Fatigue performance of rubber-modified recycled aggregate concrete (RRAC) for pavement
Fatigue performance of rubber-modified recycled aggregate concrete (RRAC) for pavement
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DOI：
10.1016/j.conbuildmat.2015.07.042
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发表时间：
2015-10-01
影响因子：
7.4
通讯作者：
Li Li-Juan
中科院分区：
文献类型：
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作者：
Liu Feng;Meng Liang-Yu;Li Li-Juan
根据机场道面混凝土的性能要求，研究了废橡胶取代率为10%、20%和30%的橡胶改性再生骨料混凝土的力学性能、疲劳性能和损伤特性。对再生骨料混凝土的抗压强度、四点弯曲强度、弹性模量和疲劳寿命进行了试验研究，结果表明，再生骨料混凝土的抗压强度比普通混凝土（无橡胶、无骨料混凝土）提高了10.1%。随着橡胶粒子含量的增加，RRAC的压缩强度、弯曲强度和弹性模量均下降。而峰值挠度、峰值应变和极限应变在一定范围内随橡胶颗粒含量的增加而增加。当橡胶颗粒含量达到砂的20%时，再生橡胶混凝土的极限应变是不加橡胶的再生橡胶混凝土的3.45倍。基于威布尔理论，对试验结果进行统计分析，给出了不同失效概率下RRAC的双对数疲劳方程，可用于预测RRAC的疲劳极限强度。损伤特性分析表明，再生骨料和橡胶颗粒均能提高混凝土的疲劳寿命。当橡胶颗粒含量达到20%时，这种增强最为显著。(C)2015爱思唯尔有限公司版权所有。
Based on the performance requirements for airport pavement concrete, this study analyzes the mechanical properties, fatigue properties and damage characteristics of rubber-modified recycled aggregate concrete (RRAC) with waste rubber replacement rates of 10%, 20% and 30%. The test results for compressive strength, four-point flexural bending, elasticity modulus and fatigue life on RRAC showed that the compressive strength of recycled aggregate concrete (RAC) increased by 10.1% from that of normal concrete (NC) (rubber-free and recycled-aggregate-free concrete). The compressive strength, flexural strength and elasticity modulus of the RRAC decreased with the increase in rubber particle content. However, the peak deflection, peak strain and ultimate strain increased with the increase of rubber particle content with a certain range. When rubber particle content reached 20% of the sand, the ultimate strain of RRAC was 3.45 times that of rubber-free RAC. Based on the Weibull theory, statistical analysis was performed on the test results, and double logarithm fatigue equations for RRAC under different failure probabilities were provided, which could be used to predict the ultimate fatigue strength of RRAC. An analysis of the damage characteristics showed that both recycled aggregate and rubber particle could enhance the concrete's fatigue life. This enhancement was most significant when the rubber particle content reached 20%. (C) 2015 Elsevier Ltd. All rights reserved.