Zhou Chonggang, Pei Xingwang, Li Wenlong, Liu Yijun
College of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
Materials (Basel). 2020 Apr 24;13(8):2004. doi: 10.3390/ma13082004.
In this study, recycled aggregate concrete (RAC) modified with polypropylene fiber (PP) and air-entraining agent (AGA) was prepared, and the effects of PP and AGA on the static (compressive strength, Young's modulus, and splitting tensile strength) and dynamic properties (dynamic modulus of elasticity and damping ratio) of RAC were investigated. The experimental results showed that the addition of an AGA and PP had a favorable effect on the damping ratio of the concrete, however, the addition of the AGA had a slightly negative effect on the mechanical performance of the concrete. The AGA and PP contents required to achieve the optimum damping ratio of the concrete with the least reduction in the mechanical performance were 0.02% and 0.10%, respectively. Furthermore, the addition of AGA was more effective than that of PP in improving the damping property of the concrete.
本研究制备了用聚丙烯纤维（PP）和引气剂（AGA）改性的再生骨料混凝土（RAC），并研究了PP和AGA对RAC静态性能（抗压强度、杨氏模量和劈裂抗拉强度）和动态性能（动态弹性模量和阻尼比）的影响。试验结果表明，添加AGA和PP对混凝土的阻尼比有有利影响，然而，添加AGA对混凝土的力学性能有轻微负面影响。在使混凝土力学性能降低最少的情况下达到最佳阻尼比所需的AGA和PP含量分别为0.02%和0.10%。此外，添加AGA在改善混凝土阻尼性能方面比添加PP更有效。
