Cement & concrete composites最新文献

{"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}

{"title":"Multi-scale analysis of degradation mechanisms in magnesium phosphate cement paste under wet-dry cycling","authors":"Zihan Zhou ,&nbsp;Haisen Jin ,&nbsp;Qinyuan Liang ,&nbsp;Qiang Wang ,&nbsp;Jianshuai Hao ,&nbsp;Shiyu Zhuang","doi":"10.1016/j.cemconcomp.2025.105939","DOIUrl":"10.1016/j.cemconcomp.2025.105939","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105939"},"PeriodicalIF":10.8,"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":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":"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 ,&nbsp;Kai-Hang Li ,&nbsp;Ying-Wu Zhou ,&nbsp;Hu Xu ,&nbsp;Can-Hao Zhao ,&nbsp;Ying Yu ,&nbsp;Zhuo-Cheng Li","doi":"10.1016/j.cemconcomp.2025.105937","DOIUrl":"10.1016/j.cemconcomp.2025.105937","url":null,"abstract":"<div><div>This study mainly investigated the effect and mechanism of graphene oxide (GO) on the nucleation of C-(A)-S-H in fly ash-slag based geopolymer. A variety of material characterization methods and electronic structure analysis methods were combined to analyze the nanostructure changes and electronic transitions generated during the reduction of GO in an alkaline environment. Based on this change, the effect of GO/RCO on the binding and mode of calcium ions was explored, which provided a basis for revealing the nucleation and development of C-(A)-S-H. The results show that, GO is reduced in an alkali-excited environment, resulting in nanostructure changes and the formation of a strong electron cloud/field at its edge, thereby changing its binding mode to calcium ions (from chemical binding to physical electrostatic adsorption). This physical-chemical change makes the edge of GO form a calcium ion enrichment environment, which provides sites and prerequisites for inducing and driving the nucleation and growth of C-(A)-S-H. However, excessive GO will lead to the metastable state and multi-aluminum phase structure of C-(A)-S-H, which is not conducive to the development of comprehensive properties such as mechanics of geopolymers.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105937"},"PeriodicalIF":10.8,"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":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":"Improved corrosion resistance of 316 stainless steel in calcium sulfoaluminate cement incorporated with red mud and citrate","authors":"Xiaocheng Zhou ,&nbsp;Jinjie Shi","doi":"10.1016/j.cemconcomp.2025.105940","DOIUrl":"10.1016/j.cemconcomp.2025.105940","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105940"},"PeriodicalIF":10.8,"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":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}