Flexural toughness and damping property of recycled PET plastic aggregate mortar

被引：0
|
作者：
Bao C. [1 ,2 ]
Zhao X. [2 ]
Fan W. [2 ]
Liang C. [1 ,3 ]
Zhan H. [4 ]
机构：
[1] School of Civil Engineering, Shaoxing University, Shaoxing
[2] Zhejiang Jinggong Steel Building CO., LTD., Shaoxing
[3] Department of Structural Engineering, Tongji University, Shanghai
[4] College of Textile and Garment, Shaoxing University, Shaoxing
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 04期
关键词：
damping mechanism; damping ratio; ductility; frequency; interface transition zone; load-deflection curve; recycled PET plastic aggregate mortar; toughness index;
D O I：
10.13801/j.cnki.fhclxb.20220623.002
中图分类号：
学科分类号：
摘要：
In order to study the flexural toughness and damping characteristics of recycled polyethylene terephthalate (PET) plastic aggregate mortar (RPAM), the recycled PET plastic aggregate (RPA) was prepared from the wasted PET plastics. Taking RPA substitution rate as the variable, the three-point bending loading test and the suspension beam bending free vibration test on RPAM were carried out. The load-deflection curve, flexural toughness, first-order damping ratio and frequency of RPAM with different RPA substitution rates were analyzed. Besides, the damping mechanism of RPA interface was analyzed based on the SEM test. The results show that with the increase of RPA substitution rate, the ductility of RPAM increases, the slopes of loading branch and unloading branch of load-deflection curve gradually decrease, and the initial crack strength and flexural strength decrease. The addition of RPA makes the failure of RPAM more ductile, which increases the initial crack deflection and peak deflection significantly. The toughness indexes I5, I10 and I20 are 4.17, 5.65 and 5.89 times larger than that of ordinary mortar, respectively. The residual strength of RPAM increases gradually as the RPA substitution rate increasing. With the increase of RPA substitution rate, the first-order frequency of RPAM decreases by 9.0%-25.9%, while the damping ratio increases by 11.3%-58.1%. The micro structure of interface transition zone (ITZ) between RPA and cement matrix is loose. The slippage and friction of the ITZ and the viscosity of RPA increase the damping energy consumption of RPAM, and the recommended dosage of RPA is in the range of 15.5vol%-17.2vol%. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：2343 / 2354
页数：11
相关论文
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