eventually achieving higher values than plain Portland cement concrete. This indicates a more disconnected and tortuous pore network. However, when subjected to temperatures below 20<sup>o</sup>C, the progression of pore structure development in such concrete is notably much slower. The work presented also shows that electrical measurements are technically straightforward to undertake and ideally suited for in-situ monitoring of concrete.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106224"},"PeriodicalIF":10.8,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144578152","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

Synthesis of low-carbon alkali-activated materials using carbonated recycled concrete fines with sodium meta-aluminate 用中铝酸钠碳化再生混凝土细粉合成低碳碱活性材料

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-07 DOI: 10.1016/j.cemconcomp.2025.106211

Weiwei Chen, Peiliang Shen, Qinglong Qin, Yong Tao, Chi Sun Poon

{"title":"Synthesis of low-carbon alkali-activated materials using carbonated recycled concrete fines with sodium meta-aluminate","authors":"Weiwei Chen, Peiliang Shen, Qinglong Qin, Yong Tao, Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106211","DOIUrl":"10.1016/j.cemconcomp.2025.106211","url":null,"abstract":"<div><div>This paper reports the synthesis of a novel low-carbon alkali-activated material system to fully utilise the reaction potential of carbonated recycled concrete fines. The hydration mechanism and strength source of the alkali-activated carbonated recycled concrete fines (AACRCF) system are systematically investigated. The results indicate that the AACRCF paste can pose competent hardening properties comparable to OPC, with 28-day compressive strengths reaching up to 25 MPa and 90 MPa at W/S ratios of 0.5 and 0.2, respectively. The hydration of the AACRCF system typically exhibits characteristics of high kinetics and low reaction heat release, mainly including the carbo-aluminate reaction and alkali-activation reaction, which convert the calcium carbonate and silica-alumina gels in CRCF into monocarboaluminate and C-N-A-S-H gels. The strength of this system mainly comes from its crystalline phase rather than the gel phase. Overall, the utilisation of the AACRCF system can considerably reduce carbon emission, resulting in significant environmental benefits.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"163 ","pages":"Article 106211"},"PeriodicalIF":10.8,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144568997","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