The damping property of recycled aggregate concrete
The damping property of recycled aggregate concrete
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再生骨料混凝土的阻尼性能
DOI：
10.1016/j.conbuildmat.2015.11.026
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发表时间：
2016-01-15
影响因子：
7.4
通讯作者：
Yang, Qiuwei
中科院分区：
文献类型：
--
作者：
Liang, Chaofeng;Liu, Tiejun;Yang, Qiuwei
阻尼特性是材料固有的动态特性之一。目前，对再生骨料混凝土阻尼性能的公开研究非常有限。研究了再生粗骨料（RCA）取代率和粒径对再生粗骨料阻尼性能的影响。通过梁的三点动态弯曲试验和自由振动阻尼试验，研究了再生混凝土在弹性阶段的损耗角正切和再生混凝土悬臂梁在非弹性阶段的阻尼比。结果表明，无论是替代率的增加或RCA尺寸的减小导致的损耗角正切和阻尼比的增加。与天然骨料混凝土（NAC）相比，再生骨料混凝土阻尼性能的改善可能是由新旧界面过渡区之间的滑动、微裂纹的扩展、微裂纹和宏观裂纹内的摩擦、旧砂浆中空隙中空气的压缩和膨胀等因素引起的。结果表明，取代率和RCA尺寸对RAC的阻尼性能有显著影响。(C)2015爱思唯尔有限公司版权所有。
Damping property is one of the intrinsic dynamic characteristics of a material. Currently, open studies on the damping property of recycled aggregate concrete (RAC) are very limited. This paper investigates the effect of replacement percentage and size of recycled coarse aggregate (RCA) on the damping property of RAC. Three-point dynamic bending test of beams and free vibration damping test were respectively conducted to study the loss tangent of RAC in elastic stage and the damping ratio of a RAC cantilever beam in inelastic stage. The results show that either an increase in replacement ratio or a decrease in RCA size leads to an increase in the loss tangent and damping ratio. Compared with natural aggregate concrete (NAC), the improvement in damping property of RAC may be induced by a number of factors such as the sliding among the old and new interfacial transition zones (ITZs), the propagation of micro-cracks, the friction within micro-cracks and macro-cracks, the compression and expansion of air in voids existed in old mortar. It is concluded that the replacement percentage and the RCA size have a significant influence on the damping property of RAC. (C) 2015 Elsevier Ltd. All rights reserved.