Cement & concrete composites最新文献_第10页

Influence of seawater on the microstructure of calcium-silicate-hydrate (C-S-H) gels with varying Ca/Si ratios based on alite-silicon dioxide system 海水对钙硅水合物（C-S-H）凝胶微观结构的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-23 DOI: 10.1016/j.cemconcomp.2025.106251

Yangyang Zhang , Shengwei Cao , Jun Chang , Siqi Ding , Qingxin Zhao , Chi Sun Poon

{"title":"Influence of seawater on the microstructure of calcium-silicate-hydrate (C-S-H) gels with varying Ca/Si ratios based on alite-silicon dioxide system","authors":"Yangyang Zhang , Shengwei Cao , Jun Chang , Siqi Ding , Qingxin Zhao , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106251","DOIUrl":"10.1016/j.cemconcomp.2025.106251","url":null,"abstract":"<div><div>Seawater sea-sand concrete has emerged as a promising sustainable construction material, leveraging abundant marine resources to mitigate freshwater dependency and address global sand scarcity while offering economic and ecological advantages. Despite its potential, the hydration mechanisms governing ordinary Portland cement (OPC) blended with supplementary cementitious materials (SCMs) in seawater remain unresolved, impeding predictions of long-term durability. This study investigated the influence of seawater on the alite (C<sub>3</sub>S, the primary clinker in OPC)-silicon dioxide (SiO<sub>2</sub>, the main composition of SCMs) hydration system, employed as a simplified model for OPC and SCMs, with a particular emphasis on hydration kinetics, hydration products, and the microstructural evolution of calcium-silicate-hydrate (C-S-H) gels with varying calcium-to-silicon (Ca/Si) ratios. Comparative analyses of specimens mixed with seawater or deionized water for 1 and 28 days revealed that seawater significantly accelerated the hydration rate of C<sub>3</sub>S-SiO<sub>2</sub> system, an effect amplified by the incorporation of silica and sustained throughout hydration. Hydration in seawater led to the formation of unique products, including sodium chloride and gypsum, with increased silica content enhancing their amounts. Furthermore, seawater exposure altered the C-S-H gel microstructure, enhancing the overall amount. However, higher silica contents (lower Ca/Si ratios) promoted an increased adsorption of sodium and chloride ions, and consequently decreased the mean molecular chain length and polymerization degree of C-S-H. The high silica content also degraded the micromechanical properties, which was reflected by the shifts towards lower-density C-S-H and a greater decrease in average modulus in the seawater system compared to the deionized water system.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106251"},"PeriodicalIF":10.8,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694073","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-scale characterization of the 3D printed concrete strength considering the full grade pore structure 考虑全级孔隙结构的3D打印混凝土强度多尺度表征

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-22 DOI: 10.1016/j.cemconcomp.2025.106246

Jianzhuang Xiao , Zhenyuan Lv , Zhenhua Duan , Chuanzeng Zhang

{"title":"Multi-scale characterization of the 3D printed concrete strength considering the full grade pore structure","authors":"Jianzhuang Xiao , Zhenyuan Lv , Zhenhua Duan , Chuanzeng Zhang","doi":"10.1016/j.cemconcomp.2025.106246","DOIUrl":"10.1016/j.cemconcomp.2025.106246","url":null,"abstract":"<div><div>The macro-mechanical characteristics of 3D printed concrete (3DPC) are impacted by the porous interfaces from both filaments and interlayers. Under the consideration of a full pore size characterization, the variations on pore size-volume are investigated in the spatial distribution of the micro-, meso-, and macro-scales. The introduced pores affect the distribution density and geometric characteristics of hydrated pores. An active regulation of introduced and hydrated pores after hardening is achieved by microbial healing method, which affects the spatial distribution of the gel pores, capillaries and printed voids. The results indicate that the anisotropic compressive strength of concrete is correlated with distribution and number of pores in a size range between 20 nm and 3mm. A pore-strength model for 3DPC is developed and analyzed based on <em>Powers</em> theory, to simulate the effects of spatial distribution in stacked interfaces. In addition, the 3DPC constitutive stress-strain relationship with three mixing ratios considering the pore shapes and spatial distributions are established and evaluated.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106246"},"PeriodicalIF":10.8,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144684619","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

Numerical and experimental assessment of thermally exposed textile-reinforced alkali-activated concrete with altered impregnated interphases 浸渍界面相改变的热暴露纺织增强碱活化混凝土的数值与实验评价

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-07-22 DOI: 10.1016/j.cemconcomp.2025.106231

Jitong Zhao , Martin Sobczyk , Marco Liebscher , Ameer Hamza Ahmed , Thomas Wallmersperger , Viktor Mechtcherine

{"title":"Numerical and experimental assessment of thermally exposed textile-reinforced alkali-activated concrete with altered impregnated interphases","authors":"Jitong Zhao , Martin Sobczyk , Marco Liebscher , Ameer Hamza Ahmed , Thomas Wallmersperger , Viktor Mechtcherine","doi":"10.1016/j.cemconcomp.2025.106231","DOIUrl":"10.1016/j.cemconcomp.2025.106231","url":null,"abstract":"<div><div>Limited thermal resistance and poor chemical compatibility between polymer-bound multi-filament reinforcements and cementitious matrices present significant challenges during upgrading, retrofitting, and constructing structures. For this purpose, the study at hand assesses the use of mineral-impregnated carbon fibers (MCFs) as an innovative reinforcement technology. Direct tensile tests combined with finite element modeling based on the concrete damage plasticity (CDP) constitutive law were employed to unveil the thermomechanical behavior and cracking evolution of textile reinforced alkali-activated concrete composites with altered impregnation matrices and thermal exposure ranging up to 200°C. To evaluate load bearing capacity against elevated temperatures, results were compared to both a control set (room temperature, 20°C) and epoxy-impregnated commercial roving. Tensile stress–strain curves exhibited a bi-linear response, characterized by an initial elastic phase, followed by a pseudo-linear stage dominated by matrix cracking and textile load-bearing, consistent with the numerical results. Image analysis using the digital image correlation method and micro-computed tomography (<span><math><mi>μ</mi></math></span>CT) demonstrated better crack control and failure behavior at the micro-scale for MCF composites. The application of geopolymer (GP) impregnation indeed achieved enhanced temperature resistance and improved chemical compatibility, promoting the formation of finely distributed crack patterns with reduced crack widths.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106231"},"PeriodicalIF":13.1,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685088","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

Valorising bio-waste mussel shells in LC3 Systems: Hydration and mechanical performance 生物废物贻贝在LC3系统中的增值：水化和机械性能

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-07-20 DOI: 10.1016/j.cemconcomp.2025.106245

Leqing Lin , Mingjun Xie , Xu Li , Yu Jin , Yaocheng Wang , Zhengwu Jiang , Feng Xing , Yun Bai

{"title":"Valorising bio-waste mussel shells in LC3 Systems: Hydration and mechanical performance","authors":"Leqing Lin , Mingjun Xie , Xu Li , Yu Jin , Yaocheng Wang , Zhengwu Jiang , Feng Xing , Yun Bai","doi":"10.1016/j.cemconcomp.2025.106245","DOIUrl":"10.1016/j.cemconcomp.2025.106245","url":null,"abstract":"<div><div>Limestone calcined clay cement (LC<sup>3</sup>) is a promising low-carbon binder; however, intrinsic drawbacks, including the relatively low reactivity of calcite and decreased early strength, limit its ability to compensate for cement clinker reduction. In this study, mussel shell powder (MSP), derived from a widely available bio-waste, was investigated as a sustainable replacement for limestone in LC<sup>3</sup> systems, offering a more reactive polymorph of aragonite. The results showed that, compared to LC<sup>3</sup>, MSP-based LC<sup>3</sup> (m-LC<sup>3</sup>) exhibited a longer induction period due to the retardation effect of the organic matrix present in the MSP. However, it gradually released the more reactive aragonite phase in the alkaline environment, which facilitated the formation of greater amounts of hemicarboaluminate and monocarboaluminate at early hydration stages. This enhanced early strength by 130 % and 58 % at 1 day for m-LC<sup>3</sup> without and with sulphate adjustment, respectively. At later stages, the portlandite concentration decreased due to the pozzolanic reaction with metakaolin, and the release of aragonite slowed down. As a result, m-LC<sup>3</sup> showed slightly higher strength at 28 days. As a low-CO<sub>2</sub> binder, m-LC<sup>3</sup> not only leverages a waste-derived source of metastable CaCO<sub>3</sub> but also demonstrates potential for large-scale performance improvements and carbon footprint reduction.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106245"},"PeriodicalIF":13.1,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664580","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

An innovative strategy of exploring high-strength engineered cementitious composites to solve the strength-ductility dilemma of UHPC structures 探索高强工程胶凝复合材料解决超高性能混凝土结构强度-延性困境的创新策略

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-20 DOI: 10.1016/j.cemconcomp.2025.106247

Zhi Zhang , Yao Ding , Ling-zhi Li , Nauman Ahmad , Ajad Shrestha , Victor Li , Kequan Yu

{"title":"An innovative strategy of exploring high-strength engineered cementitious composites to solve the strength-ductility dilemma of UHPC structures","authors":"Zhi Zhang , Yao Ding , Ling-zhi Li , Nauman Ahmad , Ajad Shrestha , Victor Li , Kequan Yu","doi":"10.1016/j.cemconcomp.2025.106247","DOIUrl":"10.1016/j.cemconcomp.2025.106247","url":null,"abstract":"<div><div>Ultra-high-performance concrete (UHPC) featuring high compressive and tensile strength could significantly enhance the load capacity of UHPC structures. However, due to the apparently inferior strain capacity of UHPC compared to that of steel bar, the deformation capacity of UHPC structures is substantially lower even than that of conventional reinforced concrete structures, leading to a strength-ductility dilemma for these kinds of structures. High-strength engineered cementitious composite (HS-ECC), combining the excellent tensile behavior of ECC (especially the tensile strain capacity) and the compressive performance of UHPC, could work compatibly with steel bars for the whole loading process preventing crack localization. This enhances both load and deformation capacity of HS-ECC structure. HS-ECC beams exhibited superior ductility and load capacity than those of UHPC beams with reinforcement ratio within 3.6 % in this research. When the reinforcement ratio was 1.3 %, the ductility index of HS-ECC exceeded that of UHPC 402.5 %. A theoretical model based on the layered section method was further proposed, accurately predicting the load-midspan deflection curves of HS-ECC beams. Analysis revealed that the contribution of HS-ECC to flexural strength of HS-ECC beams decreased significantly with increasing reinforcement ratio. The requirement of HS-ECC tensile strain capacity decreased, while the requirement of HS-ECC compressive strain capacity increased with increasing reinforcement ratio. Finally, a performance-based design method considering the compressive-zone depth as the indicator was proposed, which can balance the strength and ductility of HS-ECC beams, as well as increase the utilization ratio of HS-ECC. This research lay the ground for the design and practical application of reinforced HS-ECC beam.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106247"},"PeriodicalIF":10.8,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664579","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

Biochar-amended high-strength engineered cementitious composites 生物炭改性高强度工程胶凝复合材料

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-07-16 DOI: 10.1016/j.cemconcomp.2025.106219

Amir Ali Shahmansouri , Zhigang Zhang , Hessam AzariJafari , Xianming Shi

{"title":"Biochar-amended high-strength engineered cementitious composites","authors":"Amir Ali Shahmansouri , Zhigang Zhang , Hessam AzariJafari , Xianming Shi","doi":"10.1016/j.cemconcomp.2025.106219","DOIUrl":"10.1016/j.cemconcomp.2025.106219","url":null,"abstract":"<div><div>This study evaluates biochar as a sustainable cement replacement in high-strength engineered cementitious composites (ECC), focusing on mechanical performance, durability, microstructural characteristics, and environmental impacts. A biochar product was incorporated at 5 %, 10 %, 20 %, and 30 % replacement levels by weight of cement, and its effects were assessed through compressive strength test, tensile performance analysis, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and life cycle assessment (LCA). The biochar enhanced internal curing of the ECC, which led to 28-day compressive strengths ranging from 95.4 MPa to 99.6 MPa. The tensile strength of ECC was improved by the biochar addition, reaching 8.58 MPa at 20 wt% biochar content, though the strain capacity decreased at higher biochar levels. TGA revealed a reduction in the portlandite amount, suggesting enhanced pozzolanic activity of the binder, and SEM images confirmed a denser interfacial transition zone (ITZ) at 5–10 % biochar, improving the fiber-matrix bonding. Although higher biochar dosages increased the water sorptivity and gas permeability of ECC, they reduced the total shrinkage by up to 24%. The LCA indicated a carbon emission reduction of up to 80 %, sequestering 2.0 kg of CO<sub>2</sub>-eq per kg of biochar. However, the source of biochar can influence the amount of emissions. These findings underscore the potential of biochar-ECC as a viable solution for sustainable construction, combining high mechanical performance with reduced environmental impacts.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106219"},"PeriodicalIF":13.1,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144640637","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

Photocatalytic cementitious composites: enhanced air purification performance by BOF slag addition 光催化胶凝复合材料：添加转炉炉渣增强空气净化性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-16 DOI: 10.1016/j.cemconcomp.2025.106244

Daoru Liu , J.C.O. Zepper , Koh Chuen Hon , Yuxuan Chen , Qingliang Yu

{"title":"Photocatalytic cementitious composites: enhanced air purification performance by BOF slag addition","authors":"Daoru Liu , J.C.O. Zepper , Koh Chuen Hon , Yuxuan Chen , Qingliang Yu","doi":"10.1016/j.cemconcomp.2025.106244","DOIUrl":"10.1016/j.cemconcomp.2025.106244","url":null,"abstract":"<div><div>This paper investigates the utilization of BOF slag as a cementitious support for photocatalytic nitrogen oxides abatement, presenting an exploratory study on its potential to address environmental concerns. The phase composition of BOF slag-based mortars is studied using XRD, FTIR, and TGA, while binding energy and microstructure are investigated with XPS and MIP, respectively. The photocatalytic NO<sub>x</sub> degradation properties of as-prepared mortars are characterized. The BOF slag-based mortar without TiO<sub>2</sub> addition exhibits a %Conversion of about 10 % and a %Selectivity of 97 %. Furthermore, the BOF slag-based mortar demonstrates better photocatalytic properties than the OPC-based mortar when the same amount (5 wt%) of TiO<sub>2</sub> photocatalyst is used. The addition of quartz insignificantly affects the %Conversion but significantly lowers the %Selectivity. These findings underscore the potential of BOF slag as a promising alternative support material for photocatalytic NO<sub>x</sub> abatement, offering insights into its application in sustainable environmental remediation strategies. The limitations of this study are revealed, and future research directions are proposed.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106244"},"PeriodicalIF":10.8,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144640666","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 SCM and superplasticizer on excessive paste thickness and properties of concrete SCM和高效减水剂对混凝土过厚及性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-15 DOI: 10.1016/j.cemconcomp.2025.106233

Zhen Jiang , Yizhong Mao , Dengwu Jiao , Xiang Hu , Muhammad Talha Ghafoor , Caijun Shi

{"title":"Effect of SCM and superplasticizer on excessive paste thickness and properties of concrete","authors":"Zhen Jiang , Yizhong Mao , Dengwu Jiao , Xiang Hu , Muhammad Talha Ghafoor , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106233","DOIUrl":"10.1016/j.cemconcomp.2025.106233","url":null,"abstract":"<div><div>The optimum mix design considering fresh and hardened mechanical properties is of great significance for the quality of construction materials. This study mainly examines the influence of excessive paste thickness based on the variation of supplementary cementitious materials (SCMs) and superplasticizer content on the mechanical properties of high-performance concrete (HPC). The test results exhibited the significance of excessive paste thickness on slump flowability and flow retention even without a superplasticizer. The yield stress of HPC was mainly influenced by the presence of a superplasticizer, however, plastic viscosity was primarily dependent on the excessive paste thickness. The test results exhibited that the presence of fly ash slightly improves the rheological properties of HPC, however, its trend depends on the presence of a superplasticizer. The excessive paste thickness has a positive impact on the strength development of HPC up to an optimal point indicating the significance of paste thickness as well as superplasticizer. A slight reduction in compressive strength was observed with the replacement of cement with fly ash, however, a positive impact based on the presence of slag was observed. No significant effect of excessive paste thickness on various environmental factors such as abrasion, chloride penetration, and carbonation of HPC was examined.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106233"},"PeriodicalIF":10.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144630033","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

Synergistic effects of preheated polyethylene terephthalate yarns and nano-carbon black particles on the mortar high-temperature performance 预热聚对苯二甲酸乙酯纱线与纳米炭黑颗粒对砂浆高温性能的协同作用

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-07-15 DOI: 10.1016/j.cemconcomp.2025.106243

Zi Jian Wang , Zheng Hui Phua , Wei Ping Chan , Grzegorz Lisak

{"title":"Synergistic effects of preheated polyethylene terephthalate yarns and nano-carbon black particles on the mortar high-temperature performance","authors":"Zi Jian Wang , Zheng Hui Phua , Wei Ping Chan , Grzegorz Lisak","doi":"10.1016/j.cemconcomp.2025.106243","DOIUrl":"10.1016/j.cemconcomp.2025.106243","url":null,"abstract":"<div><div>The effects of nano-carbon black (NCB) and two types of polyethylene terephthalate (PET) yarns, the general yarn (YPET) and the modified material with heat treatment (H-YPET), are investigated in regard to the initial and residual mechanical properties of mortar at various temperatures. The combination of YPETs and NCB in mortar mitigates the agglomeration effect of NCB and the weak compressive performance of YPET fibre-reinforced mortars (FRM). Meanwhile, preheating alters the surface properties of H-YPETs, improving the strength and thermal stability of mortars. YPET FRMs with NCB present superior mechanical properties at ambient temperature, improving flexural strength (FS) by 44.8 % (7 days) and 43.2 % (28 days), respectively, while demonstrating comparable compressive strength (CS) to the control before and after high temperature exposures. H-YPET FRM (without NCB) present superior thermal durability, enhancing FS by 19.5 % at 28 days, residual flexural strength after 250 °C heating by 2.7 %, residual compressive strength after 250 °C and 400 °C by 8.9 % and 15.8 %, respectively, while demonstrating comparable CS to the control at ambient temperatures. This study provides two novel and promising mortar materials with outstanding mechanical properties and thermal stabilities, contributing interesting and useful insights towards sustainable building materials with the potentials to possess different functionalities.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106243"},"PeriodicalIF":10.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144630163","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

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