Cement & concrete composites最新文献_第3页

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

IF 10.8 1区工程技术

Cement & 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":"10.1016/j.cemconcomp.2025.106102","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"162 ","pages":"Article 106102"},"PeriodicalIF":10.8,"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":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

Production of a low-carbon and economical high-strength artificial aggregate from gold tailings for the preparation of lightweight aggregate concrete 用金尾矿制备低碳经济高强度人工骨料制备轻骨料混凝土

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-22 DOI: 10.1016/j.cemconcomp.2025.106100

Xiangkun Zhang , Chao Zhang , Zhijuan Hu , Zesheng Wang , Zhiwei Cao , Wenlong Wang

{"title":"Production of a low-carbon and economical high-strength artificial aggregate from gold tailings for the preparation of lightweight aggregate concrete","authors":"Xiangkun Zhang , Chao Zhang , Zhijuan Hu , Zesheng Wang , Zhiwei Cao , Wenlong Wang","doi":"10.1016/j.cemconcomp.2025.106100","DOIUrl":"10.1016/j.cemconcomp.2025.106100","url":null,"abstract":"<div><div>This study prepared a low-carbon and economical high-strength artificial aggregates (HSAs) using sulfur-aluminum-ferric cementitious materials (SAF), fluorine gypsum (FG), and gold tailings (GT). Furthermore, HSAs were used to prepare concrete by replacing gravel and sand. The results show that at 80% GT, 17% SAF, and 3% FG, HSA has a high cylinder compressive strength of up to 12.57 MPa, a loose bulk density of less than 1200 kg/m<sup>3</sup>, a 1h water absorption of 8.35% and a specific strength of 10.48 MPa cm<sup>3</sup>/g, which are much better than the standard requirements for high-strength artificial aggregates. The main hydration products of HSAs were AFt, AH<sub>3</sub>, and C-S-H, where AFt is the skeleton, the AH<sub>3</sub>, and C-S-H are the gels, and the un-hydrated particles are the filler, which jointly build up the dense structure of the HSAs. Furthermore, the heavy metal leaching, chloride ion content, and radioactivity of the HSAs meet the standard requirements, which can be considered harmless to the environment. HSAs are prepared from all-solid waste and can consume more than 80% of GT. The CO<sub>2</sub> emission and cost of HSAs were 0.056–0.08 kgCO<sub>2</sub>/kg and 39.97–57.1 Yuan/t. Finally, a lightweight aggregate concrete (LWAC) with superior workability, dense structure, and strength class of LC50 was prepared using HSAs.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106100"},"PeriodicalIF":10.8,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143862462","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

3D micro-CT driven fibre orientation–confinement correlation model for ultra-high-performance concrete (UHPC) 超高性能混凝土（UHPC）三维微ct驱动纤维取向-约束相关模型

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-22 DOI: 10.1016/j.cemconcomp.2025.106081

Shack Yee Hiew , Keat Bin Teoh , Sudharshan N. Raman , Chung-Chan Hung , Doo-Yeol Yoo , Kuo-Wei Wen , Daniel Kong , Yen Lei Voo

{"title":"3D micro-CT driven fibre orientation–confinement correlation model for ultra-high-performance concrete (UHPC)","authors":"Shack Yee Hiew , Keat Bin Teoh , Sudharshan N. Raman , Chung-Chan Hung , Doo-Yeol Yoo , Kuo-Wei Wen , Daniel Kong , Yen Lei Voo","doi":"10.1016/j.cemconcomp.2025.106081","DOIUrl":"10.1016/j.cemconcomp.2025.106081","url":null,"abstract":"<div><div>Accurately characterising steel fibres is paramount for developing a representative confinement model for Ultra-High-Performance Concrete (UHPC). Existing models oversimplify the fibre contributions by assuming a singular orientation, which fails to reflect the material variation resulting from actual fibre distribution. In this study, the authors refined the fibre orientation characteristics to establish a correlation with the confined core capacity at the structural level. To achieve this, multi-scale investigations, from experimental testing to X-ray micro-computed tomography (micro-CT) imaging on steel-confined UHPC specimens, were conducted, by varying internal (fibre types and contents) and external confinement pressures. A novel framework was developed to calibrate effective fibre orientation under varying fibre contents. This led to the introduction, for the first time, of a reliable fibre orientation model for UHPC subjected to varying confinement levels. The proposed model provided accurate predictions of the confined core capacity, aligning well with both scanned and unscanned specimens.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106081"},"PeriodicalIF":10.8,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857275","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

Time dependence of corrosion resistance in belitic calcium sulfoaluminate (BCSA) cement concrete 贝氏岩型硫铝酸钙（BCSA）水泥混凝土耐蚀性的时间依赖性

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-20 DOI: 10.1016/j.cemconcomp.2025.106099

Tayyab Adnan , Éric P. Bescher , Robert J. Thomas

引用次数: 0

Effect of TiO2/montmorillonite on the photocatalytic and mechanical properties of cementitious materials TiO2/蒙脱土对胶凝材料光催化性能和力学性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-20 DOI: 10.1016/j.cemconcomp.2025.106098

Junjie Zhang , Yuzhe Li , Hongbo Tan

{"title":"Effect of TiO2/montmorillonite on the photocatalytic and mechanical properties of cementitious materials","authors":"Junjie Zhang , Yuzhe Li , Hongbo Tan","doi":"10.1016/j.cemconcomp.2025.106098","DOIUrl":"10.1016/j.cemconcomp.2025.106098","url":null,"abstract":"<div><div>The poor dispersion of nano-TiO<sub>2</sub> adversely affects the photocatalytic performance of photocatalytic cementitious materials (PCMs). In this study, a supported composite photocatalyst TiO<sub>2</sub>/montmorillonite (TiO<sub>2</sub>/Mt) was employed to prepare PCMs, aiming to improve the dispersion behavior of nano-TiO<sub>2</sub>. The impact of TiO<sub>2</sub>/Mt on the photocatalytic and mechanical properties of cementitious materials was also evaluated. The dispersion state of nano-TiO<sub>2</sub> was assessed through changes in particle size and zeta potential. The hydration process of PCMs was analyzed using hydration heat, X-ray diffractometer (XRD), and <sup>29</sup>Si-nuclear magnetic resonance (<sup>29</sup>Si-NMR), while the microstructure was examined by scanning electron microscope (SEM) and mercury intrusion porosimeter (MIP). Results indicated that, compared to TiO<sub>2</sub>-PCMs (P25-PCMs), the methylene blue (MB)/NO removal capacity of TiO<sub>2</sub>/Mt-PCMs was promoted, attributed to the improved dispersion state of nano-TiO<sub>2</sub> in cementitious materials. It was observed that TiO<sub>2</sub>/Mt exhibited significant agglomeration in the cementitious liquid phase due to the strong electrostatic attraction of calcium ions. However, the presence of PCE effectively mitigated this agglomeration through complexation and spatial site resistance effects. Additionally, the compressive strength of cementitious materials was significantly enhanced with the addition of TiO<sub>2</sub>/Mt. The nucleation effect of nanoparticles in TiO<sub>2</sub>/Mt shortened the induction period and accelerated hydrate formation. Furthermore, the excellent filling effect of TiO<sub>2</sub>/Mt reduced the porosity. This research provides valuable insights into achieving uniform dispersion of nano-TiO<sub>2</sub> in cementitious materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106098"},"PeriodicalIF":10.8,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853347","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

Characterization and analysis of the self-healing behavior of alkali-activated slag mortar 碱活化矿渣砂浆自愈性能的表征与分析

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-20 DOI: 10.1016/j.cemconcomp.2025.106097

Yanshuai Wang , Hao Ye , Rongxin Peng , Xiangping Xian , Shuxian Hong

{"title":"Characterization and analysis of the self-healing behavior of alkali-activated slag mortar","authors":"Yanshuai Wang , Hao Ye , Rongxin Peng , Xiangping Xian , Shuxian Hong","doi":"10.1016/j.cemconcomp.2025.106097","DOIUrl":"10.1016/j.cemconcomp.2025.106097","url":null,"abstract":"<div><div>Alkali-activated slag (AAS) mortar has substantial limitations owing to its autogenous shrinkage, which leads to crack formation, and the self-healing property presents a promising solution to maintain its integrity and durability. Based on this, the self-healing efficiency of AAS mortar under a stable alkaline environment was assessed, with exogenous calcium ions introduced via a Ca(OH)<sub>2</sub> solution, and the self-healing mechanism was investigated with exogenous carbonate ions introduced to promote carbonation. To evaluate the effectiveness of these methods, both the physical properties and the microstructural characteristics of the AAS mortar under different healing environments were analyzed. The results revealed that self-healing environments, including secondary alkali activation and carbonation, substantially improved the rates of compressive strength recovery to 97.96 % and permeability recovery to 32.1 %. AAS mortar samples immersed in a saturated Ca(OH)<sub>2</sub> solution with wet-dry cycles, as well as those alternatingly immersed in Ca(OH)<sub>2</sub> and Na<sub>2</sub>CO<sub>3</sub> showed higher matrix-crack bond strength recovery rates (43.7 % and 23.1 %, respectively) than samples exposed to only a saturated Ca(OH)<sub>2</sub> solution (11.4 %). The predominant healing products, including CaCO<sub>3</sub> and calcium aluminum silicate hydrate, effectively bonded to the cracks, contributing to significant recovery of the physical properties. Thus, the optimal self-healing of the AAS mortar requires an alkaline environment with abundant calcium ions to improve CaCO<sub>3</sub> precipitation. Additionally, continuous carbonation with exogenous carbonate ions further improves the healing efficiency.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106097"},"PeriodicalIF":10.8,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143853346","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

Insights on solid CO2 mixing method for hybrid alkaline cement (HAC): performance, sustainability, and experimental system improvement 混合碱性水泥（HAC）固体二氧化碳混合方法的见解：性能、可持续性和实验系统改进

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-18 DOI: 10.1016/j.cemconcomp.2025.106096

Yi-Sheng Wang , Runsheng Lin , Xiao-Yong Wang

{"title":"Insights on solid CO2 mixing method for hybrid alkaline cement (HAC): performance, sustainability, and experimental system improvement","authors":"Yi-Sheng Wang , Runsheng Lin , Xiao-Yong Wang","doi":"10.1016/j.cemconcomp.2025.106096","DOIUrl":"10.1016/j.cemconcomp.2025.106096","url":null,"abstract":"<div><div>New low-carbon concrete materials and technologies are urgently needed to reduce CO<sub>2</sub> emissions and achieve sustainable development in the cement industry. Hybrid alkaline cement (HAC) is a new cement-based material that combines the advantages of ordinary Portland cement and alkali-activated cement. This study introduces a solid CO<sub>2</sub> mixing method and investigated its impact on the performance and sustainability of HAC. Research results show that the initial internal temperature of HAC decreases after solid CO<sub>2</sub> is mixed. The temperature gradually increased and surpassed that of the control sample within 12 h. The sequestration of solid CO<sub>2</sub> triggers a carbonation reaction within the material, leading to a reduction in calcium hydroxide and an increase in calcium carbonate content. An increase in solid CO<sub>2</sub> leads to a decrease in workability. Tests lasting up to 90 days demonstrated that the method substantially enhanced the strength and resistivity of HAC. This study considers two boundary conditions due to CO<sub>2</sub> escape when quantifying the CO<sub>2</sub> emissions of HAC and clarifies the specific levels under actual dose and optimized dose scenarios. The findings demonstrate the potential of the solid CO<sub>2</sub> mixing method to optimize material performance while highlighting its dual impact on sustainability. In addition, this study proposes an experimental idea for recovering the escaped CO<sub>2</sub> and using it for carbonation curing. These findings provide valuable insights and practical foundations for advancing the concrete industry to achieve sustainable development.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106096"},"PeriodicalIF":10.8,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849968","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

Insight into the boundary flow resistance of high-workable concrete in different states: placing and pumping 高工作性混凝土不同浇筑和泵送状态下的边界流动阻力分析

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-17 DOI: 10.1016/j.cemconcomp.2025.106094

Shijun Yuan , Zhisong Xu , Tengfei Feng , Jiaping Liu

{"title":"Insight into the boundary flow resistance of high-workable concrete in different states: placing and pumping","authors":"Shijun Yuan , Zhisong Xu , Tengfei Feng , Jiaping Liu","doi":"10.1016/j.cemconcomp.2025.106094","DOIUrl":"10.1016/j.cemconcomp.2025.106094","url":null,"abstract":"<div><div>The flow resistance of modern high-workable concrete during pumping is usually considered linearly related to the flow rate, but some studies have found a non-linear relationship. An accurate assessment model of concrete flow resistance at different flow rates remains unclear. This study presents a methodology for calculating the boundary resistance of high-workable concrete based on other flow velocity ranges during the pumping and placing of the concrete. A modified interfacial rheometer was developed, and a particular test procedure was applied to test the flow resistance of 18 groups of high-workable concretes. The flow resistance changes during the increasing and decreasing stages of the flow speed were comprehensively analyzed. Both hydrodynamic interactions and particle friction characteristics have been considered. The results show a two-state linear relationship between boundary resistance and flow speed, corresponding to low flow speed (LFS, for placing) and high flow speed (HFS, for pumping). Finer sand, higher mortar volume, and a specific aggregate ratio reduce the viscous resistance constant, while a higher roundness of CA reduces the slip yield stress. Boundary resistance increases linearly with the interfacial self-friction coefficient, highlighting particle properties' critical role in flow resistance. This study reveals the origin of flow resistance and the factors affecting the interface rheological properties at different flow states and provides valuable insights for optimizing the pumping.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106094"},"PeriodicalIF":10.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143841221","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 inertia and test approach on the high-strain-rate tensile behavior of steel fiber reinforced concrete 惯性和试验方法对钢纤维混凝土高应变速率拉伸性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-16 DOI: 10.1016/j.cemconcomp.2025.106095

Mohammad Bakhshi, Isabel B. Valente, Honeyeh Ramezansefat, Joaquim A.O. Barros

{"title":"Effect of inertia and test approach on the high-strain-rate tensile behavior of steel fiber reinforced concrete","authors":"Mohammad Bakhshi, Isabel B. Valente, Honeyeh Ramezansefat, Joaquim A.O. Barros","doi":"10.1016/j.cemconcomp.2025.106095","DOIUrl":"10.1016/j.cemconcomp.2025.106095","url":null,"abstract":"<div><div>High strain rate loadings lead to fundamental modifications in the tensile stress-strain response of steel fiber-reinforced concrete (SFRC). These modifications include higher tensile strength and corresponding strain and fracture energy. This paper investigates the effect of strain rate on the tensile behavior of SFRC, covering ranges from quasi-static (10<sup>−6</sup> to 10<sup>−1</sup> s<sup>−1</sup>) to impact (10–50 s<sup>−1</sup>). For this purpose, an instrumented drop-weight test setup was developed. The instrumentation includes a high-speed response data acquisition, a high-speed video camera, two fast response load cells, one clip gauge, and two strain gauges. Axial and transversal inertia effects were considered during the impact process to reach the real tensile behavior of SFRC. The effects of strain rate on the stress–strain and stress versus cracking opening displacement relations, tensile strength, and fracture energy of SFRC are obtained and discussed in both quasi-static and impact ranges. Novel models are proposed for predicting the strain rate effect on the tensile strength and fracture energy of SFRC, considering the type of tensile load applied. The models proposed in the current study are compared with the experimental results obtained within this research and those available in other studies. The findings demonstrate that incorporating the influence of inertia and employing the proposed models for the testing approach markedly enhances the accuracy in predicting the dynamic tensile behavior of SFRC.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"161 ","pages":"Article 106095"},"PeriodicalIF":10.8,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143837121","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 mix design factors on the self-stress-sensing behavior of metakaolin-based geopolymer 配合比设计因素对偏高岭土聚合物自应力感知行为的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-04-15 DOI: 10.1016/j.cemconcomp.2025.106093

Krishnan U. Ambikakumari Sanalkumar, En-Hua Yang

引用次数: 0