Cement & concrete composites最新文献_第9页

Corrosion resistance of zinc in a low-carbon binder with belitic calcium sulfoaluminate cement

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-27 DOI: 10.1016/j.cemconcomp.2025.105956

Wenxuan Li, Jinjie Shi

{"title":"Corrosion resistance of zinc in a low-carbon binder with belitic calcium sulfoaluminate cement","authors":"Wenxuan Li, Jinjie Shi","doi":"10.1016/j.cemconcomp.2025.105956","DOIUrl":"10.1016/j.cemconcomp.2025.105956","url":null,"abstract":"<div><div>This study investigated the passivation ability and chloride-induced corrosion behavior of galvanized steel in the pore solutions of belitic calcium sulfoaluminate (BCSA) cement. Pure zinc was used to simulate the galvanized coating, and ordinary Portland cement (OPC) solution was also tested for the comparison purpose. A comparable passivation behavior was observed for pure zinc in the OPC solution and a mixture solution of 50 % OPC and 50 % BCSA cement (abbreviated as PSA solution). On the one hand, due to the high Ca<sup>2+</sup> ion concentration and low alkalinity of the PSA solution, which is conducive to zinc passivity, a more stable protective layer of calcium hydroxyzincate (CHZ) was generated on the zinc surface. On the other hand, the passivation ability of zinc was reduced to some extent by the high SO<sub>4</sub><sup>2−</sup> ion concentration in the PSA solution. During the corrosion stage induced by exogenous chlorides, a different variation tendency was found for the corrosion resistance of zinc in OPC and PSA solutions over exposure time. Owing to the synergetic attack by SO<sub>4</sub><sup>2−</sup> and Cl<sup>−</sup> ions, the critical chloride concentration of zinc in the PSA solution was only 0.3 M, as determined by a sharp drop of <em>E</em><sub>corr</sub> and <em>R</em><sub>p</sub> values, while zinc in the OPC solution exhibited a much higher chloride resistance with the critical chloride concentration of 0.8 M. However, this detrimental effect on the corrosion resistance of zinc in the PSA solution was less pronounced with prolonged exposure due to the formation of protective corrosion products.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105956"},"PeriodicalIF":10.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044283","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

An innovative structural energy storage solution using fly ash-cement composites for net-zero energy buildings

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-27 DOI: 10.1016/j.cemconcomp.2025.105960

Ruidan Liu , Pan Feng , Zhaolong Liu , Long Yuan , Guanghui Tao , Zhenqi Yu , Xiangyu Meng , Jian Chen

{"title":"An innovative structural energy storage solution using fly ash-cement composites for net-zero energy buildings","authors":"Ruidan Liu , Pan Feng , Zhaolong Liu , Long Yuan , Guanghui Tao , Zhenqi Yu , Xiangyu Meng , Jian Chen","doi":"10.1016/j.cemconcomp.2025.105960","DOIUrl":"10.1016/j.cemconcomp.2025.105960","url":null,"abstract":"<div><div>The rapid advancement of renewable energy highlights the urgent need for safe, cost-effective, and scalable energy storage solutions, particularly for net-zero energy buildings. In this study, we introduce an innovative energy storage solution utilizing fly ash-cement composites (FCS) as multifunctional components. The FCS, incorporating fly ash as a mineral admixture, achieves a refined pore structure and homogeneous air void distribution during early hydration, leveraging the ball-bearing characteristics and pozzolanic effect of fly ash. The optimized FCS, containing 50 wt% fly ash, exhibited an impressive ionic conductivity of 25.6 mS cm<sup>−1</sup> and a compressive strength of 5.5 MPa after just one day of curing. When integrated into structural energy storage systems, it delivers a high specific capacitance of 102.4 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup>, an energy density of 73 Wh kg<sup>−1</sup>, and a power density of 76.3 W kg<sup>−1</sup>, maintaining 92.9 % capacitance retention over 2000 cycles. These results underscore the scalability, cost efficiency, and structural benefits of FCS, offering a promising pathway to integrate energy storage directly into buildings and infrastructure. Moreover, this strategy provides a sustainable, high-value application for large volumes of industrial solid waste while addressing energy challenges in extreme environments such as deep-sea, deep-earth, and extraterrestrial constructions.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105960"},"PeriodicalIF":10.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050074","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

Feasibility study of using carbonated and ultrasound treated electric arc furnace slag as a nano-enhanced supplementary cementitious material

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-27 DOI: 10.1016/j.cemconcomp.2025.105946

Jiongqi Chen , Weiyu Li , Wenjie Huang , Qiujin Chen , Yuwei Ma , Mingzhong Zhang , Zongjin Li , Jiyang Fu , Xiaowei Ouyang

{"title":"Feasibility study of using carbonated and ultrasound treated electric arc furnace slag as a nano-enhanced supplementary cementitious material","authors":"Jiongqi Chen , Weiyu Li , Wenjie Huang , Qiujin Chen , Yuwei Ma , Mingzhong Zhang , Zongjin Li , Jiyang Fu , Xiaowei Ouyang","doi":"10.1016/j.cemconcomp.2025.105946","DOIUrl":"10.1016/j.cemconcomp.2025.105946","url":null,"abstract":"<div><div>As a primary by-product of the electric arc furnace (EAF) steelmaking process, the relatively low carbonation capacity of EAF slag limits its use as a carbon-sequestering construction material. To address this limitation, this study proposed a two-step chemical-physical modification approach. First, a gas-solid carbonation process was applied, where humidity, temperature, CO₂ concentration, and carbonation duration were adjusted to specifically promote the growth of aragonite whiskers. Next, the carbonated EAF slag underwent liquid-phase ultrasound treatment, and the resulting liquid-solid mixture was used to prepare cement paste. The effect of the two-step modification was evaluated by characterizing the physical properties, microstructural evolution, and phase transformation of the EAF slag. The study further elucidated the feasibility of using modified EAF slag as a supplementary cementitious material (SCM) by examining its nucleation morphology, hydration products, and impact on hydration kinetics. Ultrasound treatment uniformly dispersed the aragonite whiskers, which acted as nanomaterials to fill the pores in the cement paste. Additionally, the exposed silica-rich surface facilitated the nucleation of C-S-H during hydration. The refined pore structure of the hardened paste ultimately resulted in a 30–50 % improvement in compressive strength compared to the untreated group and a 10–20 % increase compared to the pure ordinary Portland cement group. This study offers a novel perspective on utilizing EAF slag as an environmentally beneficial SCM, uncovering its potential properties while addressing the objectives of the CCUS strategy.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105946"},"PeriodicalIF":10.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044287","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

Influence of the water absorption-release processes of superabsorbent polymer with varying amounts of extra-entrained water on the surrounding cement paste

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-27 DOI: 10.1016/j.cemconcomp.2025.105953

Fangyu Chen , Jingjing Lyu , Xinchun Guan , Jing Qiao , Heqing Gou

{"title":"Influence of the water absorption-release processes of superabsorbent polymer with varying amounts of extra-entrained water on the surrounding cement paste","authors":"Fangyu Chen , Jingjing Lyu , Xinchun Guan , Jing Qiao , Heqing Gou","doi":"10.1016/j.cemconcomp.2025.105953","DOIUrl":"10.1016/j.cemconcomp.2025.105953","url":null,"abstract":"<div><div>This paper investigates the influence of the water absorption-release process of superabsorbent polymer (SAP) with varying amounts of extra-entrained water on the properties of the surrounding cement paste and the macroscopic cement paste. <sup>1</sup>H low-field nuclear magnetic resonance (NMR) was used to analyze the water absorption-release process of SAP. The macroscopic properties, including the void system, compressive strength, and autogenous shrinkage, were systematically examined. Furthermore, the degree of hydration, pore structure, and microscopic mechanical properties were investigated using large particle-size SAP (5 mm) to expand the internal curing zone. The results indicate the existence of an “equilibrium point” in the absorption-release process of SAP within cement paste. When exceeding the “equilibrium point”, the free water in the SAP is rapidly released, leading to an increase in the local water-cement ratio. This results in a looser pore structure and a reduction in the micro-mechanical properties of the internal curing zone, ultimately weakening the compressive strength. Conversely, when below the “equilibrium point”, SAP absorbs water, reducing the water-cement ratio, compacts the pore structure, and enhances the micro-mechanical properties of the internal curing zone. This improvement compensates for the reduction in compressive strength caused by voids. Additionally, when the extra-entrained water is below the “equilibrium point”, the more water entrained in SAP, the higher the gel and capillary water content, resulting in a greater reduction in autogenous shrinkage. However, when exceeding the “equilibrium point”, the content of gel and capillary water does not increase further, and autogenous shrinkage will not decrease any further.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105953"},"PeriodicalIF":10.8,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044284","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

Degradation behavior and self-healing mechanism of force-Cl- triggered microcapsule/ cementitious composites

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-25 DOI: 10.1016/j.cemconcomp.2025.105951

Yanxuan Ma , Shuaifei Wang , Meiyu Li , Gongbin Wang , Jiatong Liu , Yuhua Gao , Peng Wang , Zhipeng Zhang

{"title":"Degradation behavior and self-healing mechanism of force-Cl- triggered microcapsule/ cementitious composites","authors":"Yanxuan Ma , Shuaifei Wang , Meiyu Li , Gongbin Wang , Jiatong Liu , Yuhua Gao , Peng Wang , Zhipeng Zhang","doi":"10.1016/j.cemconcomp.2025.105951","DOIUrl":"10.1016/j.cemconcomp.2025.105951","url":null,"abstract":"<div><div>The performance of microcapsules in terms of “chloride response” and their electrochemical remediation mechanism is investigated. Electrochemical testing methods are used, i.e., kinetic potential polarization and electrochemical impedance testing. The variation rules of corrosion behavior of self-healing cementitious composites with different contents of microcapsules, both intact and pre-damaged, were investigated in a chloride ion environment. Based on this, the equivalent circuit change model is established. By fitting the parameters of the circuit elements, the change rule of the fitted parameters of the circuit elements is derived. To analyze the internal changes of self-healing cementitious composites in the corrosion process, and to reveal the self-healing mechanism of self-healing cementitious composites on the protective effect of its internal steel reinforcement. It was shown that the corrosion current density could be reduced as low as 0.87 μA/cm<sup>2</sup> for the intact samples immersed for 3 days and as low as 1.95 μA/cm<sup>2</sup> for damaged samples. The self-healing cementitious composites remained protective of the internal reinforcement after 56 days of immersion; Studies on the electrochemical self-healing mechanism have shown that microcapsules improve corrosion protection based on increasing the electrical resistivity of cementitious composites. The addition of 9 wt% microcapsules provided up to 39.16 % restoration efficiency at 56 days of immersion, and the restoration efficiency increased to up to 55.62 % in response to the combination of cracks and chloride ions. The microcapsules act together through mechanical and chloride ion response to retard the corrosion rate of steel reinforcement inside the self-healing cementitious composite by protecting the reinforcement passivation film.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"157 ","pages":"Article 105951"},"PeriodicalIF":10.8,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031204","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

Effect of silica fume on corrosion resistance of cement-based materials under carbonic acid water environment

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-25 DOI: 10.1016/j.cemconcomp.2025.105949

Jianhui Liu , Lurun Wu , Junmin Zhu , Hengrui Jia , Leping Liu , Shichong Zhang , Cong Yang , Zheng Chen , Caijun Shi

{"title":"Effect of silica fume on corrosion resistance of cement-based materials under carbonic acid water environment","authors":"Jianhui Liu , Lurun Wu , Junmin Zhu , Hengrui Jia , Leping Liu , Shichong Zhang , Cong Yang , Zheng Chen , 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}

引用次数: 0

Experimental investigation on the bond performance of a hybrid lap-spliced connection of GFRP and stainless steel bars in concrete

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-25 DOI: 10.1016/j.cemconcomp.2025.105952

Jiafeng Zhou , Jitong Zhao , Mengyan Peng , Marco Liebscher , Viktor Mechtcherine , Steffen Marx , Chongjie Kang

{"title":"Experimental investigation on the bond performance of a hybrid lap-spliced connection of GFRP and stainless steel bars in concrete","authors":"Jiafeng Zhou , Jitong Zhao , Mengyan Peng , Marco Liebscher , Viktor Mechtcherine , Steffen Marx , 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}

引用次数: 0

Estimating RC corrosion distribution from surface cracks using mesoscale analysis integrated with machine learning

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-25 DOI: 10.1016/j.cemconcomp.2025.105950

Tianyu Shao , Jie Luo , Kohei Nagai

{"title":"Estimating RC corrosion distribution from surface cracks using mesoscale analysis integrated with machine learning","authors":"Tianyu Shao , Jie Luo , 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}

引用次数: 0

Unveiling the synergistic effects of stray current and high hydraulic pressure on chloride transport in ultra-high-performance concrete

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-25 DOI: 10.1016/j.cemconcomp.2025.105957

Mingyue Chen , Xin Kang , Yongqing Chen , Renpeng Chen

{"title":"Unveiling the synergistic effects of stray current and high hydraulic pressure on chloride transport in ultra-high-performance concrete","authors":"Mingyue Chen , Xin Kang , Yongqing Chen , 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}

引用次数: 0

Study on the performance of polyester fibers modification system for low carbon magnesium silicate-based cementitious materials

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2025-01-24 DOI: 10.1016/j.cemconcomp.2025.105948

Yuan Jia , Junwei Zhu , Enci Zhao , Jingxi Zhang , Shibo Li , Yaoting Jiang , Tingting Zhang , Libo Liu

{"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":"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}

引用次数: 0