Cement & concrete composites最新文献_第2页

Hydration mechanism and potential as solid-state electrolytes in sodium chloride-magnesium phosphate composite 氯化钠-磷酸镁复合材料作为固态电解质的水合机制和潜力

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-19 DOI: 10.1016/j.cemconcomp.2024.105862

Xiangrui Meng , Muhammad Riaz Ahmad , Mingzheng Zhu , Bing Chen , Liyan Wang

{"title":"Hydration mechanism and potential as solid-state electrolytes in sodium chloride-magnesium phosphate composite","authors":"Xiangrui Meng , Muhammad Riaz Ahmad , Mingzheng Zhu , Bing Chen , Liyan Wang","doi":"10.1016/j.cemconcomp.2024.105862","DOIUrl":"10.1016/j.cemconcomp.2024.105862","url":null,"abstract":"<div><div>This study explores the feasibility of NaCl based magnesium phosphate cement (NaCl-MPC) composites as a solid electrolyte for energy storage applications by analyzing the physical, mechanical, hydration and electrochemical properties of composites. The results indicated that the incorporation of NaCl greatly improved the mechanical properties and ionic conductivity of composites, demonstrating enhanced electrochemical stability, making it a promising energy storage material. NaCl induced complex physical and chemical interactions within the MPC system by facilitating the filling of micropores and microcracks, providing the additional nucleation sites and converting intermediate products into struvite. NaCl also reacted chemically in the MPC system to produce small amounts of hazenite crystals. These effects ultimately led to the densification of the microstructure of MPC and significantly improved its mechanical properties. Generally, the improvement of ionic conductivity of solid electrolytes compromises their mechanical properties. However, the NaCl-MPC composites in this study showed significant improvement both in ionic conductivity and mechanical properties, highlighting their potential for advanced energy storage applications.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"156 ","pages":"Article 105862"},"PeriodicalIF":10.8,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670833","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

Hybrid effects of carbon nanotubes and nano-rubber on the mechanical properties and microstructure of oil well cement paste cured at different temperatures: Experimental studies and a micromechanical model 碳纳米管和纳米橡胶对不同温度下固化的油井水泥浆的力学性能和微观结构的混合效应：实验研究与微观力学模型

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-17 DOI: 10.1016/j.cemconcomp.2024.105842

Jiyun Shen , Yan Wang , Yongjin Yu , Pengcheng Fu , Mingliang Zhang , Longbang Qing , Rongwei Yang

{"title":"Hybrid effects of carbon nanotubes and nano-rubber on the mechanical properties and microstructure of oil well cement paste cured at different temperatures: Experimental studies and a micromechanical model","authors":"Jiyun Shen , Yan Wang , Yongjin Yu , Pengcheng Fu , Mingliang Zhang , Longbang Qing , Rongwei Yang","doi":"10.1016/j.cemconcomp.2024.105842","DOIUrl":"10.1016/j.cemconcomp.2024.105842","url":null,"abstract":"<div><div>A ductile oil well cement paste (OWCP) with lower autogenous shrinkage is of paramount importance to the integrity of cement sheath under downhole condition. Taking advantage of multiple experimental tests and a micromechanical model, the hybrid effects of nano-rubber (NR) and carbon nanotubes (CNTs) on the mechanical properties, autogenous shrinkage, hydration behavior and microstructure of OWCP were investigated in this study. Results show that the hybrid addition of NR and CNTs effectively enhances the mechanical properties and ductility of OWCP, 7-day tensile strengths of OWCP incorporated with 4 wt% NR and 0.04 wt% (N4C4) cured at 30 °C, 60 °C and 90 °C exhibit 1.4%, 13.7%, 13.0% strength gain with respect to those of plain OWCP (P) at the similar curing temperature; T/E ratios (tensile strength/Young’s modulus) of 7-day N4C4 cured at 30 °C, 60 °C and 90 °C exhibit 82.3%, 39.3% and 40.8% increase as compared to that of P at the similar curing temperature; the hybrid addition of NR and CNTs suppresses the autogenous shrinkage of OWCP, leading to about 31.9%, −12.8%, and 20.8% reduction of 72-hour autogenous shrinkage of OWCP at 30 °C, 60 °C and 90 °C, respectively. The developed micromechanical model is capable of well quantifying the hybrid effects of NR and CNTs on the mechanical/poroelastic properties of OWCPs. The present work is anticipated to shed light on the development of a ductile OWCP with lower autogenous shrinkage under harsh downhole conditions.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"156 ","pages":"Article 105842"},"PeriodicalIF":10.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665232","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 industrial multi-walled carbon nanotubes on the mechanical properties and microstructure of ultra-high performance concrete 工业多壁碳纳米管对超高性能混凝土力学性能和微观结构的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-17 DOI: 10.1016/j.cemconcomp.2024.105850

Sijie Deng , Jie Fan , Biliang Yi , Jianfeng Ye , Gengying Li

{"title":"Effect of industrial multi-walled carbon nanotubes on the mechanical properties and microstructure of ultra-high performance concrete","authors":"Sijie Deng , Jie Fan , Biliang Yi , Jianfeng Ye , Gengying Li","doi":"10.1016/j.cemconcomp.2024.105850","DOIUrl":"10.1016/j.cemconcomp.2024.105850","url":null,"abstract":"<div><div>To enhance the safety and functionality requirements of engineering structures, carbon nanotubes are used to improve the performance of concrete. However, their high cost limits their large-scale application. In this study, industrial multi-walled carbon nanotubes (IMWCNT) were employed to ultra-high performance concrete (UHPC) to achieve a balance between nanomodification and economy. The effects of different IMWCNT contents on the flowability, mechanical properties, and water resistance of UHPC were investigated. Moreover, the hydration products, microstructure, and fiber–matrix interface characteristics of UHPC specimens were analyzed using thermogravimetric analysis and scanning electron microscopy. The incorporation of appropriate amounts of IMWCNTs could effectively improve the mechanical properties and crack resistance of UHPC and partly prevent the infiltration of water into the matrix. Adding 0.1 wt% IMWCNTs resulted in optimal mechanical properties, and the flexural/compressive strengths of fiberless UHPC mortar and fibrous UHPC (2 vol% steel fibers) were increased by 6.7/5.2 % and 8.5/11.3 %, respectively. Microstructural analysis of the samples showed that uniformly dispersed IMWCNTs can enhance cement hydration and bridge the cracks at the microscale and nanoscale. In addition, incorporating an appropriate amount of IMWCNTs in UHPC reduced the porosity of its fiber–matrix interface and optimized steel fiber distribution in the matrix. Cost-benefit analyses results showed that although the addition of IMWCNTs increases the manufacturing cost of fibrous UHPC, their addition in moderate amounts (0.1 wt%) does not adversely affect the economic index due to the improvement in mechanical properties.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"156 ","pages":"Article 105850"},"PeriodicalIF":10.8,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142665229","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 nano-silica on mechanical properties and microstructure of engineered geopolymer composites 纳米二氧化硅对工程土工聚合物复合材料机械性能和微观结构的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-16 DOI: 10.1016/j.cemconcomp.2024.105849

Biqin Dong , Chenxi Liu , Eskinder Desta Shumuye , Yuanyuan Zhang , Hui Zhong , Guohao Fang

{"title":"Effect of nano-silica on mechanical properties and microstructure of engineered geopolymer composites","authors":"Biqin Dong , Chenxi Liu , Eskinder Desta Shumuye , Yuanyuan Zhang , Hui Zhong , Guohao Fang","doi":"10.1016/j.cemconcomp.2024.105849","DOIUrl":"10.1016/j.cemconcomp.2024.105849","url":null,"abstract":"<div><div>Engineered geopolymer composites (EGC) are promising alternatives to highly ductile cement-based composites, whereas effectively balancing the strength and ductility of most developed EGC mixes is challenging. This study systematically evaluated the feasibility of incorporating nano-silica (NS) particles to address the problem of balancing strength and ductility in EGC, aiming to develop EGC with extraordinary mechanical properties. The relationship between microstructure and mechanical properties of NS-EGC was studied via X-ray computed tomography (XCT) and backscattered electron microscopy (BSEM) tests, to gain an in-depth understanding of the obtained properties. Results indicate that NS-EGC mixes with superior compressive and tensile behaviour were successfully fabricated based on micromechanics design theory. The optimal NS content and particle size were 1 % and 15 nm, where the resulting composite outperformed all proposed EGC in terms of compressive strength (94 MPa), tensile strength (9.17 MPa) and tensile strain capacity (9.06 %). The mechanical properties of NS-EGC were strongly dependent on the pore structure, fibre orientation and fibre dispersion, where these microstructural effects can be modified by NS. This study provides a new approach to optimising the strength-ductility balance of EGC through nano-silica incorporation, offering the potential for broadening the application of EGC in high-performance structural materials.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"156 ","pages":"Article 105849"},"PeriodicalIF":10.8,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142642668","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

Exploiting Bacillus pseudofirmus and Bacillus cohnii to promote CaCO3 and AFt phase formation for stabilizing waste concrete fines 利用假芽孢杆菌和共生芽孢杆菌促进 CaCO3 和 AFt 相的形成以稳定废弃混凝土细料

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-15 DOI: 10.1016/j.cemconcomp.2024.105839

K. Kliková , P. Holeček , D. Koňáková , H. Stiborová , V. Nežerka

{"title":"Exploiting Bacillus pseudofirmus and Bacillus cohnii to promote CaCO3 and AFt phase formation for stabilizing waste concrete fines","authors":"K. Kliková , P. Holeček , D. Koňáková , H. Stiborová , V. Nežerka","doi":"10.1016/j.cemconcomp.2024.105839","DOIUrl":"10.1016/j.cemconcomp.2024.105839","url":null,"abstract":"<div><div>In this study, we explored the potential of microbiologically induced calcite precipitation (MICP) for enhancing the microstructural integrity of waste concrete fines (WCF). Traditionally, ureolytic bacteria, such as <em>Sporosarcina pasteurii</em>, have been widely used in MICP due to their ability to produce calcium carbonate via urea hydrolysis, but this process generates ammonia, raising environmental concerns. As an alternative, we employed the carbonic anhydrase pathway using <em>Bacillus pseudofirmus</em> and <em>Bacillus cohnii</em> to induce biomineralization without ammonia byproducts. We examined three types of WCF materials and found that samples containing gypsum facilitated the formation of AFt phases (ettringite/thaumasite crystals) when treated with these bacteria, significantly increasing WCF cohesion and forming strong conglomerates. Comparative analysis revealed that facultative anaerobes exploiting the carbonic anhydrase pathway outperformed ureolytic bacteria in strengthening the material. Investigations into pre-compaction and feather fiber reinforcement did not yield improvements in strength and stiffness.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105839"},"PeriodicalIF":10.8,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637471","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

Flexural post-cracking performance of macro synthetic fiber reinforced super workable concrete influenced by shrinkage-reducing admixture 受减缩外加剂影响的大体积合成纤维增强超强可加工混凝土的挠曲后开裂性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-13 DOI: 10.1016/j.cemconcomp.2024.105847

Jingjie Wei , Nima Farzadnia , Kamal H. Khayat

{"title":"Flexural post-cracking performance of macro synthetic fiber reinforced super workable concrete influenced by shrinkage-reducing admixture","authors":"Jingjie Wei , Nima Farzadnia , Kamal H. Khayat","doi":"10.1016/j.cemconcomp.2024.105847","DOIUrl":"10.1016/j.cemconcomp.2024.105847","url":null,"abstract":"<div><div>Most literature has focused on the effect of shrinkage-reducing admixture (SRA) in shrinkage mitigation resistance of concrete. This study aims to examine the impact of SRA on the efficiency of macro synthetic fibers (MSF) in enhancing the flexural post-cracking behavior of fiber-reinforced super workable concrete (FR-SWC). A comparative analysis of the influence of fiber combinations on the flexural post-cracking behavior of beams is also included. Results showed that a higher dosage of SRA, particularly at 5 % by mass of binder, had a noticeable negative impact on flexural post-cracking performance of beams while exhibiting positive effect on workability and shrinkage reduction. However, incorporating low dosages of SRA (1.25 % by mass of binder) did not have a significant impact on the ability of MSF. This was attributed to the reduction of the MSF-matrix bond strength caused by a significant delay in cement hydration. The characteristics of selected MSF type, including length and surface roughness had a positive effect on the post-cracking performance of FR-SWC, regardless of SRA dosage. The notched beams made with 100 % MSF<sub>A</sub> outperformed those made with fiber combination of 25 % MSFA and 75 % MSF<sub>B</sub>. Beams made with 100 % MSF<sub>A</sub> showed 55 % higher residual flexural tensile strength, 49 % higher equivalent flexural tensile strength, 50 % higher fracture energy, and 35 % higher equivalent flexural strength ratio compared to beams made with fiber combination of 25 % MSF<sub>A</sub> and 75 % MSF<sub>B</sub>. Therefore, the negative effect of SRA on the flexural-post cracking behavior can be partial compensated by adjusting MSF content and combinations.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105847"},"PeriodicalIF":10.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601783","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 CuSO4 content and pH on the mechanical properties and antibacterial ability of copper-plated cement-based material CuSO4 含量和 pH 值对镀铜水泥基材料力学性能和抗菌能力的影响

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-13 DOI: 10.1016/j.cemconcomp.2024.105848

Hongqiang Chu , Weiling Chen , Yi Fang , Yunchao Liang , Baolin Long , Fengchen Zhang , Wenwei Li , Linhua Jiang

{"title":"Effect of CuSO4 content and pH on the mechanical properties and antibacterial ability of copper-plated cement-based material","authors":"Hongqiang Chu , Weiling Chen , Yi Fang , Yunchao Liang , Baolin Long , Fengchen Zhang , Wenwei Li , Linhua Jiang","doi":"10.1016/j.cemconcomp.2024.105848","DOIUrl":"10.1016/j.cemconcomp.2024.105848","url":null,"abstract":"<div><div>Microbial induced concrete corrosion (MICC) is the main deterioration mode of concrete corrosion in concrete wastewater transportation system. Protective coating is one of the commonly used microbial corrosion protection technologies for concrete. In this study, the effects of CuSO<sub>4</sub> concentration and pH value of electroless plating solution on the preparation of copper-plated hardened cement paste (HCP) were investigated, and the antibacterial properties of HCP surface were optimized by electroless copper plating. The main components of the coating were copper and its oxide particles. When HCP was plated at the CuSO<sub>4</sub> concentration of 10 g/L, the copper coating with high mass gain (0.3 %) and Vickers hardness (212.0 HV) was obtained. In addition, cubic copper structure constituted a compact copper coating HCP. The plating solution with pH of 9 was helpful to obtain the best quality gain and Vickers hardness of the coating. The microscopic morphology analysis showed that the coating had a relatively dense structure. Besides, antibacterial test indicated that copper-plated HCP had a significant improvement in antibacterial performance.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105848"},"PeriodicalIF":10.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142601699","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

A novel all-solid-waste binder prepared by salt-alkali synergistic activation system constructed from phosphogypsum, soda residue and calcium carbide slag 利用磷石膏、碱渣和电石渣构建的盐碱协同活化体系制备的新型全固体废物粘合剂

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-10 DOI: 10.1016/j.cemconcomp.2024.105841

Di Wang , Zhaoyun Zhang , Weichao Guo , Jianyuan Li , Xuewei Li , Qingxin Zhao

{"title":"A novel all-solid-waste binder prepared by salt-alkali synergistic activation system constructed from phosphogypsum, soda residue and calcium carbide slag","authors":"Di Wang , Zhaoyun Zhang , Weichao Guo , Jianyuan Li , Xuewei Li , Qingxin Zhao","doi":"10.1016/j.cemconcomp.2024.105841","DOIUrl":"10.1016/j.cemconcomp.2024.105841","url":null,"abstract":"<div><div>Conventional alkali-activated slag materials apply strong industrial alkalis with high cost and potential corrosion risk. Alternatively, this study utilized industrial solid waste phosphogypsum, soda residue, and calcium carbide slag to construct a salt-alkali synergistic activated system. A new salt-alkali synergistic activation effect was formed by the SO<sub>4</sub><sup>2−</sup> introduced by PG together with the Cl<sup>−</sup> and OH<sup>−</sup> provided by SR and CS, which promoted the hydration reaction. AFt, Friedel's salt, C-(A)-S-H, and other hydration products were generated and congregated, and a new all-solid-waste binder was created with 3d/28d strengths of 17.9/43.9 MPa, meeting the P·O 42.5 cement strength standard requirements. By conducting compressive strength and drying shrinkage tests on mortar and paste specimens with varying ratios, and employing XRD, TG-DTG, FTIR, and SEM-EDS analyses, the mechanical attributes of the binder were systematically assessed, and its hydration process was elucidated.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105841"},"PeriodicalIF":10.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142596498","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

Layer interface characteristics and adhesion of 3D printed cement-based materials exposed to post-printing temperature disturbance 暴露于打印后温度干扰的 3D 打印水泥基材料的层界面特性和附着力

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-10 DOI: 10.1016/j.cemconcomp.2024.105837

Yi Zhang , Yaxin Tao , Jose R.A. Godinho , Qiang Ren , Zhengwu Jiang , Kim Van Tittelboom , Geert De Schutter

{"title":"Layer interface characteristics and adhesion of 3D printed cement-based materials exposed to post-printing temperature disturbance","authors":"Yi Zhang , Yaxin Tao , Jose R.A. Godinho , Qiang Ren , Zhengwu Jiang , Kim Van Tittelboom , Geert De Schutter","doi":"10.1016/j.cemconcomp.2024.105837","DOIUrl":"10.1016/j.cemconcomp.2024.105837","url":null,"abstract":"<div><div>The layer interface, which is vital for the performance and longevity of 3D printed cement-based materials (3DPCM), is very sensitive to the environmental conditions because of the lack of formwork. Nevertheless, the current limited understanding of how temperature affects the layer interface has restricted the application of 3D printing in different construction scenarios. Here, we revealed the effects of temperature on the multi-scale phase distribution features of the layer interface through mercury intrusion porosimetry, X-ray computed tomography, nanoindentation and scanning electron microscopy with energy dispersive spectroscopy techniques. Additionally, the interlayer bond strength of 3DPCM was evaluated via the splitting tensile test. Small amplitude oscillation, surface roughness and isothermal calorimetry measurements were employed for an in-depth analysis of the mechanisms. Results indicate that an increase in temperature post-printing reduces the discrepancies in aggregate volume fraction between the layer interface and bulk matrix due to the increasing structuration rate and the amount of cement paste at the interface due to the reduced settlement of aggregates. The porosity difference between the layer interface and bulk matrix decreased with increasing temperature due to the pore size refinement by faster filling with hydrates. In addition, a more concentrated distribution of atomic ratios and elastic modulus of hydrates were observed at the layer interface of 3DPCM hardened at higher temperatures. Increased curing temperature improves the interlayer bond strength of 3DPCM owing to the enhanced aggregate interlocking, reduced porosity and improved high-density CSH content.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105837"},"PeriodicalIF":10.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142596501","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

Enhancing fire resistance of lightweight high-performance cementitious composites using hollow microspheres 利用空心微球增强轻质高性能水泥基复合材料的耐火性能

IF 10.8 1区工程技术

Cement & concrete composites Pub Date : 2024-11-10 DOI: 10.1016/j.cemconcomp.2024.105845

Jingwei Yang , Hyunuk Kang , Jusung Yang , Junil Pae , Caijun Shi , Juhyuk Moon

{"title":"Enhancing fire resistance of lightweight high-performance cementitious composites using hollow microspheres","authors":"Jingwei Yang , Hyunuk Kang , Jusung Yang , Junil Pae , Caijun Shi , Juhyuk Moon","doi":"10.1016/j.cemconcomp.2024.105845","DOIUrl":"10.1016/j.cemconcomp.2024.105845","url":null,"abstract":"<div><div>Fire is detrimental to skyscrapers. Lightweight high-performance concrete (L-HPC) developed by combining lightweight microspheres and ultra-high-performance concrete binder is promising for future mega infrastructure projects. This study investigates the fire resistance of lightweight high-performance cementitious composites developed using hollow ceramic microspheres (HCMs) and hollow glass microspheres (HGMs) at different temperatures. Experimental results show that incorporating lightweight microspheres significantly increases the residual compressive strength of L-HPC by maintaining those of HGMs and HCMs groups at 92 % and 78 %, respectively, at 900 °C. Furthermore, these lightweight microspheres effectively mitigate thermal spalling and crack propagation in L-HPC. Microstructural analysis indicates that the lightweight microspheres facilitate steam-pressure release. The melting of HGMs realizes interconnections in the pore channel, which are subsequently strengthened by HGM and matrix-binder reactions. The HCMs feature perforated shells that provide inert and high-temperature-resistant steam channels. This study confirms that L-HPC developed using the abovementioned strategy exhibits excellent fire resistance.</div></div>","PeriodicalId":9865,"journal":{"name":"Cement & concrete composites","volume":"155 ","pages":"Article 105845"},"PeriodicalIF":10.8,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142596499","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