Cement and Concrete Composites最新文献

Quantitative Analysis of Pore Structures and Microcracks in Self-Healing Concrete after Freeze-Thaw Exposure: An X-Ray Computed Tomography-based Approach 冻融暴露后自愈混凝土孔隙结构和微裂缝的定量分析：基于x射线计算机层析成像的方法

Cement and Concrete Composites Pub Date : 2025-05-05 DOI: 10.1016/j.cemconcomp.2025.106105

Jialuo He, Yong Deng, Xianming Shi

{"title":"Quantitative Analysis of Pore Structures and Microcracks in Self-Healing Concrete after Freeze-Thaw Exposure: An X-Ray Computed Tomography-based Approach","authors":"Jialuo He, Yong Deng, Xianming Shi","doi":"10.1016/j.cemconcomp.2025.106105","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106105","url":null,"abstract":"X-ray computed tomography (CT) is a valuable tool for investigating the microstructure of concrete. This study introduces a method for analyzing the pore structures and microcracks of self-healing concrete after 300 freeze/thaw (F/T) cycles using CT images with a relatively low resolution of 18.08 μm. Urea-formaldehyde microcapsules alone and in combination with polyvinyl alcohol microfibers were able to reduce 39.1% and 65.5% of the microcracks, respectively. Our approach involves calculating the total porosity and identifying constituents within the damaged pore structure based on geometric characteristics, employing the concepts of both circularity and roundness to discriminate intact pores, microcracks, and small/large-size pores with microcracks. The method’s reliability is validated by comparing the total porosity results with the mercury intrusion porosimetry data. Our approach provides an effective tool for quantitative evaluation of the microstructure of self-healing concrete under freeze-thaw conditions, paving the way for more efficient and cost-effective analyses of concrete durability.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909912","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

Investigation of fracture property of the fiber-reinforced cementitious composites casted using a novel fiber orientation method 新型纤维取向法铸造纤维增强胶凝复合材料断裂性能研究

Cement and Concrete Composites Pub Date : 2025-05-05 DOI: 10.1016/j.cemconcomp.2025.106111

Honglei Chang, Zihang Kong, Shuyuan Fan, Yuxi Cai, Feng Guo, Qianping Ran, Hongzhi Zhang, Pan Feng

{"title":"Investigation of fracture property of the fiber-reinforced cementitious composites casted using a novel fiber orientation method","authors":"Honglei Chang, Zihang Kong, Shuyuan Fan, Yuxi Cai, Feng Guo, Qianping Ran, Hongzhi Zhang, Pan Feng","doi":"10.1016/j.cemconcomp.2025.106111","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106111","url":null,"abstract":"Fiber-reinforced cementitious composites (FRCC) exhibit enhanced mechanical properties when fibers are uniformly dispersed and aligned parallel to the principal stress direction. This study introduces a novel fiber-ball vibration method to improve fiber orientation in FRCC. The fracture performance of FRCC prepared with this method was evaluated, and the fiber distribution within the matrix was analyzed in relation to the fiber orientation factor and fracture performance. Additionally, the interfacial transition zone (ITZ) between the fiber-balls and the paste was characterized, revealing the mechanisms through which the fiber-ball vibration method influences FRCC fracture performance. Experimental results indicate that the fiber-ball vibration method causes fibers to align more effectively, resulting in a 62.5% increase in the fiber orientation factor along the principal stress direction compared to conventional mixing techniques. FRCC produced by this method demonstrates enhanced fracture performance, with a 26.2% increase in initial crack toughness over plain cement mortar and a 29.8% increase over FRCC fabricated using the conventional mixing method. Furthermore, unstable fracture toughness and fracture energy increased by 40% and 470%, respectively, compared to plain cement mortar, although these enhancements remained lower than those achieved with conventional mixing. The disparity is primarily attributed to the wider ITZ and lower elastic modulus between fiber-balls and paste, stemming from the negative effects of clustering of fibers and the smooth surface of steel balls, which increase the internal vulnerability in internal regions of FRCC. Nevertheless, the fiber-ball vibration method offers a promising approach for orienting fibers in FRCC. With further refinement, this method could achieve even greater toughening effects by optimizing the distribution of fibers along the principal stress direction.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143909838","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

Advanced Industrial-Grade Carbon-Fiber-Reinforced Geopolymer Cement Supercapacitors for Building-Integrated Energy Storage Solutions 用于建筑集成储能解决方案的先进工业级碳纤维增强地聚合物水泥超级电容器

Cement and Concrete Composites Pub Date : 2025-04-29 DOI: 10.1016/j.cemconcomp.2025.106106

Ji-Hua Zhu, Xiangfei Wang, Hongtao Yu, Shuxia Liu, Chun Pei, Feng Xing

{"title":"Advanced Industrial-Grade Carbon-Fiber-Reinforced Geopolymer Cement Supercapacitors for Building-Integrated Energy Storage Solutions","authors":"Ji-Hua Zhu, Xiangfei Wang, Hongtao Yu, Shuxia Liu, Chun Pei, Feng Xing","doi":"10.1016/j.cemconcomp.2025.106106","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106106","url":null,"abstract":"The integration of energy storage capabilities into building materials represents a revolutionary advancement in sustainable energy solutions. This study introduces and explores a carbon-fiber-reinforced cementitious supercapacitor, marking a pioneering step in leveraging construction materials for dual structural and energy storage purposes. Employing geopolymer cement (GC) as a solid electrolyte and polyacrylonitrile (PAN)-based carbon fibers (CFs) as electrode materials, this novel supercapacitor exhibited electrochemical properties superior to those of conventional building materials. Electrochemical modification of CFs proved to be effective in significantly enhancing the performance of the cement-based supercapacitor, with the areal capacitance increasing from 1.6 mF cm−2 to an impressive 86 mF cm−2. The optimized supercapacitor achieved remarkable energy and power densities of 17.2 μWh cm−2 and 600 μW cm−2, respectively, at a current density of 1 mA cm−2. The energy density achieved is comparable to that of cement-based batteries. This innovative approach to supercapacitor fabrication not only validates the potential of supercapacitor technology in augmenting the energy storage capabilities of buildings but also enhances the multifunctionality of carbon-fiber-reinforced cementitious materials. Our findings herald a new era in sustainable construction in which structural integrity and energy efficiency will coalesce, paving the way for the next generation of smart energy-resilient infrastructures.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143889996","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

On the Evolution of Cement Sheath Stress in Wells During Curing 井中水泥环在养护过程中的应力演化研究

Cement and Concrete Composites Pub Date : 2025-04-23 DOI: 10.1016/j.cemconcomp.2025.106102

Anisa Noor Corina, Al Moghadam

{"title":"On the Evolution of Cement Sheath Stress in Wells During Curing","authors":"Anisa Noor Corina, Al Moghadam","doi":"10.1016/j.cemconcomp.2025.106102","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.106102","url":null,"abstract":"Portland Cement in the well construction provides zonal isolation, preventing unwanted fluid migration to shallow aquifers or the surface. Despite its widespread application for well sealing, the evolution of cement sheath stress state during curing is not well-known. The radial stress in the cement sheath is the key parameter behind the formation of microannuli, a continuous fracture-like feature at the cement sheath’s interface that can become a leakage pathway. In this work, we developed an experimental setup to measure the evolution of stress and pore pressure of a cement sheath. The experiments simulate a cement sheath placed next to an impermeable formation, such as a caprock. Two different axial boundary conditions of plane stress and plane strain were considered. The results show that pore pressure loss due to water consumption by cement clinker hydration occurs at a faster rate for the plane strain condition than the plane stress. Due to the poromechanical properties of cement, the drop in pore pressure also reduces the stress at the inner and outer interfaces of a cement sheath. An analytical model is proposed to confirm the stress evolution and to explain the influence of the formation stiffness on the stress drop. The impact of hydration on cement stress is significant and must be taken into account in well integrity and leakage assessment studies.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862458","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