将废旧汽车轮胎经过处理后得到的橡胶块和橡胶颗粒分别取代部分细集料配制成橡胶集料混凝土(简称CRC),考虑标准养护和自然养护2种条件,采用ASTM C1202法对不同橡胶掺量(最高掺量为细集料体积的55%)的CRC进行抗氯离子侵蚀试验研究。结果表明:与普通混凝土相比,CRC的抗氯离子侵蚀能力在许多情况下有不同程度的提高;标养条件下,B组(橡胶颗粒)CRC抵抗氯离子侵蚀的性能优于A组(橡胶块)CRC。此外,基于现有混凝土氯离子扩散模型对CRC结构在氯离子环境下的使用寿命进行了理论评估。

Research on Chloride Ion Permeability and Service Life Evaluation of Crumb Rubber ConcreteOU Xing-jin1,ZHU Han1,YU Xin-wen2(1.School of Civil Engineering,Tianjin University,Tianjin 300072,China;2.Tianjin Research Institute of Building Sciences,Tianjin 300193,China)Crumb rubber concrete(CRC) was made by replacing a portion of fine aggregates with shredded worn-out automobile tire particles or chips in Portland cement concrete.In this study,the chloride ion penetration in CRC with different rubber amount up to 55% in volume of fine aggregates was investigated under standard curing condition and natural curing condition by following the ASTM C1202 method.Test results showed that the resistance of CRC to chloride ion penetration had improvement compared with ordinary concrete in many cases;the performance of CRC with rubber particles was better than CRC with rubber chips under standard curing condition.Furthermore,the service life of CRC structures in chloride environment was evaluated theoretically by adopting the chloride diffusion model in concrete.concrete;crumb rubber;chloride ion;penetration;service life;evaluation