废弃轮胎橡胶颗粒混合土无侧限抗压强度试验研究

Test on unconfined compressive strength of lightweight soil mixed with rubber chips of scrap tires

为了分析废弃轮胎橡胶颗粒混合土(RST混合土)的工程特性,采用无侧限抗压强度试验对RST混合土的无侧限抗压强度进行研究。首先,对组成RST混合土的原材料的物理特性进行分析,然后,进行RST混合土试样的配比方案设计和制备方法研究,进而采用无侧限抗压强度试验,研究养护龄期、胶粒土比、灰土比以及水土比对RST混合土无侧限抗压强度的影响规律。研究结果表明:在28 d的养护龄期内,RST混合土的无侧限抗压强度随养护龄期的延长而增大,且灰土比约为10%的RST混合土试样的无侧限抗压强度对养护龄期尤为敏感;RST混合土的无侧限抗压强度还随胶粒土比的增大而减小,随灰土比的增大而增大;RST混合土无侧限抗压强度对应的最优水土比约为25%。

In order to analyze the engineering characteristics of lightweight soil mixed with rubber chips of scrap tires（RST mixed soil）, the unconfined compressive strength tests were carried out. Firstly, physical properties of the ingredient materials in RST mixed soil were studied. Then, the mixture ratio scheme and the preparation method of RST mixed soil samples were designed. Furthermore, influence laws of curing age, rubber-soil ratio, cement-soil ratio and water-soil ratio on the unconfined compressive strength of RST mixed soil samples were studied through unconfined compression tests. The results show that the unconfined compressive strength of RST mixed soil increases with the prolonging of curing age during the curing period of 28 d. When the cement-soil ratio is about 10%, the unconfined compressive strength of RST mixed soil is more sensitive to curing age. In addition, the unconfined compressive strength of RST mixed soil decreases with the increase of rubber-soil ratio, while it increases with the increase of cement-soil ratio. The optimal water-soil ratio of RST mixed soil corresponding to the unconfined compressive strength is about 25%.