Cement & concrete composites最新文献

Experimental characterization and constitutive modelling of the anisotropic dynamic compressive behavior of 3D printed engineered cementitious composites

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-08 DOI: 10.1016/j.cemconcomp.2025.105995

Meng Chen , Jianhua Cheng , Tong Zhang , Yuting Wang

{"title":"Experimental characterization and constitutive modelling of the anisotropic dynamic compressive behavior of 3D printed engineered cementitious composites","authors":"Meng Chen , Jianhua Cheng , Tong Zhang , Yuting Wang","doi":"10.1016/j.cemconcomp.2025.105995","DOIUrl":"10.1016/j.cemconcomp.2025.105995","url":null,"abstract":"<div><div>Engineered cementitious composites (ECC) offer a potential solution to the weak tensile strength and cracking issues of 3D printed concrete (3DPC), while their great performance under dynamic loading helps to broaden the application scope of 3D printing technology. This study systematically investigates the relationship between the dynamic compressive properties and the anisotropic behavior of 3DP-ECC under various strain rates through ultrasonic pulse velocity, quasi-static and dynamic compression, as well as novel sieving tests. The results indicate that the dynamic compressive behavior of 3DP-ECC shows a pronounced strain rate dependency especially in the Z-direction, while the mechanical anisotropy coefficient of the 3DP specimens decreased by 14.2% as the strain rate rose from 60 s<sup>−1</sup> to 120 s<sup>−1</sup>. In what follows, the fractal theory is applied to characterize the internal damage of 3DP-ECC in different orientations, indicating that the dynamic compressive strength and dissipation energy exhibit a linear relationship with the fractal dimension. Based on the modified viscoelastic theory and spatial transformation tensor method, the anisotropic damage dynamic compression constitutive model is developed to predict the stress-strain behavior of 3DP-ECC at different strain rates. The exploration of dynamic compression behavior and anisotropic constitutive relationships of 3DP-ECC provides a basis for further integrated practical applications under extreme strain rate conditions.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 105995"},"PeriodicalIF":10.8,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143576160","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

Thermodynamic effects of chloride's type and dosage on phase composition of magnesium oxysulfate cement and its impact on macro-properties

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-07 DOI: 10.1016/j.cemconcomp.2025.106032

Tong Li , Yuhao Zheng , Huisu Chen , Tingting Zhang , Rongling Zhang

{"title":"Thermodynamic effects of chloride's type and dosage on phase composition of magnesium oxysulfate cement and its impact on macro-properties","authors":"Tong Li , Yuhao Zheng , Huisu Chen , Tingting Zhang , Rongling Zhang","doi":"10.1016/j.cemconcomp.2025.106032","DOIUrl":"10.1016/j.cemconcomp.2025.106032","url":null,"abstract":"<div><div>As magnesium oxysulfate cement (MOS) finds more applications in salt lakes and marine environments, the interaction between Cl<sup>−</sup> and MOS has gained more attention. Nevertheless, a scarcity of previous studies has investigated the effects of chloride type and dosage on the phase composition of hardened MOS paste. This study creates a newly extended and internally consistent thermodynamic database to systematically explore the impacts of four chloride salts (NaCl, KCl, MgCl<sub>2</sub>, and CaCl<sub>2</sub>) on the phase assemblage of MOS at various chloride dosages, including chloride impurities (0–0.125 g/(100g MOS)), chloride attack (0–0.25 mol/(100g MOS)), and high-volume MgCl<sub>2</sub> (>0.05 mol/(100g MOS)). The predicted phase assemblages via thermodynamic modeling are validated using the experimental phase assemblages characterized by XRD from both the literature and our experiments. The gel-space ratio is used to bridge the relationship between phase composition and the compressive strength of samples. The feasibility of this correlation is confirmed by compressive strength from both the literature and our experiments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106032"},"PeriodicalIF":10.8,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143569514","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

Recognition of the free slump in dry concrete mix: A 3D-digital image correlation test and the spatiotemporal variability

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-06 DOI: 10.1016/j.cemconcomp.2025.106012

Yangyi Zhang, Xueshi Liu, Jianyun Wang, Yun Gao

{"title":"Recognition of the free slump in dry concrete mix: A 3D-digital image correlation test and the spatiotemporal variability","authors":"Yangyi Zhang, Xueshi Liu, Jianyun Wang, Yun Gao","doi":"10.1016/j.cemconcomp.2025.106012","DOIUrl":"10.1016/j.cemconcomp.2025.106012","url":null,"abstract":"<div><div>Dry concrete mix has advantages of high construction efficiency and rapid early strength development. It has been employed extensively in a variety of sectors, including construction and pavement engineering. Traditional methods assessing its workability such as the Vebe test are susceptible to human error, which usually leads to the lack of the satisfactory accuracy in practice. To address the limitations of traditional methods, this study develops a three-dimensional digital image correlation (3D-DIC) method to meticulously recognize the free slump in dry concrete mix. Owing to the prominent advances in high precision and full-field measurement, the 3D-DIC method enables a novel monitoring and visualization of the free slump in terms of the spatiotemporal variability, i.e., the temporal evolution and the spatial variability. It is meanwhile possible to elucidate the spatiotemporal variability through two statistical models such as the Gaussian model and the semi variogram exponential model. Consequently, the 3D-DIC method presents two synergistic parameters of high accuracy other than a single one of low accuracy as used in traditional methods to quantify the free slump in dry concrete mix, which correspond respectively to the consistency and cohesiveness of the workability.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106012"},"PeriodicalIF":10.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560824","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

Comparison of thermal and mechanochemical activation for enhancing pozzolanic reactivity of illite-rich shale

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-06 DOI: 10.1016/j.cemconcomp.2025.106034

Pengfei Zhao , Alexander Ozersky , Alexander Khomyakov , Karl Peterson

{"title":"Comparison of thermal and mechanochemical activation for enhancing pozzolanic reactivity of illite-rich shale","authors":"Pengfei Zhao , Alexander Ozersky , Alexander Khomyakov , Karl Peterson","doi":"10.1016/j.cemconcomp.2025.106034","DOIUrl":"10.1016/j.cemconcomp.2025.106034","url":null,"abstract":"<div><div>To address the challenges associated with urban construction waste disposal and promote sustainable construction practices, this study investigates the feasibility of repurposing an illite-rich waste shale as a supplementary cementitious material (SCM) through thermal and mechanochemical activation. The aim of this study is to develop a deeper understanding of the relationship between the chemical reactivity of activated shales and the performance of blended cement mortars. Various properties, including phase transitions, particle size distribution, surface morphology, chemical reactivity, as well as mortar fresh properties and compressive strength, were analyzed for the activated shales. The results show that the mechanochemically activated shale exhibited a noticeable increase in pozzolanic reactivity compared to the calcined shale. The mechanochemically activated shale also displayed a more granular surface morphology, which is beneficial for early-age reactivity. A bimodal particle size distribution was observed in the mechanochemically activated shale, likely attributed to the agglomeration of amorphized fine particles. Furthermore, the mechanochemically activated shale had a less negative impact on workability, primarily due to the re-adsorbed surface moisture, which offset the increased water demand in the blended cements. At 20 %, 30 %, and 40 % cement substitution levels, the mechanochemically activated shale mortar mixtures developed compressive strengths comparable to those of the control mixture at both 7 and 28 days. More importantly, the practical significance of this study lies in the successful activation of the illite-rich shale using an attrition mill for the first time, an industrially-scalable milling technology.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106034"},"PeriodicalIF":10.8,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143560827","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

Enhancing photocatalytic durability of high strength pervious concrete: Micro-mechanical and microscopic mechanisms

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-05 DOI: 10.1016/j.cemconcomp.2025.106020

Xunli Jiang , Jian-Xin Lu , Xue Luo , Zhen Leng , Chi Sun Poon

{"title":"Enhancing photocatalytic durability of high strength pervious concrete: Micro-mechanical and microscopic mechanisms","authors":"Xunli Jiang , Jian-Xin Lu , Xue Luo , Zhen Leng , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.106020","DOIUrl":"10.1016/j.cemconcomp.2025.106020","url":null,"abstract":"<div><div>Nano titanium dioxide (nano-TiO<sub>2</sub>) has been widely used in cement materials to remove nitrogen monoxide (NO), yet the durability of the applied nano-TiO<sub>2</sub> in the cementitious matrix remains a substantial challenge. This study developed a high-strength photocatalytic pervious concrete (HSPPC), and employed a low-pressure cold spraying method to apply the nano-TiO<sub>2</sub> to its surface, aiming to enhance the durability of the photocatalytic coating through synergistic optimization of both the materials and spraying process. The effects of the amount of nano-TiO<sub>2</sub>, spraying methods, and the aggregate-to-binder ratio (A/B) of the previous concrete on NO<sub>x</sub> degradation were determined. Additionally, the interface mechanics and durability enhancement mechanisms of photocatalytic coatings on the HSPPC were revealed through microscale mechanical and microscopic mechanism analyses. The results indicated that the efficiency of NO removal was increased with the increase in the amount of nano-TiO<sub>2</sub>, and A/B ratio. Compared to ordinary pervious concrete, the resistance to seepage scouring and vehicle tire abrasion of HSPPC was significantly improved. Moreover, the combination of HSPPC and the cold spraying method resulted in an efficient synergistic effect, considerably enhancing the durability of the nano-TiO<sub>2</sub> compared to traditional brushing methods. Micromechanical and microstructural analyses revealed that the mesoscopic pore structure formed within the cold-sprayed coating facilitated the formation of hydration products on the HSPPC substrate. This led to the generation of higher polymerization degree of C-S-H gels, which bonded the nano-TiO<sub>2</sub> particles together and enhanced the interfacial bonding with the substrate, effectively improving the cohesion, adhesion, and photocatalytic durability of the nano-TiO<sub>2</sub> coatings.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106020"},"PeriodicalIF":10.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143546527","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 behavior of reinforced UHPC: Effects of autogenous shrinkage and model of tensile capacity via deep learning-based symbolic regression

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-04 DOI: 10.1016/j.cemconcomp.2025.106019

Lei Tu , Hua Zhao , Chengjun Tan , Junde Hu , Jingqi Cao , Suiwen Wu

{"title":"Tensile behavior of reinforced UHPC: Effects of autogenous shrinkage and model of tensile capacity via deep learning-based symbolic regression","authors":"Lei Tu , Hua Zhao , Chengjun Tan , Junde Hu , Jingqi Cao , Suiwen Wu","doi":"10.1016/j.cemconcomp.2025.106019","DOIUrl":"10.1016/j.cemconcomp.2025.106019","url":null,"abstract":"<div><div>The tensile capacity of reinforced ultra-high performance concrete (R-UHPC) consists of two components: the tensile resistance of steel rebar and the contribution of UHPC. Although previous experimental studies have elucidated the total tensile capacity of R-UHPC, the individual contributions of UHPC and steel rebar remain unclear. Moreover, there is limited research on the influence of autogenous shrinkage on the tensile performance of R-UHPC. Therefore, this study aims to establish a model that accurately quantifies the contributions of both components and investigates the effect of autogenous shrinkage on the tensile behavior of R-UHPC. Direct tensile tests were conducted on both reinforced conventional UHPC (R-CUHPC) and reinforced low-shrinkage UHPC (R-LUHPC) specimens (with the addition of expansive agent and shrinkage-reducing agent) at reinforcement ratios of 1.7 %, 3.0 %, and 6.8 %, respectively. The results indicated that, as the reinforcement ratio increased, the first-cracking strength of R-LUHPC specimens exhibited slight fluctuations, whereas it notably decreased in R-CUHPC specimens. Additionally, autogenous shrinkage had minimal impact on the tensile capacity of R-LUHPC specimens. To tackle the challenge of quantifying the individual contributions of UHPC and steel rebar from experimental data, a deep learning-based symbolic regression method was introduced. As a result, a highly accurate model was developed to calculate the tensile capacity of R-UHPC components, incorporating 1.157 times the steel rebar's yield strength and 0.669 times the UHPC's ultimate tensile strength. Furthermore, this model reflects the load-bearing mechanism in which the steel rebar enters strain-hardening, while the contribution of UHPC does not reach its ultimate tensile strength due to the pull-out of partial steel fibers.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106019"},"PeriodicalIF":10.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538894","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

Mechanical properties and its prediction of sulphoaluminate cement-engineered cementitious composites (SAC-ECC) as rapid repair materials applied in winter construction

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-04 DOI: 10.1016/j.cemconcomp.2025.106016

Huayang Sun , Yanlin Huo , Zhichao Xu , Zhitao Chen , Yingzi Yang

{"title":"Mechanical properties and its prediction of sulphoaluminate cement-engineered cementitious composites (SAC-ECC) as rapid repair materials applied in winter construction","authors":"Huayang Sun , Yanlin Huo , Zhichao Xu , Zhitao Chen , Yingzi Yang","doi":"10.1016/j.cemconcomp.2025.106016","DOIUrl":"10.1016/j.cemconcomp.2025.106016","url":null,"abstract":"<div><div>Engineered cementitious composites (ECC) are recognized as effective repair materials. However, Ordinary Portland Cement (OPC)-ECC struggles to meet the demands of emergency repair and construction in cold regions, where rapid strength development is crucial. This paper focuses on the mechanical properties and its prediction model of sulphoaluminate cement (SAC)-ECC under low-temperature curing conditions. The effects of pre-curing times (0.75 h, 1.5 h, 3 h) and curing temperatures (20 °C, 0 °C, −5 °C, −10 °C) on the mechanical properties of ECC were investigated during the early and later stages of low-temperature curing. The results reveal that the compressive and tensile strengths of SAC-ECC decrease significantly with lower curing temperatures and shorter pre-curing times. However, the tensile strain capacity increases under these conditions. Notably, after pre-curing at 20 °C for 3 h followed by curing at −10 °C, the compressive strength reached 30 MPa at 4 h, and the tensile strain capacity exceeded 10 % after 1 day. A physical model based on micromechanical parameters obtained from fracture toughness tests and single-fiber pullout tests was developed, which could simulate and forecast the evolution of tensile properties in SAC-ECC under various curing regimes and ages. The predicted outcomes align well with the experimental results, offering valuable insights for guiding engineering applications in low-temperature environments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106016"},"PeriodicalIF":10.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538821","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

Exploring the curing regimes for nonhydraulic-hydraulic cementitious material composite binder: Study on the hemihydrate phosphogypsum-ground granulated blast-furnace slag system

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-03 DOI: 10.1016/j.cemconcomp.2025.106018

Zihao Jin, Chuanyu Gong, Xingyang He, Ying Su, Yingbin Wang, Yubo Li, Huahui Qi, Cong Tian

{"title":"Exploring the curing regimes for nonhydraulic-hydraulic cementitious material composite binder: Study on the hemihydrate phosphogypsum-ground granulated blast-furnace slag system","authors":"Zihao Jin, Chuanyu Gong, Xingyang He, Ying Su, Yingbin Wang, Yubo Li, Huahui Qi, Cong Tian","doi":"10.1016/j.cemconcomp.2025.106018","DOIUrl":"10.1016/j.cemconcomp.2025.106018","url":null,"abstract":"<div><div>Beta-hemihydrate phosphogypsum (β-HPG) as a nonhydraulic cementitious material has been extensively utilized to prepare low-carbon building materials. Ground granulated blast-furnace slag (GGBS) shows prospect performance in the modification of β-HPG. However, the strength development of GGBS requires high humidity which is harmful to gypsum-based materials. The influence of various curing regimes on the mechanical strength and microstructure of the β-HPG-GGBS composite binder was studied. Wet curing for 7 d and then dry curing for 21 d (W7d/D21d) proved the best curing conditions. The results show that W7d/D21d has a compressive strength of 22.15 MPa, which is 80 % more than that of dry curing for 28 days (D28d). In addition, the curing condition of W7d/D21d was proved to reduce the pore size and total porosity of the hardened paste, and the large damaged pores of W7d/D21d were decreased by 30 % compared with D28d. This indicates that proper wet curing provides sufficient water for the hardened paste and promotes the hydration degree of the composite binder, improving its mechanical properties. Specifically, the ettringite (AFt) formation of W7d/D21d is 3 times more than that of D28d, resulting in a more compact microstructure. It can be found that the pore structure parameters, compressive strength, total porosity, and fractal dimension of the hardened paste have a high exponential correlation. This paper provides an effective method for using gypsum-based composite binders incorporating hydraulic cementitious materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106018"},"PeriodicalIF":10.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538819","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

The compatibility of highly carboxylated polycarboxylate superplasticizer with sodium gluconate retarder in alkali-activated slag system 碱活性渣体系中高羧酸聚羧酸盐超塑化剂与葡萄糖酸钠缓凝剂的兼容性

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-03 DOI: 10.1016/j.cemconcomp.2025.106015

Tong Su, Qiang Wang, Kuizhen Fang, Jiameng Lu

{"title":"The compatibility of highly carboxylated polycarboxylate superplasticizer with sodium gluconate retarder in alkali-activated slag system","authors":"Tong Su, Qiang Wang, Kuizhen Fang, Jiameng Lu","doi":"10.1016/j.cemconcomp.2025.106015","DOIUrl":"10.1016/j.cemconcomp.2025.106015","url":null,"abstract":"<div><div>Fluidity control is a critical issue limiting the practical application of alkali-activated slag (AAS). In cement systems, the PCE is usually used combined with retarders for workability adjustment of fresh pastes because the dispersing ability of PCE alone drops quickly over time. However, there is a lack of relevant research in the AAS system. This paper investigates the effect of the combination of PCE and sodium gluconate (SG) retarder on the early workability and hydration of AAS based on the interaction among PCE, SG and slag. PCE existed in the form of aggregates in NaOH solution, and the size of the aggregates in 4M NaOH is larger than that in 3 M NaOH. Results show that SG incorporation significantly prevented the rapid loss of PCE dispersing ability over time due to its strong inhibition on the early hydration of AAS. The initial dispersing ability of PCE was also influenced, which was related to the activator concentration and the dosage of PCE. The initial dispersing ability of PCE was improved at dosages below 0.3 % regardless of the NaOH concentration, as the adsorbed SG occupied adsorption sites, preventing PCE aggregates from bridging multiple slag particles. With increasing PCE dosage, PCE competed with SG for adsorption sites on the slag surface. At 3 M NaOH concentration, the addition of SG reduced the adsorption amount of the smaller PCE aggregates and hence their initial dispersing ability. However, the larger PCE aggregates formed in 4 M NaOH exhibited stronger adsorption capacity than SG and their adsorption was not affected, thus their initial dispersing ability remained unchanged at 4 M NaOH.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"159 ","pages":"Article 106015"},"PeriodicalIF":10.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143532433","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

Experimental study on dynamic characterisation of ultra-high performance concrete (UHPC) after cryogenic freeze-thaw cycles

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-03-03 DOI: 10.1016/j.cemconcomp.2025.106011

Kaiyi Chi , Jun Li , Ruizhe Shao , Chengqing Wu

{"title":"Experimental study on dynamic characterisation of ultra-high performance concrete (UHPC) after cryogenic freeze-thaw cycles","authors":"Kaiyi Chi , Jun Li , Ruizhe Shao , Chengqing Wu","doi":"10.1016/j.cemconcomp.2025.106011","DOIUrl":"10.1016/j.cemconcomp.2025.106011","url":null,"abstract":"<div><div>The increasing demand for advanced construction materials capable of withstanding extreme environmental conditions has prompted extensive research into ultra-high performance concrete (UHPC). This study investigated the dynamic compressive properties of UHPC after cryogenic freeze-thaw (FT) cycles. UHPC specimens were exposed to 2, 4 and 8 FT cycles at −160 °C before being tested under dynamic loading conditions at the strain rate of 80, 130 and 180 s<sup>−1</sup> by the use of a Split Hopkinson Pressure Bar (SHPB) device. The effects of strain rate and FT cycles on the compressive strength, energy absorption capacity, and microstructural changes of UHPC were examined. Results revealed that dynamic compressive strength increased with strain rate for all FT cycle conditions. The study also found that the dynamic increase factor (DIF) of UHPC was influenced by FT exposure, higher DIFs were observed after more FT cycles. The DIF after 4 and 8 FT cycles increased 1.31 % and 2.61 %, respectively, in comparison with 2 FT cycles at the strain rate of 130 s<sup>−1</sup>. Repeated FT cycles led to progressive deterioration of the UHPC matrix and fibre-matrix interface, as evidenced by Scanning Electron Microscopy (SEM) analysis. After 8 FT cycles, the Calcium Silicate Hydrate (C-S-H) structure experienced further damage, with noticeable cracks forming between the steel fibres and matrix, indicating a weakening of the bond between these components. The behaviour and durability of UHPC under extreme environmental and dynamic loading conditions are better understood during this research.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"160 ","pages":"Article 106011"},"PeriodicalIF":10.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143532415","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