Cement & concrete composites最新文献

{"title":"Effect of silica fume on corrosion resistance of cement-based materials under carbonic acid water environment","authors":"Jianhui Liu ,&nbsp;Lurun Wu ,&nbsp;Junmin Zhu ,&nbsp;Hengrui Jia ,&nbsp;Leping Liu ,&nbsp;Shichong Zhang ,&nbsp;Cong Yang ,&nbsp;Zheng Chen ,&nbsp;Caijun Shi","doi":"10.1016/j.cemconcomp.2025.105949","DOIUrl":"10.1016/j.cemconcomp.2025.105949","url":null,"abstract":"<div><div>The effect of silica fume (SF) on corrosion depth, mass loss and compressive strength of mortar specimens over time under carbonic acid water environment were studied in this study. In addition, the thermal gravimetric analysis (TG-DTG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the product evolution and microstructure of cement paste under such environment. Moreover, the corrosion process under carbonic acid water environment of cement-based materials was systematically discussed. A comprehensive explanation of the corrosion process was proposed, detailing the dynamic progression of CH leaching, carbonation, and deterioration over time and space. SF has different action mechanisms in different stages. On one hand, the addition of SF slightly increases the overall corrosion depth expansion rate due to reduced matrix alkalinity. In addition, it can promote the formation of calcium silicate hydrate (C-S-H) gels with a low Ca/Si ratio and densifies the microstructure of cement-based materials, thereby reducing mass loss and strength reduction and delaying the progression of deterioration depth under carbonic acid water environment. This study provides a comprehensive elucidation of the influence mechanism of SF on the carbonic acid water corrosion process in cementitious materials, offering new insights for enhancing concrete durability.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105949"},"PeriodicalIF":10.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031205","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":"Experimental investigation on the bond performance of a hybrid lap-spliced connection of GFRP and stainless steel bars in concrete","authors":"Jiafeng Zhou ,&nbsp;Jitong Zhao ,&nbsp;Mengyan Peng ,&nbsp;Marco Liebscher ,&nbsp;Viktor Mechtcherine ,&nbsp;Steffen Marx ,&nbsp;Chongjie Kang","doi":"10.1016/j.cemconcomp.2025.105952","DOIUrl":"10.1016/j.cemconcomp.2025.105952","url":null,"abstract":"<div><div>This paper investigates the bond performance of a hybrid lap-spliced connection of glass fiber reinforced polymer (GFRP) bars and stainless steel bars in concrete. To gain a comprehensive understanding, micro-level and macro-level mechanical studies are conducted. First, the microstructural characterization of GFRP bars is performed to comprehend the specific material features. Then, cantilever tests are conducted to identify the optimal direction of bar grooves, which is pre-cut by a machine, and to place the distributed fiber optical sensor (DFOS). Subsequently, four-point flexural tests are carried out on eight large-scale specimens to investigate the influence of lap-spliced length and type on the specimen responses. The DFOSs are employed in the grooves of lap-spliced GFRP and stainless steel bars to characterize their bond behaviors. The findings indicate a significant enhancement in load capacity, with an increase of approximately 10 kN for every 100 mm increase in the lap-spliced length. Furthermore, the incorporation of a hybrid connection, combining GFRP and stainless steel bars, demonstrates a slight improvement of 5 kN in load capacity over the pure lap-spliced connection of stainless steel bars. Additionally, detailed investigations are conducted on the strain distributions in the lap-spliced bars.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105952"},"PeriodicalIF":10.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031206","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}

{"title":"Estimating RC corrosion distribution from surface cracks using mesoscale analysis integrated with machine learning","authors":"Tianyu Shao ,&nbsp;Jie Luo ,&nbsp;Kohei Nagai","doi":"10.1016/j.cemconcomp.2025.105950","DOIUrl":"10.1016/j.cemconcomp.2025.105950","url":null,"abstract":"<div><div>Understanding the degree of reinforcing bar corrosion in reinforced concrete (RC) structures is crucial for evaluating their residual performance. This study proposes a simulation system for estimating the distribution of corrosion along the rebar of a RC beam member based on surface crack widths. The system integrates the rigid body spring model (RBSM) with machine learning methods. The inputs are surface crack widths and the desired output is the distribution of corrosion-induced expansion. A large dataset of training samples for machine learning is generated by running RBSM simulations using different expansion distributions. After training with this dataset, the neural network is able to correlate inputs and outputs, allowing it to estimate an expansion distribution from given cracking data. The estimated expansion distribution is then used to simulate the surface cracks using RBSM, and the error between the given (input) cracking data and simulated cracks is returned as an input to the trained network in order to optimize the results and enhance performance of the system. The applicability of this RBSM-neural network system is validated using both synthetic and experimental test data. The estimation results correlate well with the target data, demonstrating the effectiveness of the system in estimating internal expansive strain along the rebar and reproducing the cracking distribution using surface crack data. Internal distributions of cracking and stress are extracted from the simulations, providing additional information for analyzing structural performance.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105950"},"PeriodicalIF":10.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031362","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":"Unveiling the synergistic effects of stray current and high hydraulic pressure on chloride transport in ultra-high-performance concrete","authors":"Mingyue Chen ,&nbsp;Xin Kang ,&nbsp;Yongqing Chen ,&nbsp;Renpeng Chen","doi":"10.1016/j.cemconcomp.2025.105957","DOIUrl":"10.1016/j.cemconcomp.2025.105957","url":null,"abstract":"<div><div>Ultra-high-performance concrete (UHPC) is a promising material for constructing future deep underground spaces owing to its exceptional toughness and durability. Nevertheless, the potential impact of stray currents and high hydraulic pressure on the durability of UHPC in deep underground electric projects (such as subways and electric railways) remains elusive. Moreover, existing experimental setups are inadequately equipped to simulate these extreme conditions. To address this challenge, we developed a novel designed ultra-deep underground corrosion simulation system to study the synergistic effects of high hydraulic pressure and stray currents on the chloride ion transport in UHPC. The results indicate that stray currents cause the corrosion of steel fibers, which in turn elevates the porosity of UHPC(rising from 1.45 % to 2.96 %). This porosity increase enhances the hydraulic conductivity of UHPC, intensifying the impact of high hydraulic pressure on chloride ion transport. The extreme gradient boosting (XGBoost)model revealed that stray current is the dominant factor affecting chloride ion transport, contributing to approximately 83 % of the impact. Numerical simulations demonstrated that the omission of steel fiber corrosion leads to an underestimation of chloride ion transport speed. Finally, a time-dependent model for the effective diffusion coefficient of chloride ions was developed. Based on the measured data, it was found that accounting for the coupled effects of high hydraulic pressure and stray currents increases the cover layer thickness from 17 mm to 57 mm. This study provides valuable guidance for the durability of deep underground UHPC structures.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105957"},"PeriodicalIF":10.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031240","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":"Study on the performance of polyester fibers modification system for low carbon magnesium silicate-based cementitious materials","authors":"Yuan Jia ,&nbsp;Junwei Zhu ,&nbsp;Enci Zhao ,&nbsp;Jingxi Zhang ,&nbsp;Shibo Li ,&nbsp;Yaoting Jiang ,&nbsp;Tingting Zhang ,&nbsp;Libo Liu","doi":"10.1016/j.cemconcomp.2025.105948","DOIUrl":"10.1016/j.cemconcomp.2025.105948","url":null,"abstract":"<div><div>To mitigate the environmental hazards posed by discarded plastics, polyester fibers produced from such waste have been incorporated into building composites. However, the durability of polyester fibers in cementitious environments is compromised by high alkalinity, which may lead to resource wastage. In this study, polyester fibers were embedded in magnesium silicate hydrate to develop a novel, highly reinforced material. The mechanical properties of this composite were investigated through compression tests and four-point bending test, with variations in fiber content and curing periods. Among many organic fibers, polyester fibers are more effective in improving the fracture toughness of the magnesium silicate hydrate system without reducing the compressive strength. Optimal properties were achieved with a fiber content of 1.5 %, exhibiting a compressive strength of 44.2 MPa and ultimate bending toughness reaching 5.8 MPa at 28 days. To further investigate the toughening mechanisms, the fiber-matrix interface was characterized using scanning electron microscopy, single fiber pull-out tests, alkali solution immersion, infrared Fourier transform spectroscopy, and nanoindentation tests. Bending toughness test and monofilament drawing test indicate that polyester fibers are more suitable for use in low-alkali hydration magnesium silicate systems compared to traditional portland cement gelling systems. Scanning electron microscopy and nanoindentation analyses showed that polyester fibers exhibit superior bonding properties with magnesium silicate hydrate composites and enhance their ductility. Analysis of alkali solution immersion revealed that polyester fibers are eroded in high alkaline environments, primarily due to hydrolytic degradation of ester bonds on fiber surfaces.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105948"},"PeriodicalIF":10.8,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026363","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":"Advanced spectroscopic and microscopic insights into cement biodeterioration in sulfur-rich sewer systems","authors":"Janette Ayoub ,&nbsp;Tony Pons ,&nbsp;Marielle Guéguen Minerbe ,&nbsp;Guilhem Simon ,&nbsp;Gwénaël Gouadec ,&nbsp;Sabrina Guérin ,&nbsp;Vincent Rocher ,&nbsp;Marc Offroy ,&nbsp;Mario Marchetti","doi":"10.1016/j.cemconcomp.2025.105955","DOIUrl":"10.1016/j.cemconcomp.2025.105955","url":null,"abstract":"<div><div>The biodeterioration of cementitious materials within sewer networks remains a critical problem that compromises the structural integrity and lifespan of these infrastructures essential to water treatment. This study pioneers the use of micro-Raman spectroscopic mapping, coupled with chemometric tools, to investigate the impact of high H₂S levels and bacterial activity on high-resistance cementitious matrices (CEM V and CAC) over a four-year period. The research aims to assess how severe environmental conditions affect these materials and identify the resulting phases formed. By utilizing this pioneering approach, the study reveals notable differences in behavior between cement types, with the presence of gypsum, bayerite, native sulfur, and CaCO₃ polymorphs in the altered layers. Raman spectroscopy, combined with chemometrics techniques, facilitated the identification of distinct microstructural zones within the specimens. Complementary SEM-EDS analysis provided consistent insights into element distribution and micro-texture changes, confirming degradation mechanisms and highlighting the material's resistance or susceptibility to aggressive environments.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105955"},"PeriodicalIF":10.8,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031241","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":"Characterizing and modelling the bond-slip behaviour of steel bars in 3D printed engineered cementitious composites","authors":"Meng Chen ,&nbsp;Kanghao Yu ,&nbsp;Tong Zhang ,&nbsp;Yuting Wang","doi":"10.1016/j.cemconcomp.2025.105936","DOIUrl":"10.1016/j.cemconcomp.2025.105936","url":null,"abstract":"<div><div>Embedding rebars in 3D printed engineered cementitious composites (3DP-ECC) promises to improve the structural toughness and loading capacity, while a robust bond between them is critical for digital construction with reinforcements. This paper presents a series of pull-out tests on the bond behaviour between rebars and 3DP-ECC to investigate the effects of variable rebar arrangement direction, diameter and anchorage length. Results indicate that the failure patterns mainly showed pull-out failure due to the lower probability of interlayer splitting failure caused by the improved interlayer fracture resistance capacity in 3DP-ECC compared to ordinary 3D printed concrete. The rebar direction most significantly affected the slip stage in the bond stress-slip curve, whereas the rebar diameter and anchorage length had almost no effect on the curves. The bond strength of the printed specimens in the parallel direction enhanced by 2.9%–10.5 % than that in the vertical direction, while it declined by 27.4%–27.6 % as the rebar diameter increased from 8 to 14 mm. Moreover, a bond-slip constitutive model for steel bar reinforced 3DP-ECC was established to predict the bond behaviour as a function of the rebar location and physical characteristics. The exploration of the bond behaviour and constitutive relationships of steel bar reinforced 3DP-ECC provides a basis for integrated performance evaluation in practical application.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105936"},"PeriodicalIF":10.8,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992206","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":"Bottom-up innovation for sustainable leakproof Engineered Cementitious Composites (ECC) pipe: Design method, ECC material, and pipe structure","authors":"He Zhu ,&nbsp;Jinping Ou ,&nbsp;Dongsheng Li ,&nbsp;Aamer Bhutta ,&nbsp;Georgios Zapsas ,&nbsp;Waleed Nasser ,&nbsp;Mohammed Mehthel ,&nbsp;Oscar Salazar ,&nbsp;Victor C. Li","doi":"10.1016/j.cemconcomp.2025.105947","DOIUrl":"10.1016/j.cemconcomp.2025.105947","url":null,"abstract":"<div><div>Low-carbon, low-cost, and durable water pipelines are urgently needed for sustainable cities. In this study, low carbon, cost-effective, leakproof Engineered Cementitious Composites (ECC) pipes were developed benefiting from the proposed ECC pipe design model and material innovation. The proposed model has been experimentally validated on ECC beam and ECC pipe. The developed desert sand Engineered Cementitious Composites attained the highest tensile strength (12.6 MPa) and ductility (12.1 %) among the published desert sand ECCs, enabling a sustainable ECC pipe with thinner wall thickness while attaining higher performance. Under the three-edge loading test, the deformation capacity of ECC pipe was 4–6 times that of steel reinforced concrete (RC) pipes. Even with two-thirds the wall thickness of an RC pipe, ECC pipes reached 2.6 times in load capacity of the highest Class V pipes (ASTM <span><span>C76</span><svg><path></path></svg></span>). The developed ECC pipes hold promise for the next generation of sustainable pipelines.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105947"},"PeriodicalIF":10.8,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992205","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 photocatalytic efficiency and interfacial bonding on cement-based surfaces by constructing CaO-TiO2 hybrid catalysts","authors":"Xunli Jiang ,&nbsp;Jian-Xin Lu ,&nbsp;Yuqing Zhang ,&nbsp;Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.105944","DOIUrl":"10.1016/j.cemconcomp.2025.105944","url":null,"abstract":"<div><div>The application of titanium dioxide (TiO₂) coating in cement-based materials faces challenges regarding its durability. This study presented the concept of ‘induced bonding’ for enhancing coating adhesion. By modifying TiO₂ with CaO, nucleation sites were constructed on its surface, inducing the growth of hydration products and connecting the catalytic materials to the substrate. As a result, a novel dual-effect CaO-TiO₂ hybrid catalytic material with enhanced photocatalytic efficiency and interfacial bonding was successfully developed using a mechanochemical-thermochemical method. The CaO-TiO₂ catalyst was coated onto cement surfaces, and the mechanisms of interface enhancement were revealed by micro-scratch and microstructural tests. The results indicated that the synthetic catalytic materials exhibited excellent NO photocatalytic degradation performance, particularly at an activation temperature of 300 °C; the optimized NO degradation efficiency hit around 40 % with a NO_x comprehensive removal amount approximately twice that of conventional TiO₂. Moreover, the minimal generation of NO₂ demonstrated a strong photocatalytic selectivity. This exceptional photocatalytic performance can be attributed to the interaction between TiO₂ and CaO, along with its derivatives such as CaTiO₃ and CaCO₃, which promoted the formation of active species (•OH, •O²⁻, h⁺), and increased the absorption efficiency in the visible light region. Furthermore, the wear resistance and interface critical load of CaO-TiO₂ coatings were more robust than reference coatings. The CaO-TiO₂ catalyst promoted hydration to form widely distributed and interlocked fibrous C-S-H gel, bridging the catalyst particles and enhancing the adhesion of the coating with the cement substrate, thereby improving its interfacial bonding performance.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105944"},"PeriodicalIF":10.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990776","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":"Unbiased rheological properties determined by adversarial training with Bingham equation","authors":"In Kuk Kang ,&nbsp;Tae Yong Shin ,&nbsp;Jae Hong Kim","doi":"10.1016/j.cemconcomp.2025.105943","DOIUrl":"10.1016/j.cemconcomp.2025.105943","url":null,"abstract":"<div><div>The Bingham model is generally used to describe the flow of cement-based materials, and its parameters, such as yield stress and plastic viscosity, are measured using a rheometer. However, the rheological measurement does not provide the unique Bingham parameters for a single material when rheometers take different rheological geometries or measuring protocols. This study constructs a model that can yield the ideal Bingham parameters with the rheological measurement. We first introduce the generation of an ideal domain strictly following the Bingham equation, and then an unsupervised domain adaptation by adversarial training makes it possible to match the rheological measurement with the ideal Bingham parameters. The proposed model is applied to the experimental data measured with mortar samples, where the measurements for a single sample are conducted by three different measuring protocols. The resultant (ideal) Bingham parameters are identical regardless of the protocols used.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105943"},"PeriodicalIF":10.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990775","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}