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工程科学与技术:2021,53(6):93-102
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微波辐射下含水率对混凝土力学性能影响
(1.西安建筑科技大学 土木工程学院,陕西 西安 710055;2.陕西省岩土与地下空间工程重点实验室,陕西 西安 710055)
Influence of Moisture Content on Concrete Mechanical Properties Under Microwave Irradiation
(1.School of Civil Eng., Xi’an Univ. of Architecture and Technol., Xi’an 710055, China;2.Shaanxi Key Lab. of Geotechnical and Underground Space Eng., Xi’an 710055, China)
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投稿时间:2020-11-16    修订日期:2021-02-26
中文摘要: 微波辅助混凝土骨料回收是一项污染少、能耗低的新型绿色技术。为探究微波辐射条件下含水率变化对混凝土加热效果及强度弱化的影响规律,分析微波加热完成后混凝土内部骨料与砂浆的分离效果,采用不同加热路径对混凝土试块进行加热,获得试块的升温特性,并利用单轴压缩试验得到不同含水率试块加热完成后的抗压强度。试验表明:微波辐射功率和含水率是影响混凝土破碎的2个重要因素;试块在含水率相对较高时,采用高功率微波连续加热混凝土,试块在短时低温下就会爆裂,骨料与砂浆分离界面明显,可以从破碎后的混凝土中剔选出较多砂浆附着率低的完整骨料。研究为微波辅助混凝土再生技术的进一步发展提供参考与借鉴。
Abstract:Microwave-assisted concrete aggregate recycling is a new green technology, with little pollution and low energy generated during the heating process. The influence of moisture content on the microwave heating effect and concrete strength weakening was explored, and the separation effect of aggregate and mortar in concrete after microwave heating was analysed. Different heating paths were utilized to heat the concrete test blocks to obtain their temperature rise characteristics, and the compressive strength of the test blocks with different moisture content after heating was obtained by conducting uniaxial compression tests. The testing results showed that microwave power and moisture content were two important factors affecting the concrete breaking. When the water content of the test block was relatively high, the test block would break under a short irradiation time and low temperature under higher microwave power input. The aggregate-mortar interface debonding occurred, which could reduce the adhesion of mortar on aggregate, and more complete aggregates with low mortar adhesion could be selected from the crushed concrete. The testing results may provide a reference for further development of microwave-assisted concrete recycling technology.
文章编号:202000996     中图分类号:TU528.0    文献标志码:
基金项目:国家自然科学基金面上项目(11872287);陕西省重点研发计划项目(2019ZDLGY01–10)
作者简介:第一作者:邵珠山(1968-),男,教授,博士.研究方向:混凝土和岩石材料热力学.E-mail:shaozhushan@xauat.edu.cn
引用文本:
邵珠山,张鹏举,魏玮,陈文文,张宏亮.微波辐射下含水率对混凝土力学性能影响[J].工程科学与技术,2021,53(6):93-102.
SHAO Zhushan,ZHANG Pengju,WEI Wei,CHEN Wenwen,ZHANG Hongliang.Influence of Moisture Content on Concrete Mechanical Properties Under Microwave Irradiation[J].Advanced Engineering Sciences,2021,53(6):93-102.