Cement & concrete composites最新文献

{"title":"Sustainable and smart: Piezoresistive cement mortar with conductive polyaniline-modified recycled plastics","authors":"Ahmed Al-Mansour ,&nbsp;Gonghui Gu ,&nbsp;Nanxi Dang ,&nbsp;Rijiao Yang ,&nbsp;Rongjia Wen ,&nbsp;W.A.H. Mashrah ,&nbsp;Chuanqing Fu ,&nbsp;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 CO₂ 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}

{"title":"Preparation of foam concrete with enhanced thixotropy and optimized pore structure by combining internal foaming method and nanofibrillated cellulose (NFC)","authors":"Chao Liu ,&nbsp;Onuaguluchi Obinna ,&nbsp;Nemkumar Banthia ,&nbsp;Shujun Li ,&nbsp;Yamei Zhang ,&nbsp;Dongshuai Hou ,&nbsp;Shen Wang ,&nbsp;Xujia You ,&nbsp;Yubin Cao ,&nbsp;Junwei Jiang","doi":"10.1016/j.cemconcomp.2025.106271","DOIUrl":"10.1016/j.cemconcomp.2025.106271","url":null,"abstract":"<div><div>Special foam concrete materials exhibiting high static yield stress alongside appropriate or low dynamic yield stress (i.e., high thixotropy) are required in specialized scenarios, including 3D printing, sprayed tunnel linings, and drone construction. This study prepares foam concrete via an internal foaming method using a specialty surfactant and systematically investigates the effects of nanofibrillated cellulose (NFC) on rheological properties, pore parameters, and macroscopic performance. The synergistic combination of internal foaming and NFC incorporation yields foam concrete with superior thixotropic behavior and an optimized pore structure. The results demonstrate that the internal foaming combined with NFC enhances static yield stress while moderately increasing air content, and NFC does not raise the dynamic yield stress, instead, it reduces it in most cases. The effect of NFC on dynamic yield stress varies, depending on the relative influence degree of competing factors, with water consumption dominates. Although NFC decreases the pore sphericity, it significantly refines the pore size distribution and weakens the connectivity between pores of foam concrete. The compressive strength and thermal conductivity of foam concrete are determined by the relative contribution weights of different pore parameters, among which porosity exerts the most significant effect.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106271"},"PeriodicalIF":13.1,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780097","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}

{"title":"Behaviour of a novel functionally graded 3D re-entrant lattice reinforced high-performance concrete under static and dynamic compression","authors":"Yiwei Xuan ,&nbsp;Dianwei Gao ,&nbsp;Mingzhong Zhang","doi":"10.1016/j.cemconcomp.2025.106261","DOIUrl":"10.1016/j.cemconcomp.2025.106261","url":null,"abstract":"<div><div>This paper presents a systematic experimental study on the static and dynamic mechanical behaviour of high-performance concrete (HPC) reinforced with 3D re-entrant lattice, accounting for the effect of functionally gradient design. The uniform 3D re-entrant lattice (U) and the corresponding vertically positively and negatively graded lattices (FG1 and FG2) were designed and manufactured with 3D printing. The plain HPC (P-HPC) and HPC reinforced with U (U-HPC), FG1 (G1-HPC) and FG2 (G2-HPC) were fabricated accordingly. Static compressive and split Hopkinson pressure bar tests were then conducted to investigate the static and dynamic compressive behaviour of 3D re-entrant lattice reinforced HPC under various strain rates (i.e., 0, 28.1, 50.6, 72.0 and 100.6 s⁻¹). Results indicate that the static compressive strength of HPC specimens is slightly improved owing to re-entrant lattice reinforcement, while the static dissipated energy of P-HPC is 55.7 %, 53.2 % and 57.5 % lower than that of U-HPC, G1-HPC and G2-HPC, respectively. Regarding dynamic compressive behaviour, although the dynamic strength of P-HPC is 11.3–24.6 % higher than that of lattice reinforced HPC at a strain rate of around 30 s⁻¹, with the further increase of strain rates, the re-entrant lattice reinforced HPC presents higher strength improvement. G2-HPC has the highest dynamic compressive strength of 198.3 MPa at a strain rate of approximately 100.6 s⁻¹, followed by G1-HPC, P-HPC and U-HPC. At low strain rates, the plain and lattice reinforced HPC exhibit the similar energy absorption. When the strain rate reaches around 100.6 s⁻¹, U-HPC, G1-HPC and G2-HPC exhibit a 29.8 %, 36.8 % and 54.3 %, respectively higher dissipated energy than P-HPC. The gradient design of lattice reinforcement brings a more gradual and smooth dissipation of energy, thereby improving the overall energy absorption capacity. The excellent dynamic compressive behaviour of functionally graded 3D re-entrant lattice reinforced HPC offers a promising solution for protective structures subjected to high strain rates, including impact, blast, and seismic loadings.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106261"},"PeriodicalIF":13.1,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144772510","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}

{"title":"Development of thermo-sensitive core-shell microcapsules fabricated by a facile vibrational melt coating method toward a heat-triggered set on demand of ordinary Portland cement","authors":"Hailong Hu ,&nbsp;Zihao Yu ,&nbsp;Yang Lv ,&nbsp;Hongbo Tan ,&nbsp;Shouwei Jian ,&nbsp;Xiangguo Li ,&nbsp;Baoguo Ma ,&nbsp;Yang Deng ,&nbsp;Dong Wang ,&nbsp;Zhengdong Hong ,&nbsp;Rong Yang ,&nbsp;Jian Huang","doi":"10.1016/j.cemconcomp.2025.106268","DOIUrl":"10.1016/j.cemconcomp.2025.106268","url":null,"abstract":"<div><div>Ordinary Portland cement (OPC) is one of the most widely used building materials, but its hydration and setting are challenging to control on demand. In this article, phase change material (PCM) was successfully coated on the surface of sodium silicate (SS) using a facile vibration coating method to fabricate thermo-sensitive SS@PCM (SP) microcapsules. The microcapsules were utilized to accelerate the hydration and setting of cement paste using heat as a trigger on demand. The results showed that PCM powder can be melted and uniformly coated on the surface of SS to form a core-shell structure, and the heat-triggering temperature of SP microcapsules reached 60 °C. Before heat triggering, the PCM acts as a barrier preventing SS from reacting with OPC so that a long setting time, high fluidity and extremely low dynamic yield stress could be realized. After heat triggering, the PCM shell disintegrated, followed by the release of SS, the accelerator. SS and residual heat accelerated the hydration of OPC, as evidenced by the rapid increase of storage modulus, the rising of loss modulus, and the decrease of loss factor in several minutes. This led to the setting time decreasing from hours to minutes, losing fluidity, and gaining high static yield stress. The PCM usage of 15 % is beneficial for early hydration within 2–4 h and early compressive strength development. A 3D printing test verified that the paste could achieve the goal of setting on demand by simple addition of SP microcapsules and application of heating.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106268"},"PeriodicalIF":13.1,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737501","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}

{"title":"Promotion mechanisms of calcium carbide residue on the early-age hydration of sodium carbonate-activated GBFS materials","authors":"Yuehao Guo ,&nbsp;Yan meng ,&nbsp;Shiyu Zhuang ,&nbsp;Ruiquan Jia ,&nbsp;Jianwei Sun ,&nbsp;Ling Qin","doi":"10.1016/j.cemconcomp.2025.106264","DOIUrl":"10.1016/j.cemconcomp.2025.106264","url":null,"abstract":"<div><div>Sodium carbonate-activated GBFS materials (SCSM) present compelling sustainability advantages, including low-carbon footprint and economic viability. However, its long setting time and low early strength limit its practical application. In this study, calcium carbide residue (CCR) was added to modify SCSM. Effects of CCR on the reaction kinetics, phase assemblage, and microstructure of SCSM were investigated, and promotion mechanisms of CCR on the early hydration of SCSM were discussed. Results showed that the OH⁻ released by CCR promoted the depolymerization of GBFS and improved the early exothermic rate. Meanwhile, the Ca²⁺ provided by CCR and GBFS reacted with CO₃²⁻ to form calcium carbonate, and promoted the formation of C-(A)-S-H with [SiO₄]^4- and [AlO₄]^5- released by GBFS. In addition, CCR provided additional nucleation sites to promote the hydration reaction. Through combined chemical and physical effects, CCR significantly shortened the induction period from 24 h to 0.8 h, drastically reduced the setting time from 688 min to 171 min. It increased the 1 d compressive and flexural strength from negligible values to 11.24 MPa and 4.31 MPa, respectively. Therefore, CCR as a high-quality modified material provides a scalable paradigm for developing high-performance and low-carbon SCSM.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106264"},"PeriodicalIF":13.1,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144719508","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}

{"title":"Carbon sequestration in cementitious composites containing two-step thermochemically activated biochar","authors":"Sahana C. M,&nbsp;Souradeep Gupta","doi":"10.1016/j.cemconcomp.2025.106255","DOIUrl":"10.1016/j.cemconcomp.2025.106255","url":null,"abstract":"<div><div>Biochar (BC) activation can induce structural changes, which may enhance CO₂ sequestration and the engineering performance of biochar-based cementitious materials. In this research, the effect of biochar engineered under two conditions – (i) thermal treatment (TTBC) at 550 °C, 650 °C, and 750 °C respectively, and (ii) KOH- activation (KBC) at the mentioned temperatures and BC: KOH of 1:2, 1:3, and 1:4, on the hydration kinetics, CO₂ sequestration, structural changes, strength and shrinkage of biochar-cement composites is examined. KBC has a high macro-pore (&gt;50 nm pores) volume and contains oxygenated groups, while TTBC is primarily aromatic and micro-porous (&lt;2 nm pores). High surface area (190–237 m²/g), structural disorder, and the presence of oxygen-rich functional groups in KBC activated at 750 °C accelerate the hydration kinetics and enhance the total hydration of cement pastes by 30–51 % compared to pastes with TTBC and KBC prepared at 550 °C and 650 °C. KOH activation promotes carbon burn-off and increases meso- and macro-porosity of biochar, thus creating additional diffusion channels for CO₂. This enhances the CO₂-sequestration of biochar-cement by 17–45 % compared to TTBC. CO₂ sequestration in biochar-cement increases with a change in BC: KOH from 1:2 to 1:4, reducing the small and medium capillary pore volume by 40–71 %. This enhances the 1-day strength by 16–37 % and longer-term strength (after 1 year) by 22–45 %. Further, enlarged portlandite crystals are formed due to residual potassium (from KOH activation), which mitigates the total shrinkage by 15–38 %, enhancing the stability of activated biochar-based cementitious materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106255"},"PeriodicalIF":13.1,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144719509","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}

{"title":"Enhancing interlayer bonding in 3-dimensional printed concrete using bacteria-based biomineralization","authors":"Amardeep Singh ,&nbsp;Kamal Anand ,&nbsp;Qiong Liu ,&nbsp;VivianW.Y. Tam ,&nbsp;Shweta Goyal ,&nbsp;M. Sudhakara Reddy","doi":"10.1016/j.cemconcomp.2025.106258","DOIUrl":"10.1016/j.cemconcomp.2025.106258","url":null,"abstract":"<div><div>Microbially induced calcium carbonate precipitation (MICCP) has demonstrated considerable promise in enhancing the mechanical properties and durability of 3D printed concrete (3DPC). This study aims to assess the on-site applicability of a ready-to-use, fly ash-based bacterial inoculum designed for industrial use, with the objective of enhancing interlayer cohesion while reducing environmental impact. A comprehensive testing regime was conducted, encompassing direct and splitting tensile tests, in conjunction with microstructural analyses, including Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FT-IR), 3D Digital Image Correlation (3D DIC), and Mercury Intrusion Porosimetry (MIP). The testing was conducted across two series of specimens. The findings indicate that the incorporation of nutrient broth (NB) supplemented with nutrients during the printing and curing process led to a substantial enhancement in mechanical performance. Specimens treated NB and cured NB-enriched water showed an increase in splitting tensile strength and direct tensile strength of 422.21 % in Series I and 509.25 % in Series II. Further analysis via SEM revealed the formation of lamellar rhombohedral calcite crystals (3–7 μm), and XRD confirmed greater calcite content in NB-treated specimens. TGA results indicated increased calcite formation, while MIP analysis revealed reduced porosity and more refined pore structures in treated specimens. These findings confirm the effectiveness of MICCP using a field-deployable bacterial solution, paving the way for scalable applications in sustainable 3D concrete printing. Future studies should investigate further optimization for field deployment and adaptation of bacterial strains to varying environmental conditions.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106258"},"PeriodicalIF":13.1,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710837","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}

{"title":"Mechanisms underlying the carbonation of Portland cement incorporating triethanolamine to enhance CO2 curing effectiveness","authors":"Jionghuang He ,&nbsp;Yingliang Zhao ,&nbsp;Kai Cui ,&nbsp;Zihan Ma ,&nbsp;Yong Tao ,&nbsp;Peiliang Shen ,&nbsp;Guangcheng Long ,&nbsp;Chi-Sun Poon","doi":"10.1016/j.cemconcomp.2025.106252","DOIUrl":"10.1016/j.cemconcomp.2025.106252","url":null,"abstract":"<div><div>This study comprehensively investigated the effects of triethanolamine (TEA) on cement carbonation, with a focus on carbonation kinetics, microstructure development, and underlying mechanisms. The results demonstrated that TEA retarded cement carbonation, with this effect intensifying as TEA concentration increased. This retardation primarily occurred because TEA promoted initial Ca²⁺ precipitation and accelerated pH reduction, converting absorbed CO₂ into HCO₃^-, which retarded subsequent CaCO₃ formation. Notably, higher TEA concentrations facilitated the carbonation of the aluminate phase, contributing to a two-stage carbonation mechanism, characterized by a distinctive double-peak feature in the heat evolution curve. TEA exhibited a CO₂ absorption capacity of 31.56 g/mol and was negligibly consumed during carbonation, suggesting that TEA behaved similarly to a catalyst, exerting a significant impact even in small quantities. Consequently, a more homogeneous and denser microstructure, along with enhanced strength development were achieved at a low TEA concentration. In contrast, high TEA concentrations significantly exacerbated the retardation and caused an uneven distribution of products within the matrix. These findings reveal the mechanisms through which TEA influences cement carbonation and underscore its potential to enhance CO₂ curing effectiveness.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106252"},"PeriodicalIF":13.1,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701761","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}

{"title":"Reconstruction kinetics and structural evolutions of chromate and chloride intercalated Mg/Al layered double hydroxide in low-carbon cements","authors":"Yuying Zhang ,&nbsp;Xiaohong Zhu ,&nbsp;Bin Ma ,&nbsp;Xinwei Li ,&nbsp;Weijian Xu ,&nbsp;Lei Wang ,&nbsp;Roya Maboudian ,&nbsp;Daniel C.W. Tsang","doi":"10.1016/j.cemconcomp.2025.106250","DOIUrl":"10.1016/j.cemconcomp.2025.106250","url":null,"abstract":"<div><div>Understanding the early-stage reconstruction of Mg/Al layered double hydroxide (LDH) is critical for enhancing anion immobilization in low-carbon cementitious systems. Here, we combined <em>in-situ</em> and <em>ex-situ</em> synchrotron X-ray diffraction analyses to reveal the time-dependent and reversible layered structure transformation of Mg/Al-LDH from calcined Mg/Al-LDH (CLDH) in cementitious environments enriched with Cr(VI) and Cl⁻. Our observations revealed that the initial interlayer space of Mg/Al-LDHs ranged from 7.64 to 7.74 Å, typical for OH⁻ intercalated LDHs, while Cr(VI) hindered the LDH reconstruction. Intercalation of Cl⁻ and Cr(VI) anions expanded the interlayer space of Mg/Al-LDHs up to 8.35 Å, yet had a negligible impact on the lamellar skeleton. Density functional theory calculations indicated that Cr(VI) had a stronger affinity for Mg/Al-LDH layers than Cl⁻, evidenced by higher charge transfer (+2.04 e <em>vs.</em> +0.79 e) and lower interlayer adsorption energy (−1.92 eV <em>vs.</em> −0.29 eV). By selecting Cr(VI) and Cl–, two coexisting anions in hazardous wastes with different charges and geometry, we gained a mechanistic understanding of how a broader group of oxyanions (e.g., SO₄²⁻, AsO₄³⁻) behave in LDH-containing low-carbon cements. Real-time observation and theoretical calculations unveiled the anion-driven reconstruction of Mg/Al-LDH in low-carbon cement, guiding the development of LDH-modified low-carbon cement for immobilizing harmful anions in aggressive environments. These findings facilitated the broader adoption of sustainable cementitious materials across various aggressive environments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106250"},"PeriodicalIF":13.1,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701762","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}

{"title":"Self-sensing performance of nanoengineered one-part alkali-activated materials-based sensors after exposure to elevated temperature","authors":"Yipu Guo ,&nbsp;Fulin Qu ,&nbsp;Wenkui Dong ,&nbsp;Yizhe Wang ,&nbsp;Doo-Yeol Yoo ,&nbsp;Ippei Maruyama ,&nbsp;Wengui Li","doi":"10.1016/j.cemconcomp.2025.106257","DOIUrl":"10.1016/j.cemconcomp.2025.106257","url":null,"abstract":"<div><div>One-part alkali-activated binders offer advantages such as low carbon footprint and enhanced thermal stability, making them a promising alternative to ordinary Portland cement for manufacturing self-sensing cementitious composites (SSCCs). This study aims to develop a nanocarbon black (NCB)-engineered one-part alkali-activated slag composite (CBAS) for a fire safety monitoring system, and thus the residual resistance-based and capacitance-based sensing performances after exposure to 300 °C and 600 °C were investigated. The results indicate the developed CBAS exhibits enhanced residual self-sensing capabilities and retains adequate mechanical strength after high-temperature exposure. The influence of elevated temperatures on the self-sensing mechanisms was thoroughly explored through analyses of phase evolution, microstructure, and the innovatively proposed paired equivalent circuit models of ((R(QR))(RQ)(RW)) and (QR). The exclusive presence of Maxwell–Wagner type interfacial polarization, resulting from NCB/matrix(microdefects)/NCB structures, ensures highly sensitive and improved capacitance-based responses after high-temperature exposure. The compressive and flexural strengths follow the same minor-then-severe strength loss pattern after exposure to 300 °C and 600 °C, with the retention rates of 48.3–93.1 % and 51.1–73.2 %, respectively. The sensitivity of DC and AC resistance-based sensing follows the same increasing–then–decreasing trend, with DC-based sensing exhibiting higher sensitivity. In contrast, capacitance-based sensing shows a monotonically increasing sensitivity with rising exposure temperature and the maximum FCC of 63.1–207.3 % under 6 MPa cyclic compression. The insights from equivalent circuit analysis align well with the theoretical polarization mechanism evolution observed in both resistance- and capacitance-sensing responses, demonstrating the accuracy and reliability of the proposed equivalent circuit model and mechanistic analysis.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"164 ","pages":"Article 106257"},"PeriodicalIF":13.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701789","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}