Abstract: In earthquake-prone areas, concrete structures are often subjected to cyclic loads. In order to study the compression damage characteristics of recycled aggregate concrete under cyclic loading and unloading, uniaxial compression tests were carried out on concrete specimens with diffe-rent replacement rates of recycled coarse aggregate. Based on acoustics emission(AE) technology, dynamic analysis was made on the damage characteristics of recycled aggregate concrete during the whole process. The results show that:Kaiser effect exists in the acoustic emission ring count of recycled aggregate concrete under cyclic loading, which not only reflects the damage degree of materials, but also reveals the damage mechanism of recycled concrete with different replacement rate,with the increase of stress level, Felicity ratio decrease,Felicity ratio < 1 as a sign of serious damage of concrete;the fractal analysis of each cyclic AE ringing diagram shows that the fractal dimension of recycled concrete AE ringing increases with the increase of the number of cycles under cyclic loading, which proves the feasibility of applying AE in damage prediction. Based on the study of cumulative AE events by using the response ratio theory, it is concluded that AE response ratio Y decreases with the increase of the stress level of the specimen under regenerated concrete loading and unloading, and when the response ratio Y decreases to about 1, it can be regarded as a precursor to the failure of regenerated concrete, providing a reference for engineering damage prediction and safety assessment.
Li W. Experimental study on the effect of recycled coarse aggregate on the mechanical properties of recycled concrete. Master’s Thesis, Hubei University of Technology, China,2019(in Chinese).
李伟.再生粗骨料对再生混凝土力学性能影响的试验研究.硕士学位论文,湖北工业大学,2019.
2
Zhang W D, Dong Y, Peng N B, et al. Journal of Building Material,2020,23(2),292(in Chinese)
张卫东,董云,彭宁波,等.建筑材料学报,2020,23(2),292.
3
Peng X H, Wang S L, Liu K N, et al. Chinese Quarterly of Mechanics,2018,39(2),405(in Chinese).
彭晓辉,王社良,刘康宁,等.力学季刊,2018,39(2),405(in Chinese).
4
Ho N Y, Lee Y P K, Lim W F. Journal of Materials in Civil Enginee-ring,2013,25(3),318.
5
Ismail S, Ramli M. Construction and Building Materials,2013,44(5),464.
6
Liu J H, Xie J, Liu Y J, et al. Journal of Hebei Agricultural University,2019,42(2),127(in Chinese).
刘京红,谢剑,刘永建,等.河北农业大学学报,2019,42(2),127.
7
Liu J H, Yang Y F, Xie J, et al. Transactions of Beijing Institute of Technology,2018,38(12),1231(in Chinese).
刘京红,杨跃飞,谢剑,等.北京理工大学学报,2018,38(12),1231.
8
Chen Z G. Damage identification and deterioration evaluation of RC. Ph.D. Thesis, Zhejiang University, China,2018(in Chinese).
陈忠购.基于声发射技术的钢筋混凝土损伤识别与劣化评价.博士学位论文,浙江大学,2018.
9
Guan X, Qiu J J, Dai J, et al. Journal of Building Material,2019,22(3),459(in Chinese).
关虓,邱继生,戴俊,等.建筑材料学报,2019,22(3),459.
10
Wang X R, Liu X F, Wang E Y, et al. Construction and Building Mate-rials,2017,132,446.
11
Hu S W, Lu J, Xiao F P. Construction and Building Materials,2013,47(47),1249.
Prabhat P, Murthy R, Ramachandra A. Applied Acoustic,2016,117,28.
12
Akichika I, Kimitoshi M, Ninel A, et al. Materials and Structures,2016,49(7),2627.
13
Georg K K, Thomas V. Construction and Building Materials,2010,24(12),2332.
14
Panjsetooni A B, Norazura M, Vakili A H. Scientific World Journal,2013,(10),1155.
15
Ji H G, Li Z D. Journal of Applied Acoustics,1997,16(6),30(in Chinese).
纪洪广,李造鼎.应用声学,1997,16(6),30.
16
Wu S X, Zhang S X, Shen D J. China Civil Engineering Journal,2008(4),31(in Chinese).
吴胜兴,张顺祥,沈德建.土木工程学报,2008(4),31.
17
Zhang H H, Yan Y D, Yu H Z, et al. Chinese Journal of Rock Mechanics and Engineering,2004(21),3621(in Chinese).
张晖辉,颜玉定,余怀忠,等.岩石力学与工程学报,2004(21),3621.
18
Liu J P, Li Y H, Yang Y J. Journal of Northeastern University (Natural Science),2011,32(10),1476(in Chinese).
刘建坡,李元辉,杨宇江.东北大学学报(自然科学版),2011,32(10),1476.
19
Liu J P. Study on precursory characteristics of rock failure based on acoustic emission technique. Master’s Thesis, Northeastern University, China,2008(in Chinese).
刘建坡.基于声发射技术岩石破坏前兆特征实验研究.硕士学位论文,东北大学,2008.
20
Yin X C, Peter M, Peng K Y, et al. Recent Developments in World Seismology,2004(5),24.
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2021, Vol. 35 
