ANALYSIS OF SPLITTING TENSILE PROPERTIES OF CONCRETE UNDER MICROWAVE AND CONVENTIONAL HEATING CONDITIONS

被引：0
作者：
Wei W. [1 ,2 ]
Zhang H.-L. [3 ]
Shao Z.-S. [1 ]
Jiang Y.-S. [3 ]
机构：
[1] School of Science, Xi’an University of Architecture and Technology, Shaanxi, Xi’an
[2] Post-Doctoral Research Center, School of Architecture, Xi’an University of Architecture and Technology, Shaanxi, Xi’an
[3] School of Civil Engineering, Xi’an University of Architecture and Technology, Shaanxi, Xi’an
来源：
Gongcheng Lixue/Engineering Mechanics | 2024年 / 41卷 / 05期
关键词：
Brazilian splitting test; concrete; conventional heating; energy consumption; microwave heating; strength weakening;
D O I：
10.6052/j.issn.1000-4750.2022.05.0414
中图分类号：
学科分类号：
摘要：
Microwave-assisted concrete coarse aggregate recycling technology has attracted extensive attention from scholars at home and abroad due to its green, effective, and low aggregate damage recycling properties. A multi-mode microwave resonator and conventional muffle furnace were employed to heat the cylindrical concrete specimens with different energy inputs. The investigation was performed for the heating efficiency, macroscopic crack expansion, material failure mode, splitting tensile strength weakening laws, and the influence laws of heating parameters on energy consumption and on energy efficiency. In addition, the mechanism of tensile strength weakening of concrete under microwave irradiation was analyzed through the scanning electron microscopy (SEM) tests. The experimental results show that the microwave heating technology has higher heating efficiency and can effectively promote crack propagation along the mortar-aggregate interface and then weaken the concrete strength. The higher the microwave power, the higher the thermal efficiency of concrete, the greater strength loss of concrete, and the lower the energy consumption. However, the mortar-aggregate interface was still compact under conventional heating, with no visible cracks occurred, and the energy efficiency during heating process was only about 1%. © 2024 Tsinghua University. All rights reserved.
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页码：134 / 145
页数：11
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