Workability and mechanical properties of microwave heating for recovering high quality aggregate from concrete

被引：24
作者：
Wei, Wei [1 ,2 ]
Shao, Zhushan [1 ,2 ]
Qiao, Rujia [1 ,2 ]
Chen, Wenwen [1 ,2 ]
Zhang, Pengju [1 ,2 ]
Cheng, Junxi [1 ,2 ]
机构：
[1] Xian Univ Architecture & Technol, Sch Civil Engn, Xian 710055, Peoples R China
[2] Shaanxi Key Lab Geotech & Underground Space Engn, Xian 710055, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 276卷
基金：
中国国家自然科学基金;
关键词：
Microwave; Concrete recycling; Microstructure; Chemical content; Energy consumption; Practical application; BEHAVIOR; CEMENT; CONSTRUCTION; INTERFACE; STRENGTH; DAMAGE; WASTE;
D O I：
10.1016/j.conbuildmat.2020.122237
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Microwave assisted concrete recycling is highlighted by a large number of research groups all over the world due to its potential for significant process benefit. In this paper, systematic experiments are established to investigate the heating process of mortar-aggregate under microwave irradiation. Four different aggregate types are selected that widely used as aggregates in concrete to represent different kinds of aggregates. The temperature field of both mortar and aggregate under different heating time and microwave power input are obtained. The crack formation, propagation and material damage during the heating process are graphically presented. XRD tests and SEM analysis are carried out to clarify the chemical content and microstructure variation around the aggregate-mortar interface before and after microwave heating. The mechanical properties of recycled concrete are evaluated through the UCS tests. Energy consumptions are tested during the heating process. The applications of microwave recovering aggregates from standard concretes are conducted based on the results obtained in the simplified concrete. The research proves that microwave irradiation could weaken the bonding between mortar and aggregate effectively, which provide a contribution and reference for the further application of microwave-assisted aggregates recycling. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：16
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