Cement & concrete composites最新文献_第9页

Uncovering the mechanism controlling strength and microstructural evolution of belite-rich cement-based materials at different temperatures 揭示不同温度下控制富菱镁矿水泥基材料强度和微结构演变的机制

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-26 DOI: 10.1016/j.cemconcomp.2024.105765

Jing Xie , Zemei Wu , Xuanhan Zhang , Xiang Hu , Caijun Shi

{"title":"Uncovering the mechanism controlling strength and microstructural evolution of belite-rich cement-based materials at different temperatures","authors":"Jing Xie , Zemei Wu , Xuanhan Zhang , Xiang Hu , Caijun Shi","doi":"10.1016/j.cemconcomp.2024.105765","DOIUrl":"10.1016/j.cemconcomp.2024.105765","url":null,"abstract":"<div><div>The effect of temperature on the properties of belite-rich cement-based (BRC) materials is different from that on Portland cement (PC). This study provides a comprehensive understanding of the mechanisms controlling strength and microstructural evolution at different temperatures, especially C-S-H characteristics, of BRC materials. Phase assemblage, pore structure, and microscopic morphology of BRC paste, as well as phase composition and structure, chemically bound water, and bulk density of C-S-H were investigated using X-ray diffraction (XRD), thermogravimetric analysis (TGA), <sup>1</sup>H and <sup>29</sup>Si nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The strength of BRC mortar increased with temperature is because of the higher hydration degree of β-C<sub>2</sub>S, lower porosity (except for 60 °C), and increased main chain length (MCL) of C-S-H. Hydration degrees of 28-d β-C<sub>2</sub>S and C<sub>3</sub>S increased by 202.5 % and 16.3 %, respectively, while MCL increased by 39.4 % from 5 to 60 °C. The higher temperature sensitivity of β-C<sub>2</sub>S is due to its activation energy being 12.4 % greater than that of C<sub>3</sub>S in BRC paste. Additionally, gel porosity decreased with temperature due to decreased bound water content and increased 16.7 % bulk density of C-S-H from 5 to 60 °C. Finally, the CaO/SiO<sub>2</sub> was inversely proportional to MCL and bulk density, but positively to H<sub>2</sub>O/SiO<sub>2</sub>. The findings deepen the mechanistic understandings of the hydration kinetics and microstructural evolution for temperature-affected BRC material.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105765"},"PeriodicalIF":10.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329949","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

Tailoring of steel fiber surface by coating cellulose nanocrystal for enhanced flexural properties of UHPC 通过涂覆纤维素纳米晶调整钢纤维表面以增强超高强度混凝土的抗弯性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-25 DOI: 10.1016/j.cemconcomp.2024.105773

Jiang Du , Yuhuan Wang , Pengwei Guo , Weina Meng

{"title":"Tailoring of steel fiber surface by coating cellulose nanocrystal for enhanced flexural properties of UHPC","authors":"Jiang Du , Yuhuan Wang , Pengwei Guo , Weina Meng","doi":"10.1016/j.cemconcomp.2024.105773","DOIUrl":"10.1016/j.cemconcomp.2024.105773","url":null,"abstract":"<div><div>Ultra-high-performance concrete (UHPC) is an advanced generation of cementitious composites with excellent compressive strength and durability. However, the relatively poor interfacial transition zone (ITZ) between steel fibers and UHPC matrix leads to insufficient flexural properties and hinders its further applications. This study proposed a cost-effective, sustainable, and highly reactive coating material, cellulose nanocrystals (CNCs), to densify the ITZ of steel fiber surfaces, thus enhancing the flexural properties of UHPC. Utilizing the Herschel-Bulkley model, the critical concentration of 1.0 % is determined for enabling uniform dispersion of CNCs, enhancing the coating performance and reliability. The performance of CNCs as coating materials was evaluated by flexural test of UHPC with CNCs-coated steel fibers, pull-off test, scanning electron microscope (SEM), atomic force microscope (AFM), energy-dispersive spectroscopy (EDS), and Fourier-transform infrared spectroscopy (FTIR). Results showed that compared to UHPC with pristine steel fibers, the flexural strength and toughness of UHPC with CNCs-coated steel fibers were increased by up to 14 % and 18 %, because the single fiber pull-off energy was increased by 50 %. It can be attributed to the densified ITZ which is validated by the increased UHD C-S-H and HD C-S-H on ITZ. However, when the concentration of CNCs suspension (i.e., 1.5 %) exceeds the critical value, the CNCs coating film would stick the uniformly dispersed steel fibers together and then affect their distribution, thus reducing the mechanical performance of UHPC. This work provides a green and effective approach for promoting flexural properties and an in-depth understanding of CNCs coating mechanism.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105773"},"PeriodicalIF":10.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329950","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

Doped multi-walled carbon nanotubes and nanoclay based-geopolymer concrete: An overview of current knowledge and future research challenges 掺杂多壁碳纳米管和基于纳米粘土的土工聚合物混凝土：当前知识和未来研究挑战综述

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-25 DOI: 10.1016/j.cemconcomp.2024.105774

Kamal Kishore, M. Neaz Sheikh, Muhammad N.S. Hadi

{"title":"Doped multi-walled carbon nanotubes and nanoclay based-geopolymer concrete: An overview of current knowledge and future research challenges","authors":"Kamal Kishore, M. Neaz Sheikh, Muhammad N.S. Hadi","doi":"10.1016/j.cemconcomp.2024.105774","DOIUrl":"10.1016/j.cemconcomp.2024.105774","url":null,"abstract":"<div><div>This in-depth review aims to shed light on the application of nanoclay and multi-walled carbon nanotubes in geopolymer concrete. It comprehensively examines the profound impact of these nanomaterials on the physical, chemical, and mechanical properties of geopolymer concrete. The review delves into the intricate details of the properties exhibited by nanoclay and multi-walled carbon nanotubes, providing valuable insights into their unique physical and chemical characteristics. It also explores the methodologies adopted for their dispersion and the underlying functionalities within geopolymer composite. The review highlights advanced imaging and characterization techniques essential for understanding surface and mechanical properties. The review compares imaging techniques (scanning electron microscopy, transmission electron microscopy, helium ion microscopy, and atomic force microscopy), emphasizing their importance in characterizing mechanical properties of nanocomposites. A detailed discussion on the fresh and hardened mechanical properties, specifically compressive and flexural strength, of geopolymer concrete incorporating nanoclay and multi-walled carbon nanotubes is also included. Addressing key challenges and offering perspectives on future developments in the realm of geopolymer concrete, this review serves as a comprehensive exploration of the subject.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105774"},"PeriodicalIF":10.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing the flexural toughness of UHPC through flexible layer-modified aggregates: A novel interfacial toughening strategy 通过柔性层改性集料增强超高性能混凝土的抗弯韧性：新型界面增韧策略

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-24 DOI: 10.1016/j.cemconcomp.2024.105770

Kai Yang , Guangcheng Long , Zhuo Tang , Wengui Li , Gang Ma , Chengyang Li , Youjun Xie

{"title":"Enhancing the flexural toughness of UHPC through flexible layer-modified aggregates: A novel interfacial toughening strategy","authors":"Kai Yang , Guangcheng Long , Zhuo Tang , Wengui Li , Gang Ma , Chengyang Li , Youjun Xie","doi":"10.1016/j.cemconcomp.2024.105770","DOIUrl":"10.1016/j.cemconcomp.2024.105770","url":null,"abstract":"<div><div>Enhancing the interfacial deformability of UHPC positively impacts its toughness and durability. In this work, a novel interfacial toughening strategy was proposed and employed for UHPC, in which the aggregates were treated with polyacrylate emulsion (PL) or PL modified by silica fume or carbon nanotubes to form an interfacial flexible layer (FL). The flexural characteristics of the prepared UHPC were comprehensively investigated, with attention to the damage evolution based on acoustic emission. Meanwhile, the corresponding toughening mechanism was discussed. The results showed that the FL modified by carbon nanotubes effectively enhanced the flexural deformation capacity, energy absorption capacity, and toughness of UHPC, while maintaining flexural strength. Introducing FL reduced ringing count and acoustic emission energy and mitigated damage rate of UHPC. The FL altered the flexural damage mode of UHPC by alleviating stress concentration to prevent sudden matrix cracking and fiber debonding. During the elastic stage, FL and the UHPC matrix jointly sustained tensile cracks, enhancing the matrix's energy absorption capacity, which correlated positively with the percentage of tensile cracks. In the softening stage, this capacity correlated positively with the percentage of shear cracks. Moreover, FL reduced the probability of microcracks at the interface. Although the FL reduced the average microhardness at the interface, it stabilized the performance of hydration products and increased their maximum microhardness. The FL promoted interfacial energy dissipation and synergistically bridged microcracks with steel fibers, ultimately enhancing the flexural toughness of UHPC.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105770"},"PeriodicalIF":10.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323595","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

Multiphysical testing of strength development of cemented paste backfill containing superplasticizer 含超塑化剂的水泥浆回填土强度发展的多重物理测试

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-24 DOI: 10.1016/j.cemconcomp.2024.105772

Zubaida Al-Moselly, Mamadou Fall

{"title":"Multiphysical testing of strength development of cemented paste backfill containing superplasticizer","authors":"Zubaida Al-Moselly, Mamadou Fall","doi":"10.1016/j.cemconcomp.2024.105772","DOIUrl":"10.1016/j.cemconcomp.2024.105772","url":null,"abstract":"<div><div>Current laboratory procedures for curing and testing the mechanical strength of cemented paste backfill (CPB) do not take into account the complex Multiphysics (thermal, T; hydraulic, H; mechanical, M; chemical, C) processes that CPB structures are subjected to in the field. This oversight can lead to unreliable measurements and unsafe designs. In this study, a multiphysical curing and testing procedures for CPB with superplasticizer (CPB-PES) has been developed to evaluate its strength development under THMC curing conditions close to those encountered in the field. The obtained results demonstrated that the strength development of CPB-PES is greatly affected by the THMC factors and their interactions. The contributions of each one of the investigated THMC factors on the strength are not equally similar and greatly depend on the interaction between these factors and curing time. CPB samples with 0.125 % PES that underwent drainage during THMC curing showed a strength increase of up to 809 % after 28 days of curing, compared to the control samples. The strength of CPB-PES samples cured under THMC can be up to 57 % higher than that of samples cured under THC conditions. The results indicate a significant interaction between thermal (T; elevated field curing temperature) and chemical (C; superplasticizer and cement hydration) factors, between chemical (C) and mechanical (M; field curing stress) factors, as well as between thermal and mechanical factors. The influence of the mechanical factor on strength development was observed to be less pronounced compared to the impact of chemical and thermal factor, and is reduced at elevated curing temperatures. The findings underscore the critical importance of accounting for field-relevant THMC factors and their interactions in the determination of the CPB-PES strength development, which is essential for the design of safer and more economical CPB structures, ultimately enhancing mine productivity and safety.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105772"},"PeriodicalIF":10.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142323700","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}

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Rapid CO2 catalytic activation of binary cementing system of CSA and Portland cement 二氧化碳快速催化活化 CSA 和硅酸盐水泥二元胶结体系

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-24 DOI: 10.1016/j.cemconcomp.2024.105771

Yang Liu , Hanxiong Lyu , Lu Zhu , Lucen Hao , Shipeng Zhang , Chi Sun Poon

{"title":"Rapid CO2 catalytic activation of binary cementing system of CSA and Portland cement","authors":"Yang Liu , Hanxiong Lyu , Lu Zhu , Lucen Hao , Shipeng Zhang , Chi Sun Poon","doi":"10.1016/j.cemconcomp.2024.105771","DOIUrl":"10.1016/j.cemconcomp.2024.105771","url":null,"abstract":"<div><div>This study presents a novel approach to activating a binary cementing system composed of calcium sulfoaluminate (CSA) cement and ordinary Portland cement (OPC) using an instant CO<sub>2</sub> catalysis. The activation led to significant and rapid strength enhancement, with the binary cement achieving a strength of 15.42 MPa immediately after activation, all within 1 min. The rapid CO<sub>2</sub> activation catalyzed a notable heat release, accelerating the hydration of ye'elimite to form ettringite, which is a crucial component capable of bridging gaps and imparting high initial strength. Simultaneously, the CO<sub>2</sub> activation catalyzed the increase in sulfur concentration, which in turn, also facilitated the formation of ettringite at an early age. Subsequent strength development was attributed to belite hydration. Apart from the rapid strength gain, employing CO<sub>2</sub> activation facilitated control over the pH value of the pore solution, thus enabling the manipulation of ettringite's crystal morphology to strategically enhance the microstructure. Samples with lower pH values exhibited needle-like ettringite formations, whereas samples with higher pH values yielded rod-like and column-like ettringite crystal structures. Comprehensive analytical investigations were analyzed using XRD, FTIR, TGA, <sup>27</sup>Al NMR, MIP, SEM, and ICP-OES. The present study provides a new perspective on the potential application of CSA-based cement, such as precast concrete element, instant concrete product delivery, and urgent reconstruction.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105771"},"PeriodicalIF":10.8,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326381","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

Enhanced thermal insulation and structural health monitoring with ultra-lightweight ECC incorporating air entrainment and cenospheres 超轻型 ECC 采用空气夹流和仙人球技术，增强了隔热性能和结构健康监测能力

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-23 DOI: 10.1016/j.cemconcomp.2024.105768

Hongyu Ran , Mohamed Elchalakani , Pouria Ayough , Xin Lyu , Mohamed Ali Sadakkathulla , Jingming Cai , Tianyu Xie

{"title":"Enhanced thermal insulation and structural health monitoring with ultra-lightweight ECC incorporating air entrainment and cenospheres","authors":"Hongyu Ran , Mohamed Elchalakani , Pouria Ayough , Xin Lyu , Mohamed Ali Sadakkathulla , Jingming Cai , Tianyu Xie","doi":"10.1016/j.cemconcomp.2024.105768","DOIUrl":"10.1016/j.cemconcomp.2024.105768","url":null,"abstract":"<div><div>This study presents an approach to produce multifunctional ultra-lightweight engineered cementitious composites (ULW-ECCs) spanning an air-dried density ranging from 1398 to 572 kg/m³ utilizing air-entraining agents (AEA) and fly ash cenospheres. The multifunctional ULW-ECCs combine exceptional mechanical properties with enhanced thermal insulation, self-sensing and self-healing functions. Variation of the AEA content results in compressive strengths ranging from 65.92 to 2.82 MPa, tensile strengths from 5.75 to 0.84 MPa, tensile strain capacities of 6.67 %–2.92 %, and flexural strengths of 14.41 to 3.64 MPa. Thermal insulation properties, including conductivity (20 °C: 0.73–0.20 W/(mK); 800 °C: 0.289–0.065 W/(mK)) across different temperatures, effusivity and volumetric heat capacity, were systematically tested. The small-scale thermal insulation test confirms the outstanding performance of ULW-ECCs in thermal insulation. Furthermore, ULW-ECC exhibits excellent self-sensing ability under tension and bending. Resonant frequency and impedance testing results affirm the self-healing ability. Microstructural analysis using an optical microscope, scanning electronic microscope (SEM), and mercury intrusion porosimeter (MIP) reveals that high-speed mixing, cenospheres, AEA and long polyethylene fibres are crucial for achieving porous structures, low-density and multifunctionality. This novel ULW-ECC holds promising applications in structural retrofitting, enhancing energy efficiency, thermal insulation, fire resistance and enabling simultaneous structural health monitoring.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105768"},"PeriodicalIF":10.8,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319689","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

Preparation activated tailings by pH swing process: Towards yielding cemented tailings backfill and in-situ CO2 mineralization 通过 pH 值摆动法制备活性尾矿：实现胶结尾矿回填和就地二氧化碳矿化

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-21 DOI: 10.1016/j.cemconcomp.2024.105767

Sijia Liu , Haiyun Gu , Ken Yang , Junyuan Guo , Kai Wu , Lijie Guo , Zhenghong Yang , Linglin Xu

{"title":"Preparation activated tailings by pH swing process: Towards yielding cemented tailings backfill and in-situ CO2 mineralization","authors":"Sijia Liu , Haiyun Gu , Ken Yang , Junyuan Guo , Kai Wu , Lijie Guo , Zhenghong Yang , Linglin Xu","doi":"10.1016/j.cemconcomp.2024.105767","DOIUrl":"10.1016/j.cemconcomp.2024.105767","url":null,"abstract":"<div><div>In-situ CO<sub>2</sub> mineralization of tailings holds great potential for large-scale CO<sub>2</sub> sequestration, but its development is seriously limited by the low CO<sub>2</sub> conversion rate. This study proposed an innovative pH swing process to produce activated tailings through magnesium extraction from raw tailings and subsequent leachate precipitation. By the combination of activated tailings and high-belite calcium sulfoaluminate cement, a new type of cemented activated tailings backfill (CATB) was developed. The results demonstrate that 82.33 % of magnesium is extracted from raw tailings and precipitates in the form of Mg(OH)<sub>2</sub> serving as the dominating carbonation active phase during the pH swing process. Besides the aragonite forms in the carbonated cemented raw tailings backfill (CRTB), carbonated CATB also contains calcite, nesquehonite, and hydromagnesite. Substituting activated tailings for raw tailings results in a higher CO<sub>2</sub> absorption capability (ranging from 8.88 % to 14.17 % with various binder-to-tailings ratios). These indicate that the activated tailings have a promising application scenario in large scale in-situ CO<sub>2</sub> mineralization.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105767"},"PeriodicalIF":10.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316109","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

Temperature induced fast-setting of cement based mineral-impregnated carbon-fiber reinforcements for durable and lightweight construction with textile-reinforced concrete 水泥基矿物浸渍碳纤维加固材料的温度诱导快速凝固，用于纺织品加固混凝土的耐久性和轻质施工

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-21 DOI: 10.1016/j.cemconcomp.2024.105766

Jitong Zhao, Ameer Hamza Ahmed, Marco Liebscher, George Karalis, Rifat Al Saif, Marko Butler, Viktor Mechtcherine

{"title":"Temperature induced fast-setting of cement based mineral-impregnated carbon-fiber reinforcements for durable and lightweight construction with textile-reinforced concrete","authors":"Jitong Zhao, Ameer Hamza Ahmed, Marco Liebscher, George Karalis, Rifat Al Saif, Marko Butler, Viktor Mechtcherine","doi":"10.1016/j.cemconcomp.2024.105766","DOIUrl":"10.1016/j.cemconcomp.2024.105766","url":null,"abstract":"<div><div>Developing durable and sustainable mineral-impregnated carbon-fiber (MCF) reinforcement system is today an effective measure to solve common service issues of conventional steel or FRP reinforcement in building sector. This study introduces a novel methodology for the design and realization of fast-setting cement based MCF reinforcements via targeted thermal activation. The process involves impregnating continuous yarns with a micro-sized particle cement suspension utilizing custom-built manufacturing equipment. Subsequently, the impregnated yarns undergo controlled heating at moderate temperatures to accelerate the cure process and strength development. Flexural and tensile performance of the MCFs exhibits progressive improvements with longer curing durations (from 2 to 20 h) and higher temperatures (from 40 °C to 60 °C). Enhanced mechanical properties are attributed to advanced hydration reactions and microstructural densification, as proven by thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP), scanning electron microscopy, isothermal calorimetry and micro-computed tomography (μCT). When heating at 60 °C for 20 h, as-produced MCFs demonstrate optimal tensile strength of 2747 MPa and flexural strength of 482 MPa, with exceptional bond with concrete substrate, comparable to conventional FRPs. The proposed post-treatment shows promising potential for significantly enhancing the flexibility of mineral matrix composites, making them suitable for a wide range of industrial and field applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105766"},"PeriodicalIF":10.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142423668","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

Effect of carbonation curing on the characterization and properties of steel slag-based cementitious materials 碳化固化对钢渣基胶凝材料特性和性能的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-09-21 DOI: 10.1016/j.cemconcomp.2024.105769

Xinyue Liu , Xiaoming Liu , Zengqi Zhang , Xianbin Ai

{"title":"Effect of carbonation curing on the characterization and properties of steel slag-based cementitious materials","authors":"Xinyue Liu , Xiaoming Liu , Zengqi Zhang , Xianbin Ai","doi":"10.1016/j.cemconcomp.2024.105769","DOIUrl":"10.1016/j.cemconcomp.2024.105769","url":null,"abstract":"<div><div>Steel slag (SS)-based cementitious materials usually exhibit poor bulk stability, poor early activity and low mechanical strength, which greatly limits the consumption of SS in construction materials. Carbonation curing can not only control volume expansion but also improve the mechanical properties and durability of SS-based cementitious materials. First, the physicochemical properties of the SS were summarized. Then, the reaction mechanism of carbonation curing was analyzed. Next, the mineral composition, microstructure, morphology and CO<sub>2</sub> uptake of the SS-based materials during carbonation curing were discussed, and the effects of carbonation curing on the mechanical properties, volume stability and durability of the SS-based materials were investigated. Finally, some suggestions for the application of carbonation curing in SS-based materials were given. The development and application of carbonation curing in SS-based materials can achieve the large-scale utilization of SS in cementitious materials and the effective reduction of CO<sub>2</sub> emissions.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"154 ","pages":"Article 105769"},"PeriodicalIF":10.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142306474","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