废旧轮胎橡胶在膨胀土中的应用研究  

A Study on the Application of Waste Tire Rubber in Expansive Soil

作　　者：张峰 Zhang Feng

机构地区：[1]海南大学材料与化工学院

出　　处：《中国轮胎资源综合利用》2018年第2期42-48,共7页China Tire Resources Recycling

摘　　要：目前,美国每年处理大约3.5亿条废轮胎。尽管约有80%的废轮胎能够被回收利用,但估计仍有约3700万条废轮胎需要在垃圾填埋场进行处理。废轮胎橡胶已被用于几种应用中:如高速公路回填、路基和堤防;作为排水、绿化和吸附材料;以及用于能源生产的替代方法。虽然废轮胎橡胶已被用于改变粗粒土的机械性能,但只有有限数量的研究解决了细粒土的稳定问题用橡胶。这些研究都没有测试橡胶与高膨胀粘土的混合物,例如在科罗拉多州和美国其他西部各州广泛遇到的粘土。在这项研究中,评估了添加废轮胎橡胶的小颗粒对来自科罗拉多州的膨胀土壤的膨胀潜力的影响。测定了橡胶、膨胀土和膨胀土-橡胶(ESR)混合物的指标特性和压实参数。进行一维膨胀固结试验以评估使用废轮胎橡胶小颗粒作为机械添加剂来减轻膨胀土的膨胀潜力的可行性。虽然ESR混合物比未经处理的土壤更具可压缩性,但膨胀土中添加橡胶会显着降低溶胀百分比和溶胀压力。Approximately 350 million tires are disposed of annually in the United States. Although markets now exist for about 80% of the US waste tires, it is estimated that about 37 million waste tires still need to be disposed of in landfills. Waste tire rubber has been used in several applications such as highway backfill, subgrade and embankments; as drainage, landscaping, and sorptive matcrials; as well as in alternative methods for energy generation. While waste tire rubber has been used to modify the mechanical properties of coarse-grained soils, .just a limited nmnber of studies have addressed the stabilization of fine-grained soils with rubber. None of these studies have tested mixtures of rubber with highly expansive clays, such as the ones widely encountered in Colorado and other western US states. In this study, the effect of adding small particles of waste tire rubber on the swelling potential of an expansive soil from Colorado was evaluated. The index properties and compaction parameters of the rubber, expansive soil, and expansive soil-rubber （ESR） mixture tested were determined. One-dimensional swell-consolidation tests were pertbnned to assess the feasibility of using small particles of waste tire rubber as a mechanical additive to mitigate the swelling potential of the expansive soil. While the ESR mixture is more compressible than the untreated soil, both the swell percent and the swelling pressure are significantly reduced by the addition of rubber to the expansive soil .

关 键 词：废轮胎橡胶 膨胀土 膨胀潜力 膨胀压力 膨胀 膨胀固结试验 回收利用 有益使用 土壤稳定 

分 类 号：TQ319[化学工程—高聚物工业]