Cement & concrete composites最新文献_第8页

The impact of fly ash on self-healing of slag-based engineered geopolymer composites 粉煤灰对渣基工程地聚合物复合材料自愈的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-12 DOI: 10.1016/j.cemconcomp.2025.106447

Yiming Zhou , Mohamed Elchalakani , Pouria Ayough , Ali Sadakkathulla

{"title":"The impact of fly ash on self-healing of slag-based engineered geopolymer composites","authors":"Yiming Zhou , Mohamed Elchalakani , Pouria Ayough , Ali Sadakkathulla","doi":"10.1016/j.cemconcomp.2025.106447","DOIUrl":"10.1016/j.cemconcomp.2025.106447","url":null,"abstract":"<div><div>This study explores the influence of varying fly ash dosages on the self-healing behaviour of slag-based engineered geopolymer composites (EGCs). The findings reveal that altering the fly ash content significantly impacts the self-healing performance of EGCs. Under dry-wet cycle conditions, EGCs with lower fly ash dosages exhibit enhanced self-healing, while in a sustained 10 % NaCl solution environment, higher fly ash dosages result in superior self-healing. This divergence in performance is attributed to the different healing products formed in each environment. Specifically, a mix design (Mix4 in this research) showed apparent 150 % recovery without completely visible crack healing, which is considered as extended strain capacity rather than healing of properties at the same strain range. This phenomenon is explained by the different mechanisms governing mechanical property recovery and crack healing. Mechanical recovery is primarily driven by the formation of healing products in the interface between the fibre and matrix, whereas crack healing relies on the extensive generation and accumulation of products within the cracks. These two mechanisms have varying demands for the quantity of healing products, with mechanical property recovery requiring significantly less than crack healing.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106447"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145728837","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 property analysis and carbonation process modeling of GGBFS-based foam alkali-activated binder 基于ggfs的泡沫碱活化粘结剂碳化性能分析及碳化过程建模

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-12 DOI: 10.1016/j.cemconcomp.2025.106446

Jialong Lin , Suxi Wang , Heyuan Yu , Shenhao Ye , Jiaxi Mao , Shikun Chen , Yi Liu , Dongming Yan

{"title":"Carbonation property analysis and carbonation process modeling of GGBFS-based foam alkali-activated binder","authors":"Jialong Lin , Suxi Wang , Heyuan Yu , Shenhao Ye , Jiaxi Mao , Shikun Chen , Yi Liu , Dongming Yan","doi":"10.1016/j.cemconcomp.2025.106446","DOIUrl":"10.1016/j.cemconcomp.2025.106446","url":null,"abstract":"<div><div>In this study, the carbonation behavior of ground granulated blast furnace slag (GGBFS)-based foam alkali-activated binder was investigated under varied CO<sub>2</sub> curing conditions. An innovative in-situ observation approach was employed to continuously monitor the carbonation process in real time, allowing the progression of the carbonation front and stage evolution to be identified. Based on the results of multi-scale integrated analyses, a coupled diffusion–reaction kinetics model was established to quantitatively describe the spatiotemporal evolution of CO<sub>2</sub> transport and carbonate formation. This study proposes, for the first time, a three-stage diffusion process and a two-stage carbonation reaction mechanism, providing new insights into the multi-stage nature of carbonation in GGBFS-based foam alkali-activated binder. These findings refine the theoretical understanding of carbonation mechanisms in porous alkali-activated materials by elucidating the distinct diffusion and reaction stages.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106446"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145728838","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

Three-stage synergistic hydration in CFBFA–GGBFS–steel slag–desulfurization gypsum binders: a coupled calorimetry–ion release quantification cfbfa - ggbfs -钢渣-脱硫石膏粘结剂的三级协同水化：耦合量热-离子释放定量

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2026-01-02 DOI: 10.1016/j.cemconcomp.2026.106461

Xinyi Liu , Wenhuan Liu , Lu Zhang , Yongfeng Wan , Hui Li , Meili Bai

{"title":"Three-stage synergistic hydration in CFBFA–GGBFS–steel slag–desulfurization gypsum binders: a coupled calorimetry–ion release quantification","authors":"Xinyi Liu , Wenhuan Liu , Lu Zhang , Yongfeng Wan , Hui Li , Meili Bai","doi":"10.1016/j.cemconcomp.2026.106461","DOIUrl":"10.1016/j.cemconcomp.2026.106461","url":null,"abstract":"<div><div>Sustainable low-carbon cementitious materials offer a dual solution to global warming and resource depletion by enabling large scale use of industrial solid waste and reducing the high carbon footprint of cement production. However, quantitative understanding of the dynamic hydration processes in multi-source solid waste binders remains limited. To address this gap, this study combined the coupled calorimetry-ion release analysis to quantitatively investigate the hydration of CFBFA-based binders. This approach led to the establishment of a novel three-stage synergistic hydration model (“rapid dissolution–dynamic equilibrium–sustained-release diffusion”). The research findings are as follows: (1) CFBFA inhibits Ca(OH)<sub>2</sub> formation and gypsum consumption; (2) The porous structure and particle packing of CFBFA govern the long-term release of active Si and Al, thereby controlling the kinetics of later-stage hydration and ultimately determining the development of long-term strength; (3) The synergy of DG and SS provides the chemical environment for dissolution, while the synergistic hydration of SS-GGBFS and the sustained-release mechanism of CFBFA contribute to the early and later strength, respectively. The optimal mix (45 % CFBFA+27 % GGBFS+20 % SS+8 % DG) achieved the compressive strength of 56.2 MPa at 28 d. This study conducted a quantitative analysis of the hydration process in multi-source solid waste systems by combining calorimetric and ion release analytical methods, providing a new perspective for the design and mechanistic exploration of low-carbon cementitious materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106461"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894552","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

Simultaneous alkalinity neutralization and reactivity enhancement of red mud through CO2 mineralization 二氧化碳矿化同时中和赤泥的碱性和增强反应性

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.cemconcomp.2025.106420

Chao Zhang , Xiangkun Zhang , Zhijuan Hu , Wenlong Wang , Yingliang Zhao , Peiliang Shen

{"title":"Simultaneous alkalinity neutralization and reactivity enhancement of red mud through CO2 mineralization","authors":"Chao Zhang , Xiangkun Zhang , Zhijuan Hu , Wenlong Wang , Yingliang Zhao , Peiliang Shen","doi":"10.1016/j.cemconcomp.2025.106420","DOIUrl":"10.1016/j.cemconcomp.2025.106420","url":null,"abstract":"<div><div>The high alkalinity and low hydraulic reactivity of red mud (RM) severely restrict its application in cement or concrete industry. In this study, an innovative CO<sub>2</sub> mineralization approach for simultaneous alkalinity neutralization and reactivity enhancement of RM was developed, aiming to promote its use as a supplementary cementitious material (SCM). The results demonstrate that CO<sub>2</sub> mineralization significantly mitigates the alkalinity of RM, reducing the pH from 12.65 to 7.59. The carbonated RM exhibited remarkable pozzolanic activity, with a strength activity index of 113 % (7-day) and 109.8 % (28-day), confirming its potential as a highly active SCM. The carbonation of RM demonstrated exceptional CO<sub>2</sub> sequestration capacity, capturing 24.34 g of CO<sub>2</sub> per 100 g of RM, achieving a carbonation degree of 62.89 %. Alkalinity neutralization primarily occurs through carbonation reactions between CO<sub>2</sub> and alkaline components, generating stable carbonate precipitates. Furthermore, carbonation kinetics analysis revealed a 60.5 % reduction in average particle size and a 235.1 % increase in specific surface area of RM, indicating significant microstructural refinement. Rapid carbonation of C<sub>3</sub>S, C<sub>2</sub>S, sodalite, perovskite and jennite to the formation of calcite, metastable CaCO<sub>3</sub> and silica-alumina gel, indicating mineral reconfiguration of RM. The combined effects of microstructure refinement and mineral reconfiguration jointly enhanced the pozzolanic activity of RM. Overall, these findings establish RM carbonation as a dual-purpose solution for sustainable waste valorization and carbon capture, offering both technical and environmental advantages for industrial implementation.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106420"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145689065","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

Rheological control of cementitious composites incorporating ceramic wastes for 3D printing applications 3D打印应用中含陶瓷废料胶凝复合材料的流变控制

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-19 DOI: 10.1016/j.cemconcomp.2025.106452

Lucia Ferrari , Giacomo Rizzieri , Liberato Ferrara , Elisa Franzoni

{"title":"Rheological control of cementitious composites incorporating ceramic wastes for 3D printing applications","authors":"Lucia Ferrari , Giacomo Rizzieri , Liberato Ferrara , Elisa Franzoni","doi":"10.1016/j.cemconcomp.2025.106452","DOIUrl":"10.1016/j.cemconcomp.2025.106452","url":null,"abstract":"<div><div>In response to the environmental impact of cement production and industrial discarded materials, this study explores the valorisation of ceramic wastes as replacement of clinker in low-carbon cementitious composites for application in additive manufacturing. Ceramic wastes from different sources were used as substitute of calcined clay in limestone calcined clay cement (LC3) mortar. The embodied CO<sub>2</sub> reduction of these new binders exceeds 40 % compared to Portland Cement (PC), thus representing a notable advancement in low-emission cementitious composites. The influence of six ceramic wastes on the fresh state performance of mortar was assessed through flow table tests and rheological measurements. A ball measuring system was used to assess viscosity, static yield stress, and their early-age evolution, combining the high resolution of benchtop rheometers with the possibility of testing of 3D-printable mortars with aggregates up to 2 mm, featuring high yield stress values. Numerical simulations based on the Particle Finite Element Method were then used to evaluate the printability of developed mix designs, avoiding time consuming trial and error testing campaigns and paving the way for through printing trials on a selected set of waste materials.</div><div>Numerical simulations highlighted that, while all tested formulations showed good performance for small-scale 3D printing, careful material selection becomes crucial when targeting larger structures to ensure stability and minimize deformation. Additionally, the simulations allowed prediction of material behaviour, particularly valuable given the high variability of waste-based constituents, emphasizing the innovative combination of circular economy concepts with a unique approach to additive manufacturing supported by numerical simulations.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106452"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145785102","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 mechanisms of magnesium slag on the reaction behavior of alkali-activated blast furnace slag 镁渣对碱活化高炉渣反应行为的协同作用机理

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-15 DOI: 10.1016/j.cemconcomp.2025.106434

Shiyu Zhuang , MiaoMiao Zhu , Ruoxin Zhai , Mingming Zhu , Yutao Guo , Zihan Zhou , Jianwei Sun , Xi Jiang , Qiang Wang

{"title":"Synergistic mechanisms of magnesium slag on the reaction behavior of alkali-activated blast furnace slag","authors":"Shiyu Zhuang , MiaoMiao Zhu , Ruoxin Zhai , Mingming Zhu , Yutao Guo , Zihan Zhou , Jianwei Sun , Xi Jiang , Qiang Wang","doi":"10.1016/j.cemconcomp.2025.106434","DOIUrl":"10.1016/j.cemconcomp.2025.106434","url":null,"abstract":"<div><div>This study elucidates the synergistic mechanisms between magnesium slag (MS) and blast furnace slag (GGBS) in alkali-activated systems. Through an integrated analysis of reaction kinetics, phase assemblage, microstructure evolution and gel physicochemical characteristics, this work establishes the governing mechanism-microstructure-performance relationships for the systems. Results show that the reaction is governed by a composition-dependent, dual-stage interplay of competitive and synergistic pathways. The role of MS transitions from an initial diluent, which retards and diminishes the main GGBS exothermic peak, to an active synergistic partner. In the subsequent synergistic stage, the initial GGBS reaction provides the ion conditions and nucleation sites that trigger the hydration of MS, generating products that in turn accelerate the ongoing GGBS reaction. The addition of MS induces an Al-deficient condition, and triggers a competition where available Al preferentially partitions into the C-N-A-S-H gel, thereby inhibiting LDH formation. This in turn diverts the abundant Mg towards forming Al-independent phases such as M-S-H, brucite and magnesite. At moderate MS levels, a synergistic interplay promotes the co-precipitation of multiple gel and crystalline products, yielding a densified composite matrix. Conversely, excess MS renders the system GGBS-limited, resulting in a weak and porous matrix. Furthermore, MS promotes a dimensionally stable microstructure by diluting the overall shrinkage potential of the binder system, providing an internal restraining skeleton, and offering partial chemical compensation through expansion. The 50 % MS content is identified as optimal because it achieves the lowest strength-normalized cost and carbon footprint without compromising the effective immobilization of heavy metals.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106434"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798545","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

How about improving the lime-hemp concrete properties using bio-based polymer additives? 如何使用生物基聚合物添加剂来改善石灰-大麻混凝土的性能？

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-02 DOI: 10.1016/j.cemconcomp.2025.106422

Haichuan Liu, Kamilia Abahri, Rachid Bennacer

{"title":"How about improving the lime-hemp concrete properties using bio-based polymer additives?","authors":"Haichuan Liu, Kamilia Abahri, Rachid Bennacer","doi":"10.1016/j.cemconcomp.2025.106422","DOIUrl":"10.1016/j.cemconcomp.2025.106422","url":null,"abstract":"<div><div>The construction sector's high energy use and CO<sub>2</sub> emissions drive the search for sustainable materials such as bio-aggregate concrete. Hemp concrete, composed of hemp shiv and lime, offers benefits including a negative carbon footprint, thermal and acoustic insulation, and moisture regulation but suffers from low strength and durability. Literature studies have shown that bio-based polymers can improve the properties of lime-based materials. This study aims to evaluate the potential of using biopolymers to improve the comprehensive properties of lime-based hemp concrete. Investigated the effect of three bio-based polymers (casein, κ-carrageenan, and hydroxypropyl methylcellulose (HPMC)) on the hygrothermal properties (thermal conductivity, WVP, and MBV), mechanical strength, and capillary water absorption. Additionally, mineralogical and microstructural analyses were conducted using XRD, TG, and SEM. Results showed that within 0.5–5 % of contents, three bio-based polymers had little effect on the hygrothermal performance of hemp concrete but significantly affected mechanical strength and capillary water absorption. Adding casein hindered binder hydration and carbonation, reducing compressive strength and increasing water absorption, despite improving hygrothermal properties. Incorporating 0.5 % κ-carrageenan slightly increased compressive strength, but higher contents resulted in strength loss and higher capillary water absorption. Adding HPMC offered the most balanced performance, with 5 % content increasing strength by 155 %, reducing water absorption by 29 %, while preserving thermal conductivity and moisture buffering close to the reference group. These effects were attributed to enhanced interface bonding and the matrix itself due to HPMC's physicochemical effect. The findings contribute to developing enhanced bio-aggregate-based concrete, advancing their applicability in sustainable construction.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106422"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145657835","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 enhancement of mechanical and impermeability properties in self-healing concrete through PVA fiber reinforcement and MICP 聚乙烯醇纤维增强和MICP对自愈混凝土力学性能和抗渗性能的协同增强

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-16 DOI: 10.1016/j.cemconcomp.2025.106450

Lu Jiang , Hongrui Ma , Sisi Hu , Xiangbi Zhao , Wenjing Wang , Yu Zhang , Yuanzhen Liu

{"title":"Synergistic enhancement of mechanical and impermeability properties in self-healing concrete through PVA fiber reinforcement and MICP","authors":"Lu Jiang , Hongrui Ma , Sisi Hu , Xiangbi Zhao , Wenjing Wang , Yu Zhang , Yuanzhen Liu","doi":"10.1016/j.cemconcomp.2025.106450","DOIUrl":"10.1016/j.cemconcomp.2025.106450","url":null,"abstract":"<div><div>The mechanical strength and impermeability of concrete are critical to its structural reliability and long-term durability. However, conventional concrete lacks autonomous crack-healing capacity, which can lead to progressive degradation under sustained mechanical and environmental stresses. This study presents a novel self-healing concrete system incorporating polyvinyl alcohol (PVA) fibers and microbially induced calcium carbonate precipitation (MICP), designed to synergistically improve both material performance and crack-sealing efficiency. Experimental results indicate that the inclusion of PVA fibers significantly enhances mechanical and durability properties. Compared to plain concrete, the 28-day compressive and flexural strengths increased by 32.47 % and 22.54 %, respectively, while water penetration depth was reduced by 23.25 %. Moreover, the relative permeability coefficient and volume of harmful capillary pores decreased by 50.81 % and 19.27 %, respectively. After 28 days of autonomous healing, the specimens exhibited a compressive strength recovery rate of 66.59 % and an ultrasonic pulse velocity recovery of 58.82 %. Microstructural analysis confirmed the precipitation of dense calcite crystals within cracks, contributing to pore refinement and intrinsic property enhancement. This work not only advances the autonomous healing capability of concrete but also substantially improves its mechanical and impermeable performance, offering a promising strategy for developing highly durable construction materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106450"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145798544","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

Microfibre-reinforced cementitious materials for preventive concrete pavement crack repair: Balancing extrusion-based crack-filling with mechanical performance 预防性混凝土路面裂缝修补用微纤维增强胶凝材料：用力学性能平衡挤压填充裂缝

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-29 DOI: 10.1016/j.cemconcomp.2025.106460

Damian Palin , Jie Xu , Christos Vlachakis , Michael Ambrose , Fumiya Iida , Abir Al-Tabbaa

{"title":"Microfibre-reinforced cementitious materials for preventive concrete pavement crack repair: Balancing extrusion-based crack-filling with mechanical performance","authors":"Damian Palin , Jie Xu , Christos Vlachakis , Michael Ambrose , Fumiya Iida , Abir Al-Tabbaa","doi":"10.1016/j.cemconcomp.2025.106460","DOIUrl":"10.1016/j.cemconcomp.2025.106460","url":null,"abstract":"<div><div>Preventive repair of cracked concrete pavements requires materials that balance effective extrusion and crack-filling with high mechanical performance. Here, we present a polyvinyl alcohol microfibre (PVAF)-reinforced commercial belitic calcium sulphoaluminate mortar, engineered with this balance. A fresh mix of the mortar plus 1 % (w/w) of a water reducer and up to 0.6 % (v/v) of short (∼1–2 mm) PVAF could be extruded and fill cracks 6 mm wide. Cracked concrete specimens repaired with this material under flexural loading exhibited a 30 % increase in ultimate strength and twice the modulus, strain at failure, toughness and residual strength compared to plain RS. Under slant shear loading, repaired specimens demonstrated a modest increase in slant shear strength. These enhancements are attributed to fibre-induced crack bridging within the repair materials and reduced stress concentration at the repair interfaces. To accelerate material development, we implemented a rapid real-to-simulation workflow that reduced the crack-filling screening time for a material from several hours to less than 1 h.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106460"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881043","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 wet joints on the shrinkage effects in steel-UHPC composite bridge decks: Monitoring and parametric analysis 湿缝对钢- uhpc组合桥面收缩影响的监测与参数分析

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2026-03-01 Epub Date: 2025-12-15 DOI: 10.1016/j.cemconcomp.2025.106438

Han Xiao , Wei Wang , Chen Xu , Biao Ma , Zhiping Yu , Huidan Xu

{"title":"Influence of wet joints on the shrinkage effects in steel-UHPC composite bridge decks: Monitoring and parametric analysis","authors":"Han Xiao , Wei Wang , Chen Xu , Biao Ma , Zhiping Yu , Huidan Xu","doi":"10.1016/j.cemconcomp.2025.106438","DOIUrl":"10.1016/j.cemconcomp.2025.106438","url":null,"abstract":"<div><div>Ultra-high-performance concrete (UHPC) with a superior tensile mechanical property and durability is good for composite bridge deck overlays. However, its shrinkage effect may result in higher secondary stresses by the steel-UHPC interlayer interaction. Wet joints between UHPC segments, essential for construction, may make the secondary stresses more complicated to evaluate and address. So far, research regarding shrinkage-induced stress for joints in a composite system is quite limited and thus the mechanical mechanism has been rarely understood. To this end, 4 segmental composite girder specimens were manufactured for conducting static standing shrinkage effect monitoring. Numerical simulations were also executed concerning the effects of age differences, joint shapes, and reinforcement ratios. The monitoring results indicated that the UHPC shrinkage-induced strain distribution pattern as well as the level in the composite systems respectively with and without joints differs from each other. The simulation and parametrical analysis results indicated that rectangular and dovetailed joints exhibit lower interfacial tensile stresses due to enhanced contact area and shear resistance, while a critical 2-day casting time limit is identified to prevent joint tensile failure. Additionally, a higher reinforcement ratio could induce an increase in the shrinkage induced secondary stresses., while it will reduce the contribution of the steel plates and welded studs. The research results provide fundamental knowledge for the shrinkage mechanism understanding of wet joints in such UHPC composite systems. This is important for optimizing joint design and construction practices.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"167 ","pages":"Article 106438"},"PeriodicalIF":13.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145753292","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