Cement & concrete composites最新文献_第9页

Effect of copper-coated carbon fiber on the electromechanical and chloride extraction properties of cement-based anode materials 包铜碳纤维对水泥基负极材料机电性能和氯离子萃取性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-25 DOI: 10.1016/j.cemconcomp.2025.106006

Penggang Wang , Weichao Li , Hua Fu , Haitao Zhao , Chuansheng Xiong , Tao Liu , Chenglong Li

{"title":"Effect of copper-coated carbon fiber on the electromechanical and chloride extraction properties of cement-based anode materials","authors":"Penggang Wang , Weichao Li , Hua Fu , Haitao Zhao , Chuansheng Xiong , Tao Liu , Chenglong Li","doi":"10.1016/j.cemconcomp.2025.106006","DOIUrl":"10.1016/j.cemconcomp.2025.106006","url":null,"abstract":"<div><div>This study addressed the critical issue of ionic erosion in reinforced concrete structures exposed to coastal environments by developing a novel conductive cementitious anode material for chloride extraction, thereby enhancing steel reinforcement protection. The research focused on the preparation of copper-coated carbon fiber (PDA-CF-Cu) utilizing polydopamine (PDA) as an intermediary, coupled with electrochemical deposition for surface metallization of carbon fibers (CF). A multifunctional new type of conductive cementitious anode material was prepared.The microstructure and elemental changes of CF and PDA-CF-Cu were investigated. The effects of CF and PDA-CF-Cu on the electrical conductivity, piezoresistance and chloride extraction properties of cement-based anode materials at different doses were also investigated.The microstructure showed that the material deposited on the CF surface was dominated by Cu with fewer copper oxides. The introduction of PDA significantly enhanced the adhesion of the metal coating to the CF surface, where the bond strength of PDA-CF-Cu increased by 17 times. The best quality of the plated layer was achieved at coating parameters of 1V - 1h. The electrical conductivity of PDA-CF-Cu increased by a factor of 26 compared to CF. The conductive mortar containing PDA-CF-Cu exhibited higher piezoresistive stability and sensitivity compared to CF conductive mortar. At 28 d, the conductivities of 0.2 wt%, 0.4 wt%, and 0.6 wt% doping increased by 653.64 %, 172.74 %, and 25.34 %, respectively. In addition, the PDA-CF-Cu conductive mortar exhibited better chloride extraction efficiency. The chloride extraction efficiency of PDA-CF-Cu conductive mortar exhibited enhancements of 8.63 % and 14.36 % for the respective fiber dosages of 0.2 wt% and 0.4 wt%.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 106006"},"PeriodicalIF":10.8,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143486549","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 electrothermal, thermoelectric, and current discharge properties of alkali-activated materials: Implications for energy conversion 碱活化材料的电热、热电和电流放电特性的表征和分析：对能量转换的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-24 DOI: 10.1016/j.cemconcomp.2025.105987

Xingyu Qu , Tong Guo , Jingming Cai , Yang Hu , Bo-Tao Huang , Tianyu Xie

{"title":"Characterization and analysis of electrothermal, thermoelectric, and current discharge properties of alkali-activated materials: Implications for energy conversion","authors":"Xingyu Qu , Tong Guo , Jingming Cai , Yang Hu , Bo-Tao Huang , Tianyu Xie","doi":"10.1016/j.cemconcomp.2025.105987","DOIUrl":"10.1016/j.cemconcomp.2025.105987","url":null,"abstract":"<div><div>Alkali-activated mortar (AAM) show promising potential for net-zero energy buildings due to their excellent electrical conductivity. This study investigates the multifunctional properties of AAM for energy conversion applications, examining the influence of conductive fillers and additives on AAM's mechanical and electrical properties, the effects of curing age, moisture content, temperature, and applied load on AAM's resistivity, and exploring its electrothermal, thermoelectric, and current discharge properties. Key findings reveal that conductive fillers and additives enhance AAM's conductivity but decrease the mechanical properties, while an equivalent circuit diagram accurately describes AAM's electrochemical impedance spectroscopy. AAM's resistivity increases with curing age and moisture loss but decreases with rising temperature and applied load. The material demonstrates stable and efficient electrical-to-thermal energy conversion across various voltages, with plain AAM exhibiting a superior Seebeck coefficient of 1353 μV/°C, outperforming OPC-based systems in thermoelectric properties. Notably, an Al-AAM-Cu battery maintains a current density above 2 mA/m<sup>2</sup> for 79 h, meeting ISO standards for impressed current cathodic protection of steel reinforcement in concrete structures. These results highlight AAM's potential as a multifunctional material for energy harvesting, storage, and corrosion protection in sustainable construction applications, paving the way for innovative solutions in energy-efficient building design.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 105987"},"PeriodicalIF":10.8,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474537","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

Mix proportion design of phosphoric acid-activated cementitious materials and microstructure evolution at high temperature 磷酸活化胶凝材料配合比设计及高温下微观结构演变

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-21 DOI: 10.1016/j.cemconcomp.2025.106003

Linhui Meng , Fuchang Ouyang , Jiaxin Cheng , Ziming Wang , Bingqian Li , Xi Xu , Ping Duan , Yingcan Zhu , Zuhua Zhang , Ming Chen , Wentao Huang

{"title":"Mix proportion design of phosphoric acid-activated cementitious materials and microstructure evolution at high temperature","authors":"Linhui Meng , Fuchang Ouyang , Jiaxin Cheng , Ziming Wang , Bingqian Li , Xi Xu , Ping Duan , Yingcan Zhu , Zuhua Zhang , Ming Chen , Wentao Huang","doi":"10.1016/j.cemconcomp.2025.106003","DOIUrl":"10.1016/j.cemconcomp.2025.106003","url":null,"abstract":"<div><div>To clarify the polymerization mechanism and high-temperature resistance of acid-activated cementitious materials. In this study, metakaolin was used as precursor, phosphoric acid solution served as the activator, and 0–6% of magnesia was incorporated to prepare acid-activated cementitious materials. The effects of P/Al (molar ratio of phosphorus to aluminum), L/S (mass ratio of activator to raw material) and magnesia dosage (W<sub>MgO</sub>) on the mechanical properties and high temperature resistance of acid-activated cementitious materials were investigated. This study elucidated the effects, mechanism and microstructure evolution associated with phosphoric acid activation. The optimal formulation of the acid-activated cementitious material is characterized by a P/Al ratio of 0.8, an L/S ratio of 0.9, and a W<sub>MgO</sub> of 4 %. Under these conditions, the compressive strength at 28 d can reach 101 MPa. Metakaolin is depolymerized in an acidic environment provided by phosphoric acid to produce oligomeric silicon and Al<sup>3+</sup>, which then undergo a polycondensation bonding process with PO<sub>4</sub><sup>3−</sup> to form an amorphous gel. Magnesia reacts with phosphoric acid to form MgHPO<sub>4</sub> 3H<sub>2</sub>O, which then adheres to the dealuminated silica layer of metakaolin to form an acid-activated cementitious material. After calcination at 1200 °C, the acid-activated cementitious material with a P/Al ratio of 0.6 and an L/S ratio of 0.9, and without magnesia, exhibited the best performance, with a residual strength of 39.7 MPa.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 106003"},"PeriodicalIF":10.8,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143462275","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}

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Porous biochar-assisted aqueous carbonation of steel slag as an adsorptive crystallization modifier for value-added cement applications 多孔生物炭辅助钢渣水碳酸化作为增值水泥吸附结晶改性剂的研究

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-20 DOI: 10.1016/j.cemconcomp.2025.106002

Linshan Li , Yi Jiang , Tiefeng Chen , Xiaojian Gao

{"title":"Porous biochar-assisted aqueous carbonation of steel slag as an adsorptive crystallization modifier for value-added cement applications","authors":"Linshan Li , Yi Jiang , Tiefeng Chen , Xiaojian Gao","doi":"10.1016/j.cemconcomp.2025.106002","DOIUrl":"10.1016/j.cemconcomp.2025.106002","url":null,"abstract":"<div><div>Carbonated steel slag shows promise as a supplementary cementitious material. However, prolonged carbonation forms a dense CaCO<sub>3</sub> layer, limiting carbonation efficiency and hydration activity, while uneven CaCO<sub>3</sub> accumulation limits its performance in cement. This study introduces biochar as a nucleating agent to enhance the carbonation and hydration activity of steel slag. Results show that biochar, particularly rice husk biochar, effectively promotes CO<sub>2</sub> capture (38.1 % increase) and improves mechanical properties (33.4 % improvement) by optimizing microstructure and carbonation efficiency. Reed biochar's fibrous structure optimized CaCO<sub>3</sub> packing best, while bamboo biochar accelerated slag hydration, raising cumulative hydration heat by 1.8 % and C-S-H gel content by 86.7 %. Results confirm that biochar's abundant active nucleation sites, functional groups, and diffuse porosity greatly promote CaCO<sub>3</sub> crystal growth while preventing excessive surface accumulation, enabling the filling and nucleation effects of CaCO<sub>3</sub> to be fully realized in cement system. These findings highlight biochar's potential as a cost-effective modifier for sustainable cementitious applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 106002"},"PeriodicalIF":10.8,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143452239","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}

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Synergistic effects of nano-alumina and triisopropanolamine in Portland limestone cements with various sulfate levels 纳米氧化铝和三异丙醇胺在不同硫酸盐水平硅酸盐水泥中的协同作用

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-19 DOI: 10.1016/j.cemconcomp.2025.105994

Sungwon Sim , Heongwon Suh , Seongmin Cho , Sumin Im , Jaeyeon Park , Junxing Liu , Sungchul Bae

引用次数: 0

Enhancing the rate-dependent cracking resistance of UHPC under mixed tensile-shear mode by calcined bauxite aggregate 煅烧铝土矿骨料增强超高性能混凝土拉剪混合模式下速率相关抗裂性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-18 DOI: 10.1016/j.cemconcomp.2025.105993

Shaohua Li , Ole Mejlhede Jensen , Qingliang Yu

{"title":"Enhancing the rate-dependent cracking resistance of UHPC under mixed tensile-shear mode by calcined bauxite aggregate","authors":"Shaohua Li , Ole Mejlhede Jensen , Qingliang Yu","doi":"10.1016/j.cemconcomp.2025.105993","DOIUrl":"10.1016/j.cemconcomp.2025.105993","url":null,"abstract":"<div><div>Calcined bauxite (CB) aggregate, characterized by porous microstructure and strong micromechanical property, has potential to mitigate macroscopic mechanical degradation of Ultra-high Performance Concrete (UHPC) from autogenous shrinkage microcracks. However, the rate-dependent cracking resistance of UHPC containing CB (UHPC-CB) under mixed-mode loading condition is not clear. Herein, the enhancing mechanism of CB upon rate-dependent cracking resistance of UHPC under mixed-mode loading is clarified from a multi-scale perspective. The results indicate that, at the microscale, CB not only leads to shorter microcracks due to physical constraint effects, but also results in a stronger ITZ compared to UHPC containing basalt aggregate (UHPC-BA), due to an internal curing effect thanks to its porous microstructure. At the mesoscale, the denser ITZ results in a higher fracture percentage of CB and more obviously an interlock effect in the case of shear stress condition. Consequently, at the macroscale, CB not only results in higher cracking resistance, especially in the case of shear loading, but also a higher dynamic increase factor value, attributed to the heterogenous micromechanical characteristics and stronger phases in CB.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 105993"},"PeriodicalIF":10.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143443824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Reaction mechanisms of one-part and two-part slag-based binders activated by sodium carbonate and lime 用碳酸钠和石灰活化单组分和双组分矿渣基粘结剂的反应机理

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-17 DOI: 10.1016/j.cemconcomp.2025.105992

Xiaojuan Kang, Zushi Tian, Clarence Edward Choi, Hailong Ye

{"title":"Reaction mechanisms of one-part and two-part slag-based binders activated by sodium carbonate and lime","authors":"Xiaojuan Kang, Zushi Tian, Clarence Edward Choi, Hailong Ye","doi":"10.1016/j.cemconcomp.2025.105992","DOIUrl":"10.1016/j.cemconcomp.2025.105992","url":null,"abstract":"<div><div>One-part alkali-activated slag (AAS) is a safer and more manageable alternative to a two-part formulation. This work compares the reaction mechanism, phase formation, microstructure and properties developments between one-part and two-part AAS pastes prepared by a combined lime (CaO) and sodium carbonate (Na<sub>2</sub>CO<sub>3</sub>) activator. The results show that the CaO-Na<sub>2</sub>CO<sub>3</sub> combination effectively accelerates slag reaction, resulting in 3–6 times higher compressive strength in AAS than blended slag-OPC binder at 1 d. Initially, two-part AAS demonstrates a slightly greater accelerating effect due to rapid generation of a strong alkaline condition, characterized by a hydroxyl ion concentration ([OH<sup>−</sup>]) in pore solution that is twice that of one-part AAS. This elevated alkalinity in two-part AAS enhances early-age hydration of slag and promotes phase formation, resulting in increased strength and refined microstructure. However, after 28 d, the strength of one-part AAS approaches and even surpasses that of two-part AAS, attributed to a more stable and progressive reaction between Ca(OH)<sub>2</sub> and dissolving Na<sub>2</sub>CO<sub>3</sub>, which produces NaOH. This steady reaction maintains a stable pH and allows for the gradual release of alkalis, resulting in increased degree of hydration (DOH) of slag, mean chain length (MCL), Al/Si and Q<sup>2</sup>/Q<sup>1</sup> ratios of C-A-S-H, as well as enhanced Al linkage in C-A-S-H of one-part AAS. In addition, the one-part AAS activated by CaO-Na<sub>2</sub>CO<sub>3</sub> demonstrates up to 93 % reduction in CO<sub>2</sub> emissions while maintaining comparable strength to OPC counterparts, highlighting its great potential as a green binder for sustainable construction applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 105992"},"PeriodicalIF":10.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The role of foreign ions in Portland cement production and properties: A state-of-the-art review on phase formation, polymorphism and hydration 外来离子在硅酸盐水泥生产和性能中的作用：相形成、多态和水化的最新进展

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-17 DOI: 10.1016/j.cemconcomp.2025.105989

Ivo C. Carvalho , José S. Andrade Neto , Paulo R. Matos , Barbara Lothenbach , Ana P. Kirchheim

{"title":"The role of foreign ions in Portland cement production and properties: A state-of-the-art review on phase formation, polymorphism and hydration","authors":"Ivo C. Carvalho , José S. Andrade Neto , Paulo R. Matos , Barbara Lothenbach , Ana P. Kirchheim","doi":"10.1016/j.cemconcomp.2025.105989","DOIUrl":"10.1016/j.cemconcomp.2025.105989","url":null,"abstract":"<div><div>Adopting alternative raw materials and fuels has significantly increased in the last few years. This practice introduces minor constituents (or foreign ions) into cement kilns, influencing the synthesis process and subsequent clinker/cement properties. This paper examined the impact of zinc, titanium, phosphorus, fluorine, and copper on clinker/cement characteristics, focusing on phase formation, polymorphism, and hydration behavior. These constituents often serve as mineralizers or fluxes, modifying melting temperatures and viscosity of the melt in kilns and/or altering clinker mineralogy. A general trend of hydration retardation was identified in the presence of these minor constituents, with threshold incorporation levels underlined. Gaps in the current knowledge were identified, such as the effect of foreign ions in polymorphism, especially C<sub>3</sub>A. By synthesizing current research, this work provides valuable insights for the cement industry and the academy. Moreover, it proposes research directions to further understand the effects of co-processing and minor constituents on cement production.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 105989"},"PeriodicalIF":10.8,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427142","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

Competing mechanisms of cement hydrates and anhydrous phases at ambient and 120 °C carbonation 水泥水合物和无水相在环境和120°C碳化时的竞争机制

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-16 DOI: 10.1016/j.cemconcomp.2025.105986

Hao Yu , Yi Jiang , Tung-Chai Ling

{"title":"Competing mechanisms of cement hydrates and anhydrous phases at ambient and 120 °C carbonation","authors":"Hao Yu , Yi Jiang , Tung-Chai Ling","doi":"10.1016/j.cemconcomp.2025.105986","DOIUrl":"10.1016/j.cemconcomp.2025.105986","url":null,"abstract":"<div><div>The carbonation of a fresh cement matrix involves several parallel reactions, including the hydration of anhydrous phases and the carbonation of both anhydrous phases and cement hydrates. This study aims to elucidate the competing mechanisms of anhydrous phases and cement hydrates during high-temperature carbonation. We comparatively investigate the behaviors of three representative precursors (a) fresh cement powder (as a composite system), (b) hydrated cement powder (representing cement hydrates), and (c) steel slag powder (representing anhydrous cement phases) under high-temperature (120 °C) carbonation. By differentiating the concurrent reactions occurring in the fresh cement system, the individual contribution of each material can be identified. The results show that carbonation occurs more significantly on cement hydrates than on anhydrous phases at ambient temperatures, but the trend reverses under high-temperature carbonation. Notably, dicalcium silicate (C<sub>2</sub>S) directly reacts with CO<sub>2</sub> at 120 °C within the fresh cement matrix, producing calcite and a highly polymerized calcium silicate hydrate (C-S-H) gel similar to that of steel slag. This reaction not only contributes to carbonation but also facilitates hydration through its nucleation effect. In contrast, for tricalcium silicate (C<sub>3</sub>S), hydration initiates first, followed by the carbonation of its resultant product, namely portlandite, and subsequently C-S-H.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 105986"},"PeriodicalIF":10.8,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417501","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

Efficiency of steel fibers in geopolymer and Portland cement concrete: Comparative evaluation of fiber bonding and crack bridging stress 钢纤维在土工聚合物和波特兰水泥混凝土中的效率：纤维粘结和裂缝桥接应力的比较评估

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-02-16 DOI: 10.1016/j.cemconcomp.2025.105988

Sohanth Tej Maganty, Kolluru V.L. Subramaniam

{"title":"Efficiency of steel fibers in geopolymer and Portland cement concrete: Comparative evaluation of fiber bonding and crack bridging stress","authors":"Sohanth Tej Maganty, Kolluru V.L. Subramaniam","doi":"10.1016/j.cemconcomp.2025.105988","DOIUrl":"10.1016/j.cemconcomp.2025.105988","url":null,"abstract":"<div><div>The bond of steel fibers with Geopolymer Concrete (GPC) and Portland Cement Concrete (PCC) is evaluated. The pullout response of the steel fiber is related to the cohesive fracture response of steel fiber-reinforced GPC and PCC. The crack propagation in fracture tests of GPC and PCC with hooked-end steel fibers at dosages of 25 kg/m<sup>3</sup> and 45 kg/m<sup>3</sup> is evaluated using digital image correlation (DIC). With the addition of fibers, there is a more significant improvement in the fracture test performance of GPC compared to PCC. The steel fibers demonstrate a higher resistance to pullout from the GPC than the PCC. The dense geopolymer gel around the steel fiber enhances stress transfer, mobilizing significantly higher initial resistance during the fiber pullout. The stronger bond between the GPC matrix and the steel fibers increases the resistance to debonding during the initial stages of fiber pullout. The higher peak pullout load at low slip levels indicates more effective fiber engagement in generating crack-bridging stresses. This enhancement in fiber efficiency to pullout from the GPC matrix results in improved resistance to crack propagation and a significant increase in cohesive stress at small crack openings. The fibers provide better post-cracking load resistance in GPC than PCC, even at a fiber dosage as low as 25 kg/m<sup>3</sup>.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 105988"},"PeriodicalIF":10.8,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427143","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