Cement and Concrete Composites最新文献

{"title":"Study on the performance of polyester fibers modification system for low carbon magnesium silicate-based cementitious materials","authors":"Yuan Jia, Junwei Zhu, Enci Zhao, Jingxi Zhang, Shibo Li, Yaoting Jiang, Tingting Zhang, Libo Liu","doi":"10.1016/j.cemconcomp.2025.105948","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105948","url":null,"abstract":"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.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"38 1","pages":""},"PeriodicalIF":0.0,"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":0,"RegionCategory":"","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, Kanghao Yu, Tong Zhang, Yuting Wang","doi":"10.1016/j.cemconcomp.2025.105936","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105936","url":null,"abstract":"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.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"103 1","pages":""},"PeriodicalIF":0.0,"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":0,"RegionCategory":"","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, Jinping Ou, Dongsheng Li, Aamer Muhammad Bhutta, Georgios Zapsas, Waleed Nasser, Mohammed Mehthel, Oscar Salazar, Victor C. Li","doi":"10.1016/j.cemconcomp.2025.105947","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105947","url":null,"abstract":"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 C76). The developed ECC pipes hold promise for the next generation of sustainable pipelines.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"38 1","pages":""},"PeriodicalIF":0.0,"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":0,"RegionCategory":"","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, Jian-Xin Lu, Yuqing Zhang, Chi Sun Poon","doi":"10.1016/j.cemconcomp.2025.105944","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105944","url":null,"abstract":"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.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"127 1","pages":""},"PeriodicalIF":0.0,"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":0,"RegionCategory":"","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, Tae Yong Shin, Jae Hong Kim","doi":"10.1016/j.cemconcomp.2025.105943","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105943","url":null,"abstract":"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.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"13 1","pages":""},"PeriodicalIF":0.0,"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":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-scale analysis of degradation mechanisms in magnesium phosphate cement paste under wet-dry cycling","authors":"Zihan Zhou, Haisen Jin, Qinyuan Liang, Qiang Wang, Jianshuai Hao, Shiyu Zhuang","doi":"10.1016/j.cemconcomp.2025.105939","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105939","url":null,"abstract":"Magnesium phosphate cement paste (MPC) is a promising rapid-repair material for pavements but is prone to degradation under wet-dry (W-D) cycling, which limits its durability. Current research lacks a detailed understanding of the damage and degradation mechanisms of MPC under these conditions. This study investigates the macroscopic mechanical behavior and mesoscopic damage progression of MPC during W-D cycling. Results reveal that initial W-D cycles enhance the strength and modulus of MPC due to secondary hydration, followed by a decline and a shift in failure mode from brittle to ductile. Damage advances from the exterior inward, with increased pore connectivity and changes in fracture modes, from tensile splitting to tensile-shear failure driven by W-D-induced macrocracks. Key degradation mechanisms include K-struvite dissolution, uneven thermal swelling, and fatigue from cyclic moisture. This work provides insights for enhancing the mechanical performances of MPC in moisture-variable environments.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142988081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nano-mechanism of graphene oxide reinforced fly ash-slag based geopolymer materials to form high polymerization degree C-(A)-S-H: A new view of physical-chemical synergistic effect","authors":"Ben Li, Kai-Hang Li, Ying-Wu Zhou, Hu Xu, Can-Hao Zhao, Ying Yu, Zhuo-Cheng Li","doi":"10.1016/j.cemconcomp.2025.105937","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105937","url":null,"abstract":"In this paper, the reduction process of graphene oxide (GO) under alkali excitation environment and its chemical composition, nanostructure and electronic energy level evolution were investigated. Based on this, the effect of reduced graphene oxide on calcium ions and the mechanism of inducing and promoting the nucleation and development of C-(A)-S-H hydration products in fly ash-slag based geopolymer materials were discussed. The experimental results show that when graphene oxide is dispersed in an alkaline activator, its nano-sheet edge restores the partially conjugated structure of the graphite lattice, and the nano-morphology that originally existed in a folded form tends to be flat. At the same time, the oxygen-containing functional groups of graphene oxide are weakened, but the van der Waals force between the layers increases and the energy transition between the electron cloud and the electron energy level occurs. The alkali-activated reduced graphene oxide changed its binding mode and binding ability to calcium ions and provided nano-sites for the nucleation of C-(A)-S-H. Reduction reaction of GO makes the geopolymer material come from a calcium-rich environment, drives the production of C-(A)-S-H with high calcium content and high degree of polymerization, and induces the degree of substitution of Al-O tetrahedron for Si-O tetrahedron. The above research results provide new ideas for the study of the mechanism or nano-scale simulation of graphene oxide materials to improve geopolymer materials or cement-based materials.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved corrosion resistance of 316 stainless steel in calcium sulfoaluminate cement incorporated with red mud and citrate","authors":"Xiaocheng Zhou, Jinjie Shi","doi":"10.1016/j.cemconcomp.2025.105940","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105940","url":null,"abstract":"The incorporation of red mud (RM) in calcium sulfoaluminate (CSA) cement offers a cost-effective and environmentally friendly solution for rehabilitation engineering, resulting in reduced carbon emissions. However, it may further reduce the setting time of CSA cement, thus causing inconvenience during construction. Moreover, the corrosion resistance of steel in CSA cement blended with RM is unclear. Therefore, in this study, CSA cement blended with RM and citrate has been specifically designed for rehabilitation engineering where citrate functions as both retarding admixture and corrosion inhibitor. Although RM negatively affects the passivity of 316 stainless steel (316ss), it enhances the pitting corrosion resistance of 316ss in CSA cement blended with RM. Furthermore, the formation of a citrate-related protective layer contributes to the improved passivation ability and pitting corrosion resistance of 316ss in CSA cement incorporated with RM and citrate.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the induced mechanical deterioration of ASR-affected concrete under varied moisture and temperature conditions","authors":"O.D. Olajide, M.R. Nokken, L.F.M. Sanchez","doi":"10.1016/j.cemconcomp.2025.105942","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105942","url":null,"abstract":"Moisture and temperature are critical for developing alkali-silica reaction (ASR) in concrete. However, the influence of these exposure conditions on ASR-induced deterioration, specifically mechanical property losses, has not been well studied. To further our understanding, concrete cylinders made with Spratt reactive coarse aggregates and boosted in alkalis to 5.25kg/m³ <span><span style=\"\"></span><span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\" /&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"0.24ex\" role=\"img\" style=\"vertical-align: -0.12ex;\" viewbox=\"0 -51.7 0 103.4\" width=\"0\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"></math></span></span><script type=\"math/mml\"><math></math></script></span> were manufactured and stored at three different temperatures (i.e., 21°C, 38°C, and 60°C) under numerous relative humidities (i.e., 100%, 90%, 82%, 75%, and 62%). The reduction in mechanical properties was assessed using the stiffness damage test (SDT), direct shear and compressive strength tests. Overall, most results for mechanical properties showed a strong linear trend with expansion, with the exception of the modulus of elasticity and shear strength. In low moisture conditions that experienced both drying shrinkage and ASR, the expansion level associated with a given mechanical property loss differs from that in high moisture conditions due to early age cracks that developed in the cement paste. In most published research, expansion is the primary criteria used in assessing role of exposure conditions. However, it was found that expansion levels alone are not reliable indicators of induced deterioration due to the coupled mechanism. Furthermore, the impact of this phenomenon varies with the different mechanical properties assessed. Additionally, the moisture threshold required for the reaction was evaluated by considering the impact on mechanical properties.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism Analysis of Microwave-Carbonation Solidification for Carbide Slag-Based Low-Carbon Materials","authors":"Run-Sheng Lin, Yongpang Liao, Chaoshu Fu, Ting-Hong Pan, Rongxin Guo, Xiao-Yong Wang","doi":"10.1016/j.cemconcomp.2025.105938","DOIUrl":"https://doi.org/10.1016/j.cemconcomp.2025.105938","url":null,"abstract":"This study proposes an innovative strategy for compacting carbide slag-based low-carbon bricks (CS-LCB) through a combination of microwave and carbonation curing, aiming to improve the properties through microwave pretreatment combined with carbonation curing and to realize the preparation of low-carbon materials. The effects of microwave pretreatment on the main properties of CS-LCB-containing limestone and fly ash were systematically investigated. After carbonation curing, the pressed CS-LCB exhibited strong strength and effective CO₂ capture capacity. The nucleation effect of limestone helps accelerate the carbonation rate of CS-LCB. In contrast, the interaction between fly ash and carbide slag effectively improves the microstructure. Microwave pretreatment further accelerates the pozzolanic reaction and early carbonation rate of fly ash and carbide slag, improving the early strength of CS-LCB. Additionally, after 14 days of carbonation, CS-LCB retained more than 70.8% of its initial strength below 500 °C but nearly completely lost its strength at 900 °C.","PeriodicalId":519419,"journal":{"name":"Cement and Concrete Composites","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}