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材料导报  2020, Vol. 34 Issue (13): 13050-13057    https://doi.org/10.11896/cldb.19070017
  材料与可持续发展(三)一环境友好材料与环境修复材料* |
再生混凝土界面结构及耐久性综述
李恒1, 郭庆军1, 王家滨1, 张凯峰2
1 西安工业大学建筑工程学院,西安 710021
2 中建西部建设北方有限公司,西安 710065
Meso-/Micro-Structure of Interfacial Transition Zone and Durability of Recycled Aggregate Concrete: a Review
LI Heng1, GUO Qingjun1, WANG Jiabin1, ZHANG Kaifeng2
1 School of Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China
2 China West Construction North Co., Ltd, Xi’an 710065, China
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摘要 随着城市化进程加快,废弃混凝土产量与日俱增,其处理方式以堆放、填埋为主,严重破坏生态环境。推广使用废弃混凝土生产再生骨料并用于制备再生骨料混凝土,已成为研究热点。目前,再生混凝土已应用于城市新建结构中。
再生混凝土界面结构具有高孔隙率,水分及侵蚀性离子的扩散作用会加剧界面结构劣化,使界面成为再生混凝土的强度限制相。近年来,众多学者通过改善再生混凝土内界面过渡区结构,以提高再生混凝土的基本力学性能,增强再生混凝土耐久性能,并取得了丰硕成果。
相关学者分别从细、微观角度对界面结构展开深入研究,揭示了新、旧骨料砂浆间界面结构对再生混凝土性能的影响机理,并以再生骨料及界面结构的多孔性为切入点进行了诸多改善研究,包括骨料预浸、骨料裹浆、骨料碳化、掺加矿物掺合料、完善再生混凝土制备方法等,均取得了良好的成果,降低了再生骨料性质和界面结构对再生混凝土的消极作用。在我国温差较大、盐渍土丰富的西北地区,再生混凝土结构主要面临抗冻融循环和抗盐侵蚀耐久性问题。目前,相关学者通过一系列试验研究已基本探明再生混凝土的冻融循环和盐侵蚀机理,关于盐侵蚀研究,建立了氯离子迁移模型以用于氯离子迁移评估,并对单一种类离子侵蚀界面结构进行了显微分析。另外,提出降低再生混凝土水灰比、选用高品质再生骨料、掺加适量矿物掺合料和掺加剂,有助于减少界面过渡区生成,增强再生混凝土的耐久性。
本文归纳了再生混凝土的研究进展,对再生混凝土的界面结构、力学性能、抗冻融循环、抗盐侵蚀性能等方面进行了综合评述,梳理了再生混凝土力学性能和耐久性的改善方法,分析了再生混凝土研究面临的主要问题并展望其前景,以期为今后我国西北地区废弃混凝土可循环利用及再生混凝土结构耐久性评估奠定理论基础。
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LI Heng
GUO Qingjun
WANG Jiabin
ZHANG Kaifeng
关键词:  再生混凝土  界面结构  力学性能  冻融循环  盐侵蚀    
Abstract: With the continuous development of the city, the output of waste concrete is increasing gradually. The disposal method of waste concrete is stacking and landfill, which damages the ecological environment seriously. Promoting the production of recycled aggregate (RA) from waste concrete and preparing recycled aggregate concrete(RAC) from RA have become research hotspots. At present, RAC has been widely used in new urban structures.
The interfacial transition zone (ITZ) structure of RAC has highly porosity, and the diffusion of water and corrosive ions intensifies the deterioration of the ITZ. Therefore, the ITZ structure becomes the strength limiting phase of RAC. In recent years, in order to improve the mechanical properties and durability of RAC, scholars have made continuous research on promoting the ITZ structure, and achieved fruitful results.
The scholars conducted study on the ITZ structure from the perspective of meso- and micro-structure systematically, the influence mechanism of the ITZ structure between new and old aggregate mortar on the performance of RAC was revealed. At the same time, many improvements have been made with the porosity of the RA and ITZ structure as the entry point, including aggregate prewet, paste encapsulated, carbonation, mineral admixture, improvement of concrete preparation methods. These methods have achieved good results and reduced the negative effects of RA properties and ITZ structure on RAC. In the northwest China, the anti-freeze-thaw cycles and salt-resistance erosion are the main problems in the research of durability of RAC. Because the temperature difference is large and the saline soil is rich in this area. Currently, relevant scho-lars have basically proved the freeze-thaw cycle and salt erosion process mechanism of RAC through a series of experimental studies, the chloride ion diffusion model has been established for chloride ion diffusion assessment on salt erosion research. And made the microscopic analysis on the erosion ITZ structure of a single type of erosion ion. In addition, it is proposed to reduce the water-cement ratio of RAC, select high-quality RA, blend with appropriate amount of admixture and adulterating agent, which can reduce the formation of ITZ and improve the durability of RAC.
This paper summarizes the research progress of RAC, and reviews the ITZ structure, mechanical properties, freeze-thaw resistance and salt corrosion resistance of RAC comprehensively. The method for improving the mechanical properties and durability of RAC is combed. The main problems faced by RAC research are analyzed and its prospects are prospected, in order to lay a theoretical foundation for the future recycling of waste concrete and the durability evaluation of RAC structures in northwest China.
Key words:  recycled aggregate concrete    interfacial transition zone structure    mechanical properties    freeze-thaw cycle    salt erosion
               出版日期:  2020-07-10      发布日期:  2020-06-24
ZTFLH:  TU528  
基金资助: 国家自然科学基金(51908440);陕西省科技厅自然科学基础研究计划项目(2018JQ5032);陕西省教育厅自然科学研究专项(18JK0376)
通讯作者:  wangjiabin@xatu.edu.cn   
作者简介:  李恒,2018年6月毕业于西安工业大学,获得工学学士学位。现为西安工业大学硕士研究生,在王家滨老师的指导下进行混凝土耐久性研究。目前主要从事再生混凝土复合盐侵蚀耐久性研究。
王家滨,西安工业大学建筑工程学院,讲师。2017年1月毕业于西安建筑科技大学结构工程专业,获工学博士学位。同年加入西安工业大学建筑工程学院工作至今,主要从事喷射混凝土及再生混凝土耐久性研究。发表学术论文20余篇,SCI及EI检索10篇。
引用本文:    
李恒, 郭庆军, 王家滨. 再生混凝土界面结构及耐久性综述[J]. 材料导报, 2020, 34(13): 13050-13057.
LI Heng, GUO Qingjun, WANG Jiabin, ZHANG Kaifeng. Meso-/Micro-Structure of Interfacial Transition Zone and Durability of Recycled Aggregate Concrete: a Review. Materials Reports, 2020, 34(13): 13050-13057.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19070017  或          http://www.mater-rep.com/CN/Y2020/V34/I13/13050
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