Cement & concrete composites最新文献_第3页

Layer interface in 3D printed cement-based materials: Heterogeneous phase distribution and new insights into formation mechanism 3D打印水泥基材料的层界面：非均相分布和形成机制的新见解

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-17 DOI: 10.1016/j.cemconcomp.2025.106337

Yi Zhang , Qiang Ren , Kim Van Tittelboom , Geert De Schutter , Zhengwu Jiang

{"title":"Layer interface in 3D printed cement-based materials: Heterogeneous phase distribution and new insights into formation mechanism","authors":"Yi Zhang , Qiang Ren , Kim Van Tittelboom , Geert De Schutter , Zhengwu Jiang","doi":"10.1016/j.cemconcomp.2025.106337","DOIUrl":"10.1016/j.cemconcomp.2025.106337","url":null,"abstract":"<div><div>An in-depth understanding of the formation mechanism of layer interfaces is crucial to improving interface quality and advancing the application of extrusion-based 3D printed cement-based materials (3DPCM). Here, a multi-scale analysis of phase distribution at layer interfaces of 3DPCM containing silica fume (SF) and ultrafine fly ash (UFA) have been conducted, and new insights into the formation mechanism of the layer interface were provided. The interface, as observed via scanning electron microscopy coupled with energy dispersive spectroscopy, is notably more porous than the matrix and shows both a deficiency in aggregate and an enrichment in calcium hydroxide (CH). The concentrated pores and moisture at the interface provide sufficient conditions for the growth of CH. Wall effect of particle accumulation causes aggregates to move away from the interface, while the material deformation and the aggregate settlement during printing lead to aggregate redistribution. As the printing height increases, the heterogeneous distribution of aggregates and pores becomes more pronounced. CH enrichment is enhanced with longer time intervals. Due to the improved deformation resistance and water retention, SF promotes a more homogeneous phase distribution at the interface, hence reducing variations in interlayer bond strength across different printing heights and time intervals. UFA has a limited impact on materials’ deformation resistance but contributes to the reversible structural build-up. This helps to mitigate the discrepancy in phase distribution between matrix and interface with increasing time intervals, hence reducing the dependence of interlayer bond strength on time intervals.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106337"},"PeriodicalIF":13.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077629","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

Integral superhydrophobicity in cement matrix via in-situ hierarchical micro-nano roughness 原位分层微纳粗糙度对水泥基体整体超疏水性的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-17 DOI: 10.1016/j.cemconcomp.2025.106335

Shengqian Ruan , Xudong Zhao , Kangning Liu , Jian-Xin Lu , Juhyuk Moon , Chi Sun Poon

{"title":"Integral superhydrophobicity in cement matrix via in-situ hierarchical micro-nano roughness","authors":"Shengqian Ruan , Xudong Zhao , Kangning Liu , Jian-Xin Lu , Juhyuk Moon , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106335","DOIUrl":"10.1016/j.cemconcomp.2025.106335","url":null,"abstract":"<div><div>Creating hierarchical matrix roughness from micron to nano scales remains a tough challenge for developing integral superhydrophobic cement-based materials. This study presents a novel approach employing calcium sulfoaluminate (CSA) cement, selected for its intrinsic capacity to generate hybrid crystalline–amorphous hydration products and multiscale porosity, to construct a three-level bulk roughness structure: micron (5–50 μm), submicron (100 nm–5 μm), and nano (5–100 nm). The origins of the hierarchical roughness and its underlying mechanism on enhancing hydrophobicity were investigated in comparison with an ordinary Portland cement system. The results indicate that the CSA matrix comprised 19.8–22.1 vol% un-hydrated clinkers, 75.2–76.8 vol% hydration products, and pores. This specific phase distribution with broad microhardness ranges endowed the micron-scale roughness. Gel clusters, prismatic ettringite (AFt, 28.6–30.0 wt%), fuzzy aluminum hydroxide (AH<sub>3</sub>) and C–S–H gels (38.5–40.8 wt%), and meso/nano pores (24.3–28.4 vol%), formed irregular, pervasive 3D textures contributing to the submicron and nano-scale roughness. Additionally, multilayered flower-like phases, considered as silane–Ca<sup>2+</sup>–CSA hybrids, were extensively formed in the superhydrophobic matrix, providing low–surface–energy components and additional submicron-scale roughness. The synergy between this intrinsic hierarchical texture and 1 % silane modification achieved a water contact angle of 159.1° and an 88.8 % reduction in water sorptivity, offering a distinctive design strategy for superhydrophobic, durable CSA-based materials applicable to coatings, repair materials, and 3D-printed components.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106335"},"PeriodicalIF":13.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145077471","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

Saddle stitching-enabled interfacial toughening in 3D printed concrete 在3D打印混凝土中，鞍座缝合使界面增韧

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-17 DOI: 10.1016/j.cemconcomp.2025.106336

Rijiao Yang , Chengji Xu , Xiufei You , Xinze Li , Hao Xue , Yu Peng , Qiang Zeng , Zhendi Wang

{"title":"Saddle stitching-enabled interfacial toughening in 3D printed concrete","authors":"Rijiao Yang , Chengji Xu , Xiufei You , Xinze Li , Hao Xue , Yu Peng , Qiang Zeng , Zhendi Wang","doi":"10.1016/j.cemconcomp.2025.106336","DOIUrl":"10.1016/j.cemconcomp.2025.106336","url":null,"abstract":"<div><div>Reinforcement implantation in concrete 3D printing is always a challenging task. Herein, a saddle stitching reinforcement (SSR) was developed to reinforce 3D printed concrete (3DPC). Compression and splitting tests were conducted to evaluate the mechanical properties of SSR-3DPC with anisotropy assessment; digital image correlation (DIC) analysis was integrated to track the failure process and mode; and X-ray computed tomography (XCT) was employed to characterize the interfacial microstructure of stitched 3DPC specimens.Results demonstrate that the proposed saddle stitching technique effectively mitigates the splitting strength anisotropy, and enhances the slipping strength, ductility, and absorption energy through the combined action of stitch legs and crotch reinforcement. However, a weaker stitch-matrix interface forms due to the inadequate self-recovery of 3DPC slurries after implantation. These findings deepen the understanding of reinforcement implantation in viscous concrete slurries, and provide valuable insights for optimizing reinforcement strategies in concrete 3D printing.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106336"},"PeriodicalIF":13.1,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145072132","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

Preparation of performance-enhanced alkali-activated slag using a plant-derived chelator 利用植物源螯合剂制备增强型碱活性矿渣

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-11 DOI: 10.1016/j.cemconcomp.2025.106332

Weibo Tan , Peiyuan Chen , Yonghui Wang , Peng Qian , Zeren Chen , Jialai Wang

{"title":"Preparation of performance-enhanced alkali-activated slag using a plant-derived chelator","authors":"Weibo Tan , Peiyuan Chen , Yonghui Wang , Peng Qian , Zeren Chen , Jialai Wang","doi":"10.1016/j.cemconcomp.2025.106332","DOIUrl":"10.1016/j.cemconcomp.2025.106332","url":null,"abstract":"<div><div>This study aims to investigate the effects of tannic acid (TA) as a plant-derived chelator on the performance of alkali-activated slag (AAS). The influence of different dosages of TA (0.1 %, 0.2 %, 0.3 %, and 0.5 %) on rheological behavior, setting time, hydration evolution, hydration products, ion concentration, pore structure, elastic modulus, compressive strength and shrinkage character of AAS mortar was analyzed. The results indicate that, due to the particle adsorption and Ca<sup>2+</sup> complexation abilities of TA, it can significantly and multi-dimensionally enhance the performance of AAS. As the content of TA increases, the setting time of AAS is prolonged by 125–820 min, while the flowability grows by 8–43.9 %. Most importantly, TA reduced the 28d autogenous shrinkage of AAS mortar by 21.3–54.5 % while significantly increasing the compressive strength by 25.4–46.1 %, highlighting the effectiveness of TA as an additive for AAS. Compared to commercial additives, TA is economical, efficient, and offers significant ecological benefits. The results contribute to the decarbonization of AAS admixture and the development of specialized admixture for AAS.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106332"},"PeriodicalIF":13.1,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043041","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

Fiber-matrix interface enhancement in engineered geopolymer composites using cellulose nanofibers based on in-situ polymerization 基于原位聚合的纤维素纳米纤维增强工程地聚合物复合材料的纤维-基质界面

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-11 DOI: 10.1016/j.cemconcomp.2025.106331

Sifan Zhang , Qiao Wang , Wei Zhou , Qiaomu Zheng , Qingliang Yu , Xiaolin Chang , Xinqiang Niu

{"title":"Fiber-matrix interface enhancement in engineered geopolymer composites using cellulose nanofibers based on in-situ polymerization","authors":"Sifan Zhang , Qiao Wang , Wei Zhou , Qiaomu Zheng , Qingliang Yu , Xiaolin Chang , Xinqiang Niu","doi":"10.1016/j.cemconcomp.2025.106331","DOIUrl":"10.1016/j.cemconcomp.2025.106331","url":null,"abstract":"<div><div>This paper studied self-assembled cellulose nanofibers (SCNF) with in-situ polymerization potential, aiming to enhance the fiber-matrix interface bonding of engineered geopolymer composites (EGC). The freeze-thawing method was used to introduce cellulose oligomers into the alkaline solution, ensuring the simultaneous occurrence of SCNF self-assembly and geopolymerization during curing. This process facilitated the formation of interpenetrating organic-inorganic networks within EGC. Microstructural characterization confirmed that SCNF improved the fiber-matrix interface through physical bridging and chemical bonding. Single fiber pullout test showed that SCNF increased the frictional bond by 18.6 % and the chemical bonding energy by 657 %, while reducing the slip-hardening coefficient <em>β</em> by 68.6 %. The results revealed a two-fold effect of SCNF: the interface bonding was strengthened but the slip-hardening behavior of PVA fibers was suppressed. Additionally, compressive and uniaxial tensile tests were conducted to evaluate the modification effect of SCNF on the mechanical properties of EGC. The optimal SCNF content was determined to be 0.5 wt%, which improved the compressive strength, tensile strength, strain capacity, and energy absorption of the EGC by 46.3 %, 44.2 %, 32.6 %, and 93.1 %, respectively. These findings provide direct and quantitative support for developing high-performance geopolymer composites.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106331"},"PeriodicalIF":13.1,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043209","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

CO2 mineralization mechanism of chlorellestadite: Impact on strength development 小球藻CO2矿化机制：对强度发育的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-10 DOI: 10.1016/j.cemconcomp.2025.106330

Mohamed Abdelrahman , Vikram Kumar , Hyeonseok Jee, Nishant Garg

{"title":"CO2 mineralization mechanism of chlorellestadite: Impact on strength development","authors":"Mohamed Abdelrahman , Vikram Kumar , Hyeonseok Jee, Nishant Garg","doi":"10.1016/j.cemconcomp.2025.106330","DOIUrl":"10.1016/j.cemconcomp.2025.106330","url":null,"abstract":"<div><div>Chlorellestadite (Ca<sub>10</sub>(SiO<sub>4</sub>)<sub>3</sub>(SO<sub>4</sub>)<sub>3</sub>Cl<sub>2</sub>) is the primary phase formed after the thermal treatment of waste-to-energy (WTE) ashes and is also present in eco-cements produced from WTE ashes. CO<sub>2</sub> curing of such systems is known to facilitate strength development. However, the precise carbonation reaction mechanism of chlorellestadite is not well understood. Here, by conducting a systematic investigation on high-purity, synthetic chlorellestadite samples, we suggest a new reaction mechanism and propose Pathways for beneficial use. Specifically, the carbonation mechanism involves 3 parallel reactions (R1-R3) wherein, R1 involves carbonation of chlorellestadite, R2 involves carbonation of calcium chlorosilicate (Ca<sub>3</sub>SiO<sub>4</sub>Cl<sub>2</sub>), and R3 involves carbonation of sinjarite (CaCl<sub>2</sub>.2H<sub>2</sub>O) – all together leading to 29.7 % of CO<sub>2</sub> uptake. Given this CO<sub>2</sub> uptake potential, we find that cement blended with 20 % chlorellestadite can be subject to simultaneous hydration and carbonation, forming binders with enhanced strength and a lower CO<sub>2</sub> footprint. These findings elucidate Pathways for utilizing a relatively inexpensive source of calcium.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106330"},"PeriodicalIF":13.1,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043791","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

Study on bonding quality of cement-casing interfacial transition zone based on acoustic impedance testing: Influence of microstructural characteristics 基于声阻抗测试的水泥-套管界面过渡区粘接质量研究：微观结构特征的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-09 DOI: 10.1016/j.cemconcomp.2025.106329

Yuhao Wen , Haizhi Zhang , Linsong Liu , Zhenyu Tao , Huiting Liu , Renzhou Meng , Yi Hao , Zhengrong Zhang , Ziyue Wang

{"title":"Study on bonding quality of cement-casing interfacial transition zone based on acoustic impedance testing: Influence of microstructural characteristics","authors":"Yuhao Wen , Haizhi Zhang , Linsong Liu , Zhenyu Tao , Huiting Liu , Renzhou Meng , Yi Hao , Zhengrong Zhang , Ziyue Wang","doi":"10.1016/j.cemconcomp.2025.106329","DOIUrl":"10.1016/j.cemconcomp.2025.106329","url":null,"abstract":"<div><div>The cementing quality of shallow oil and gas wells plays a pivotal role in ensuring wellbore sealing integrity. A comprehensive understanding of the interfacial transition zone (ITZ) between cement sheath and casing, as well as its bonding characteristics, is therefore of significant engineering relevance for enhancing shallow-well cementing performance. In this study, the degree of interfacial bonding was quantitatively characterized through acoustic impedance measurements, while the bonding mechanisms at the cement–casing interface were elucidated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and backscattered electron energy-dispersive spectroscopy (BSE-EDS). A refined methodology was proposed for the microstructural analysis of ITZ, and the intrinsic relationship between ITZ microphase assemblage and bonding performance was established. The results reveal that the elevated free water content at the cement–casing interface leads to the accumulation of unhydrated cement clinkers within the ITZ, resulting in a porous microstructure that weakens interfacial bonding. Enhancing the degree of hydration within the ITZ and regulating the deformation characteristics of the hardened cement paste were found to be effective in improving interfacial bonding. Notably, the gel-phase content exerts a more pronounced influence on bonding strength than volumetric deformation. Specifically, an inverse correlation was observed between gel-phase content and ITZ thickness. When the gel-phase fraction increases, the ITZ thickness decreases to the range of 10–30 μm, within which the interface exhibits optimal bonding performance.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106329"},"PeriodicalIF":13.1,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043042","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

Geologically-inspired calcium carbonate-based sustainable cementitious materials 受地质启发的碳酸钙基可持续胶凝材料

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-09 DOI: 10.1016/j.cemconcomp.2025.106328

Jinzewei Nie , Wei Wang , Yamei Zhang , Zedi Zhang , Takafumi Noguchi , Ippei Maruyama

{"title":"Geologically-inspired calcium carbonate-based sustainable cementitious materials","authors":"Jinzewei Nie , Wei Wang , Yamei Zhang , Zedi Zhang , Takafumi Noguchi , Ippei Maruyama","doi":"10.1016/j.cemconcomp.2025.106328","DOIUrl":"10.1016/j.cemconcomp.2025.106328","url":null,"abstract":"<div><div>During geological diagenesis, calcium carbonate (<em>Cc</em>) particles can aggregate and solidify into dense continuous structures. Inspired by this natural process, this study proposes a new low-carbon cementitious system, <em>Cc</em> cementitious materials, and aims to produce dense <em>Cc</em> pastes within timescales comparable to those of conventional manufacturing processes. To accurately clarify the mechanism behind, high-purity <em>Cc</em> polymorphs (amorphous calcium carbonate (ACC), vaterite, aragonite, and calcite) were used. Results show that the densification behaviour of <em>Cc</em> polymorphs was influenced by the particle rearrangement capability, dissolution–precipitation characteristics, and precipitated crystal morphologies. Among those polymorphs, the paste made from ACC exhibited excellent early-age mechanical properties and could obtain a compressive strength of 23 MPa with a mild cold-sintering process. The findings suggest the potential of <em>Cc</em> as a binder in cold-sintered construction materials, thus providing insights for developing a low or even negative carbon <em>Cc</em>-based concrete from calcium-rich solid wastes and atmospheric carbon dioxide.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106328"},"PeriodicalIF":13.1,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145017757","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

Insights into improved chloride resistance of carbon steel in Portland cement blended with belitic calcium sulfoaluminate cement 钙硫铝酸钙硅酸盐水泥中碳钢抗氯离子性能的提高

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-08 DOI: 10.1016/j.cemconcomp.2025.106327

Zhi Geng, Xinhao Bi, Jinjie Shi

{"title":"Insights into improved chloride resistance of carbon steel in Portland cement blended with belitic calcium sulfoaluminate cement","authors":"Zhi Geng, Xinhao Bi, Jinjie Shi","doi":"10.1016/j.cemconcomp.2025.106327","DOIUrl":"10.1016/j.cemconcomp.2025.106327","url":null,"abstract":"<div><div>While extensive evidence demonstrates that blending belitic calcium sulfoaluminate (BCSA) cement with ordinary Portland cement (OPC) can effectively passivate carbon steel, its corrosion resistance under chloride exposure remains insufficiently investigated. In this study, chloride-induced corrosion behavior of carbon steel embedded in mortars was systematically investigated, taking into account several critical factors such as pore solution chemistry, pore structure, hydration products and the steel-mortar interface. Additionally, red mud (RM) was incorporated into the OPC-BCSA blend to evaluate the corrosion resistance of steel in the modified cementitious system under chloride exposure. The results indicate that the alkalinity of pore solutions plays a decisive role in pitting corrosion resistance, despite the varying passivation properties of passive films formed in simulated pore solutions. However, although OPC mortar exhibits high alkalinity and strong chemical chloride binding capacity, the more compact steel-mortar interface in the OPC-BCSA and OPC-BCSA-RM blended mortars serves as effective physical barriers against chloride ingress and significantly suppresses the propagation of corrosion pits. The results of this study are beneficial for the application of low-carbon binders in concrete structures subjected to marine environments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106327"},"PeriodicalIF":13.1,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145017521","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

Image segmentation-based quantification of phase distribution in coarse aggregate ultra-high performance concrete and its impact on mechanical properties 基于图像分割的粗集料超高性能混凝土相分布量化及其对力学性能的影响

IF 13.1 1区工程技术

Cement & concrete composites Pub Date : 2025-09-08 DOI: 10.1016/j.cemconcomp.2025.106326

Lianlian Xie , Bihua Zhou , Yiming Yao , Qizhi Xu , Rui Zhong , Hongyu Zhou , Jingquan Wang

{"title":"Image segmentation-based quantification of phase distribution in coarse aggregate ultra-high performance concrete and its impact on mechanical properties","authors":"Lianlian Xie , Bihua Zhou , Yiming Yao , Qizhi Xu , Rui Zhong , Hongyu Zhou , Jingquan Wang","doi":"10.1016/j.cemconcomp.2025.106326","DOIUrl":"10.1016/j.cemconcomp.2025.106326","url":null,"abstract":"<div><div>This study investigates the mechanical performance and phase distribution characteristics of coarse aggregate ultra-high performance concrete (CA-UHPC) using vertically cast specimens (100 mm × 400 mm × 1000 mm). A series of mixes with varying coarse aggregate (CA) and steel fiber contents were designed to analyze their effects on vertical distribution, compressive and flexural properties. Advanced image recognition techniques—including a hybrid ResNet50+U-Net deep learning model with cross-attention mechanisms—were developed to quantify CA distribution, while morphology-based image processing was used to evaluate steel fiber dispersion. Results showed significant downward migration of both CA and steel fiber during casting, leading to mechanical property gradients along specimen height. The maximum differences in compressive and flexural strength reached 52.53 MPa and 16.77 MPa, respectively. Specimens with 17 % CA and 2.5 % steel fiber exhibited relatively uniform internal distribution and favorable mechanical performance, suggesting a synergistic interaction between the CA-induced skeletal framework and the fiber bridging mechanism. In contrast, excessive CA content (30 %) led to fiber clustering and reduced ductility, while insufficient fiber dosage resulted in brittle failure. These findings offer a novel perspective for evaluating material homogeneity and may inform future mix design strategies for CA-UHPC in large-scale structural applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"165 ","pages":"Article 106326"},"PeriodicalIF":13.1,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145009498","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