Acoustic emission characteristics and Kaiser effect of recycled aggregate concrete
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摘要: 作为一种应用日益广泛的无损检测技术，声发射技术可作为再生混凝土损伤研究突破的重要手段。为研究再生混凝土的声发射特性及Kaiser效应，基于声发射技术，利用不同再生粗骨料取代率的再生混凝土单轴压缩过程中声发射能量的变化来预测裂缝的开展，分析优势频率随取代率的变化关系，并对不同取代率的再生混凝土进行循环加卸载来验证Kaiser效应的存在性。试验结果表明，再生混凝土存在Kaiser效应，但与普通混凝土不同的是，再生混凝土的Kaiser效应无应力下限，而应力上限有所提高。Abstract: As an increasing widely used non-destructive testing technology, acoustic emission technology can be used as an important means for breakthroughs in the research of recycled concrete damage. In order to study the acoustic emission characteristics and Kaiser effect of recycled concrete, the change of the acoustic emission energy of recycled concrete with different replacement rates of recycled coarse aggregate during uniaxial compression was used to predict the development of cracks, and the dominant frequency was analyzed with the replacement rate. The relationship between the changes and the cyclic loading and unloading of recycled concrete with different substitution rates was carried out to verify the existence of the Kaiser effect. The test results show that the Kaiser effect exists in recycled concrete, but unlike ordinary concrete, there is no lower stress limit for the Kaiser effect of recycled concrete, but the upper stress limit is increased to some extent.
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Keywords:
- recycled concrete /
- acoustic emission /
- Kaiser effect /
- acoustic emission parameter
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