Cement & concrete composites最新文献_第7页

A comprehensive experimental investigation on tire char replacement in geopolymer concrete: Mechanical and fracture features 地聚合物混凝土中轮胎炭替换的综合试验研究：力学和断裂特征

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-09 DOI: 10.1016/j.cemconcomp.2025.106286

Hakan Bayrak , Muhammed Gümüş , Rıdvan Yakut , Jülide Erkmen

{"title":"A comprehensive experimental investigation on tire char replacement in geopolymer concrete: Mechanical and fracture features","authors":"Hakan Bayrak , Muhammed Gümüş , Rıdvan Yakut , Jülide Erkmen","doi":"10.1016/j.cemconcomp.2025.106286","DOIUrl":"10.1016/j.cemconcomp.2025.106286","url":null,"abstract":"<div><div>In alignment with the carbon-neutral objective, environmentally friendly construction materials, such as geopolymers, have garnered significant interest due to their by-product constituents and reduced carbon emissions throughout the manufacturing process compared to conventional cementitious concretes. Notwithstanding the current fascination with green concretes, the impact of tire char on the mechanical and fracture characteristics of geopolymer concrete has been overlooked. This study examines the reclamation of tire char as a by-product of pyrolysis in the geopolymer mix. Both fine and coarse aggregates were systematically substituted with tire char from 0 % to 12 % in 2 % increments. A total of 21 bending prisms, measuring 100 × 100 × 400 mm, were cast using 7 unique geopolymer blends. The specimens were subjected to deflection-controlled loading via a three-point bending test following the creation of a central edge notch on the test specimens. The 2D digital image correlation (DIC) was employed to get the deflection and strain map under successively rising deflection loadings. After the bending test, axial compressive forces were exerted on the fractured segments of the bending prisms. The experimental results were analyzed from several perspectives, including (i) axial compressive strength, (ii) flexural strength, (iii) fracture energy, and (iv) unstable fracture toughness. Compressive strength increased by 39.9 % as a result of substituting tire char at a ratio of 12 %. Substituting 4 % tire char into the mixture improved the mean flexural strength by about 40.8 %. Similarly, the mean fracture energy also showed an increasing trend beyond the 4 % tire char replacement.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106286"},"PeriodicalIF":13.1,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144802860","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 effect of sand size, sand-to-binder ratio, and water-to-binder ratio on micro- and macro-mechanical properties of HS-ECC 研究了砂粒度、砂胶比、水胶比对HS-ECC微观和宏观力学性能的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-09 DOI: 10.1016/j.cemconcomp.2025.106285

Hongwei Zhang , Zemei Wu , Huiyuan Liu , Xiang Hu , Zhimin Tian , Caijun Shi

{"title":"Insight into the effect of sand size, sand-to-binder ratio, and water-to-binder ratio on micro- and macro-mechanical properties of HS-ECC","authors":"Hongwei Zhang , Zemei Wu , Huiyuan Liu , Xiang Hu , Zhimin Tian , Caijun Shi","doi":"10.1016/j.cemconcomp.2025.106285","DOIUrl":"10.1016/j.cemconcomp.2025.106285","url":null,"abstract":"<div><div>This study quantitatively evaluates the effects of mixture design parameters, including maximum sand size (<em>d</em><sub>max</sub>: 0.6–2.36 mm), sand-to-binder ratio (<em>s/b</em> ratio: 0.2 to 0.6), and water-to-binder ratio (<em>w/b</em> ratio: 0.16 to 0.22), on the micromechanical properties of high-strength engineered cementitious composites (HS-ECC) using a factorial design approach. Statistical equations that account for the coupling effects of mixture design parameters were developed to predict micromechanical properties. Based on the developed equations and micromechanical theory, the mixture with 2.36 mm <em>d</em><sub>max</sub>, 0.6 s/b ratio, and 0.197 <em>w/b</em> ratio was determined as the optimum HS-ECC mixture. The experimental pseudo strain-hardening behavior trend was consistent with predictions. Incorporation of large-size sand modified flaw distributions, thereby improving tensile ductility and promoting saturated multiple cracking. However, improved flaw distribution does not guarantee high ductility; attention must also be given to the increased flaw quantity. Regression equations linking micromechanical parameters to tensile strength and strain capacity were proposed and experimentally validated. The fiber-matrix bond was the key factor affecting tensile strength, while matrix fracture toughness significantly impacted tensile strain capacity. The regression equations linking micromechanical parameters with tensile properties offer a valuable tool for designing HS-ECC properties to meet various structural requirements.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106285"},"PeriodicalIF":13.1,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144802859","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

Utilization of granite sludge in the production of low carbon cement composites after coupled mechanical and CO2 activation (CMCA) 机械- CO2耦合活化（CMCA）花岗岩污泥在低碳水泥复合材料生产中的应用

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-07 DOI: 10.1016/j.cemconcomp.2025.106284

Jiashuo Zhang, Yong Zheng, Yingliang Zhao, Kai Cui, Peiliang Shen, Chi Sun Poon

{"title":"Utilization of granite sludge in the production of low carbon cement composites after coupled mechanical and CO2 activation (CMCA)","authors":"Jiashuo Zhang, Yong Zheng, Yingliang Zhao, Kai Cui, Peiliang Shen, Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106284","DOIUrl":"10.1016/j.cemconcomp.2025.106284","url":null,"abstract":"<div><div>Granite sludge (GS), as an industrial byproduct, has caused serious pollution and waste of resources. To reduce the environmental impact and achieve resource utilization, this study adopted two mechanochemical treatment methods, mechanical activation and coupled mechanical and CO<sub>2</sub> activation (CMCA), to treat GS to prepare a new low-carbon cement. After CMCA treatment, the compressive strength increased significantly in both early and late stages, reaching 5.5 MPa at 1 d and 38.19 MPa at 28 d. After the addition of sodium silicate, the compressive strength reached 5.87 MPa and 39.76 MPa at 1 d and 28 d, respectively. This performance improvement is attributed to synergistic physical and chemical activation. Physically, the treatment refines the particles to the 1–10 μm range and increases the specific surface area, thereby providing a large number of nucleation sites to accelerate early hydration. Chemically, the CMCA process generates highly active metastable calcium carbonate. The metastable calcium carbonate generated has high reactivity, and its significant nucleation effect promotes the overall hydration process. These highly active particle surfaces act as effective chemical nucleation sites, accelerating the formation of C-S-H gel. At the same time, the metastable calcium carbonate also directly participates in the reaction, reacting with the aluminate in the cement to generate additional reinforcing phases such as Mc and Hc. After adding sodium silicate, the generated silica gel has pozzolanic activity, which can not only undergo secondary hydration reaction with CH to generate more C-S-H, but also accelerate the overall hydration reaction and further improve the compressive strength. This method shows broad application prospects in industrial solid waste utilization and low-carbon cement production and has significant environmental benefits and resource utilization potential.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106284"},"PeriodicalIF":13.1,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797356","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

Redefining the cement substitution potential of recycled concrete powder using graphene oxide coating 重新定义使用氧化石墨烯涂层的再生混凝土粉的水泥替代潜力

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-06 DOI: 10.1016/j.cemconcomp.2025.106276

Yuan Gao , Fufu Zou , Siyao Wang , Hao Sui , Jiajian Yu , Bin Xu , Weiqiang Chen , Yanming Liu

{"title":"Redefining the cement substitution potential of recycled concrete powder using graphene oxide coating","authors":"Yuan Gao , Fufu Zou , Siyao Wang , Hao Sui , Jiajian Yu , Bin Xu , Weiqiang Chen , Yanming Liu","doi":"10.1016/j.cemconcomp.2025.106276","DOIUrl":"10.1016/j.cemconcomp.2025.106276","url":null,"abstract":"<div><div>Reutilizing recycled concrete powder (RCP) offers substantial benefits in the construction industry. However, increasing RCP's substitution rate in cementitious composites often leads to significant deterioration in properties. In this study, we propose an innovative approach to enable high substitution rates of RCP by uniformly coating its particles with graphene oxide (GO) nanosheets. In this way, the modification effect is concentrated at the interfacial transition zone (ITZ), thereby maximizing the reinforcing benefits of GO. Our results show that GO-coated RCP can be used to replace up to 40 wt% of cement, while still achieving improvements of 4.1 % in compressive strength and 10.2 % in flexural strength compared to pure cement slurry. Microstructural characterization reveals that the coated GO enhances the composite structure through nucleation and pore-infilling effects, leading to a reduction in porosity by 9.4–20.3 %. Molecular dynamics simulations further reveal the crack-bridging mechanism of GO, showing that the failure mode of the RCP-cement composite shifts from the ITZ to the C-S-H matrix. Our approach also has significant economic and environmental potential. At a 40 % RCP substitution rate, greenhouse gas emissions and primary energy demand per unit compressive strength are reduced by approximately 39.7 % and 40.2 %, respectively, compared to plain cement slurry. The findings of this study not only deepen the understanding of GO reinforcement mechanisms but also promote the broader application of RCP in developing cost-effective and environmentally friendly cementitious composites for future construction.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106276"},"PeriodicalIF":13.1,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780098","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

Tensile fracture behavior and notch-insensitive mechanism of Strain-Hardening Cementitious Composites (SHCC) with recycled fine aggregates 再生细集料应变硬化胶凝复合材料（SHCC）拉伸断裂行为及缺口不敏感机理

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-06 DOI: 10.1016/j.cemconcomp.2025.106281

Han Zhang , Bo-Tao Huang , Qing-Hua Li , Qing-Min Wang , Chao-Kun Hong , Shi-Lang Xu

{"title":"Tensile fracture behavior and notch-insensitive mechanism of Strain-Hardening Cementitious Composites (SHCC) with recycled fine aggregates","authors":"Han Zhang , Bo-Tao Huang , Qing-Hua Li , Qing-Min Wang , Chao-Kun Hong , Shi-Lang Xu","doi":"10.1016/j.cemconcomp.2025.106281","DOIUrl":"10.1016/j.cemconcomp.2025.106281","url":null,"abstract":"<div><div>Enhancing the material sustainability and understanding the tensile fracture behavior of Ultra-High-Toughness Cementitious Composites (UHTCC) are of great significance for large-scale structural applications. In this study, we designed and developed green UHTCC incorporating recycled fine aggregates (RA) with the maximum particle sizes of 1.18, 2.36, and 4.75 mm. A comprehensive investigation of compressive strength, microstructures, and notched/unnotched tensile performance was conducted. Compared to silica sand UHTCC (SS-UHTCC), the compressive strength of RA-UHTCC decreased by 10.2 % and 12.2 % using 1.18- and 2.36-mm RA, respectively, due to weaker interfacial transition zones (ITZ), while UHTCC with 4.75-mm RA exhibited a slight increase in strength due to fewer ITZ. Unnotched tensile performance of RA-UHTCC showed slight reductions in tensile strength and ductility with increasing RA size, but all the RA-UHTCC maintained multiple cracking behavior. For notched tensile performance, the nominal tensile strength of RA-UHTCC was close to or slightly higher than their unnotched counterparts, with notch strength ratios (<em>NSR</em>) between 1.01 and 1.11. All the notched RA-UHTCC demonstrated multiple cracking, particularly in the notched regions, and the tensile ductility decreased with increasing notch length. Overall, UHTCC using 1.18- and 2.36-mm RA exhibited mechanical properties comparable to SS-UHTCC. All the RA-UHTCC displayed notch insensitivity and the <em>NSR</em> was higher than those of ordinary cementitious materials, alumina ceramic, and Poly (ethyl methacrylate) (PMMA) glass, and the mechanism behind it was also revealed.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106281"},"PeriodicalIF":13.1,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144787579","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

Uncover the thermal behavior of geopolymer: insights from in-situ high temperature exposure 揭示地聚合物的热行为：来自原位高温暴露的见解

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-06 DOI: 10.1016/j.cemconcomp.2025.106282

Y. Luo , K.M. Klima , S. Melzer , H.J.H. Brouwers , Qingliang Yu

{"title":"Uncover the thermal behavior of geopolymer: insights from in-situ high temperature exposure","authors":"Y. Luo , K.M. Klima , S. Melzer , H.J.H. Brouwers , Qingliang Yu","doi":"10.1016/j.cemconcomp.2025.106282","DOIUrl":"10.1016/j.cemconcomp.2025.106282","url":null,"abstract":"<div><div>The understanding of geopolymers' behavior at elevated temperatures is lacking due to the most focuses on post-situ research, leading to unsubstantiated expectations of in-situ thermal performance. This work systematically investigates the in-situ thermal behavior of geopolymers, including phase changes, deformation, and mechanical performance, following a comparison between in-situ and ex-situ properties. The results reveal a notable discrepancy between the in-situ and ex-situ thermal performance of geopolymers. During heating, geopolymers shift from a brittle to a ductile state by physicochemical transformation, facilitating accommodation of thermal incompatibilities. As we observed, the in-situ mechanical strength and creep strain increase until partial melting, with higher Na<sub>2</sub>O% accelerating melting of geopolymer. During cooling, geopolymers undergo matrix shrinkage and cracking, which impairs ex-situ performance. A denser matrix provides superior in-situ strength, while its high stiffness negatively impacts structural integrity during cooling, further reducing residual strength. These findings highlight the limitations of ex-situ experiments in estimating high-temperature performance of geopolymers. To accurately predict the in-situ thermal performance, future ex-situ research must account for partial melting during heating and deterioration induced by cooling.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106282"},"PeriodicalIF":13.1,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792855","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 amino acids on the properties of carbonated pseudowollastonite composites: Development of a high-reactivity CO2 sequestration binder 氨基酸对碳酸化假硅灰石复合材料性能的影响：一种高反应性CO2封存粘合剂的研制

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-06 DOI: 10.1016/j.cemconcomp.2025.106278

Junil Pae , Namkon Lee , Juhyuk Moon

{"title":"Influence of amino acids on the properties of carbonated pseudowollastonite composites: Development of a high-reactivity CO2 sequestration binder","authors":"Junil Pae , Namkon Lee , Juhyuk Moon","doi":"10.1016/j.cemconcomp.2025.106278","DOIUrl":"10.1016/j.cemconcomp.2025.106278","url":null,"abstract":"<div><div>This study investigated the influence of amino acids (L-glutamic and L-aspartic acid) on the compressive strength, mineral carbonation, and microstructure of carbonation-cured pseudowollastonite pastes. Pseudowollastonite was synthesized without a compaction step, and its potential as a CO<sub>2</sub> sequestration binder was evaluated. The results indicated that the effects of amino acids with a concentration of 0.5 % and 1 % varied significantly. The addition of 0.5 % amino acids enhanced compressive strength up to 24.0 %, compared to the control. Calcite, vaterite, and amorphous CaCO<sub>3</sub> (ACC) were identified as the CaCO<sub>3</sub> phases in the pastes. The introduction of 0.5 % amino acids promoted ACC formation in the early stage, followed by almost complete recrystallization of ACC into calcite. In addition, the use of amino acids enhanced internal carbonation and inhibited the macro crack formation, contributing to the improved compressive strength of the pastes. It was confirmed that volume fraction of cracks governs the carbonation degree of the pastes with amino acids as well as compressive strength. Considering that pseudowollastonite exhibits the highest carbonation reactivity among wollastonite polymorphs, incorporating amino acids into pseudowollastonite rather than natural wollastonite may offer a promising approach for producing an ultra-low calcium, highly reactive CO<sub>2</sub> sequestration binder.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106278"},"PeriodicalIF":13.1,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144787578","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

Dual effects of phytic acid on reinforced low-carbon mortar: Dealkalization of red mud and improvement of corrosion resistance 植酸对增强低碳砂浆的双重作用：赤泥脱钾和提高其耐蚀性

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-05 DOI: 10.1016/j.cemconcomp.2025.106274

Xiaocheng Zhou, Zhi Geng, Jinjie Shi

引用次数: 0

Enhancing concrete's resistance to ASR by integrating metakaolin-carbon nanotube blends 偏高岭土-碳纳米管共混物增强混凝土抗ASR性能

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-05 DOI: 10.1016/j.cemconcomp.2025.106273

Panagiotis A. Danoglidis, Rohitashva Kumar Singh, Maria S. Konsta-Gdoutos

{"title":"Enhancing concrete's resistance to ASR by integrating metakaolin-carbon nanotube blends","authors":"Panagiotis A. Danoglidis, Rohitashva Kumar Singh, Maria S. Konsta-Gdoutos","doi":"10.1016/j.cemconcomp.2025.106273","DOIUrl":"10.1016/j.cemconcomp.2025.106273","url":null,"abstract":"<div><div>Alkali-silica reaction (ASR) is a destructive reaction that occurs in concrete when reactive aggregates are involved and usually leads to premature loss of serviceability of the structure. Understanding the conditions in nano- and micro-scale that promote the generation of the ASR gel is crucial to control the rate of expansion and limit the course of the ASR. In this study, metakaolin (MK) blends reinforced with dispersed carbon nanotubes (CNTs) have been proposed for mitigating ASR expansion. Addition of up to 20 wt% MK is known to have a modest effect on reducing the ASR expansion and typically the 14-day expansion results exceed the ASTM C1567 0.1 % threshold. While the pozzolanic reaction of MK results in lower availability of calcium ions (Ca<sup>2+</sup>) preventing this way the recycling of alkalis, addition of CNTs is shown to modify the calcium-to-silica (Ca/Si) ratio of Calcium-Silicate-Hydrates (C-S-H) at the interfacial transition zone (ITZ), further enhancing the alkali binding capacity of the cementitious matrix. Furthermore, the synergistic action of MK and CNTs is shown to reduce the rate of expansion with exposure time and keep the 14-day MK-CNT blend expansion value well below the 0.1 % threshold. Since ASR and the degree of expansion can notably affect flexural capacity and reduce compressive strength and Young's modulus, Linear Elastic Fracture Mechanics (LEFM) and uniaxial compression tests were conducted post-ASR to evaluate the effect of the MK-CNT blends on the retained modulus of elasticity and tensile strain energy absorption capacity.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106273"},"PeriodicalIF":13.1,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144772448","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

Sustainable and smart: Piezoresistive cement mortar with conductive polyaniline-modified recycled plastics 可持续和智能：压阻水泥砂浆与导电聚苯胺改性再生塑料

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-08-05 DOI: 10.1016/j.cemconcomp.2025.106269

Ahmed Al-Mansour , Gonghui Gu , Nanxi Dang , Rijiao Yang , Rongjia Wen , W.A.H. Mashrah , Chuanqing Fu , Qiang Zeng

{"title":"Sustainable and smart: Piezoresistive cement mortar with conductive polyaniline-modified recycled plastics","authors":"Ahmed Al-Mansour , Gonghui Gu , Nanxi Dang , Rijiao Yang , Rongjia Wen , W.A.H. Mashrah , Chuanqing Fu , Qiang Zeng","doi":"10.1016/j.cemconcomp.2025.106269","DOIUrl":"10.1016/j.cemconcomp.2025.106269","url":null,"abstract":"<div><div>Direct replacement of aggregates with recycled plastics generally weakens the strength of the cement composite and decreases its electrical conductivity. This study presents a sustainable, cost-effective alternative by coating waste plastics with polyaniline, a conductive polymer, using a rapid 1-min microwave process that forms a stable coating with minimal polymer use. The coated plastics mitigate strength loss typically seen with plastic aggregates, while improving pore structure and reducing water sorptivity by nearly one-third. Electrical conductivity was enhanced, with resistivity reduced by one order of magnitude compared to conventional mortar, and a notable fractional change in resistivity (FCR) of nearly 12 % under compressive loading. The polyaniline coating decreased the porosity of the interfacial transition zone (ITZ) by 35 % and contributed negligible CO<sub>2</sub> emissions during implementation. The findings offer a promising step toward eco-friendly, smart construction materials that convert waste into functional value.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106269"},"PeriodicalIF":13.1,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144772508","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