环保型盾构渣土路面基层材料应用试验研究

Research on Application of Environment-friendly Shield Residue Road Base Material

以南京地区盾构渣土为研究对象,用自主研制的固化剂固化盾构渣土,通过击实试验、抗压强度试验、抗压回弹模量试验、干缩试验、冻融循环试验等一系列试验,探索固化盾构渣土用作路面基层材料的可行性。研究结果表明,固化剂的掺入会大幅改良盾构渣土的工程特性,当固化剂掺量分别为8%、12%、15%时,各土体的最优含水率分别为17%、18.4%、19.1%,最大干密度分别为1.77g/cm3、1.69g/cm3、1.64g/cm3;通过分别添加固化剂和水泥的盾构渣土对照试验发现,固化剂固化渣土的土体力学性能、干缩特性和抗冻融性能均明显优于水泥固化土,固化剂掺量越高,路用性能越好。研究成果可进一步推进盾构渣土在道路工程中的资源化利用,用作路面基层材料比用作路基填料经济效益更为显著。

Taking shield residue in Nanjing area as the research object,the shield residue is solidified with self-developed curing agent,and the feasibility of solidifying shield residue as pavement base material is explored through a series of tests including compaction test,compressive strength test,compressive resilience modulus test,dry shrinkage test and freeze-thaw cycle test.The results show that the addition of curing agent could greatly improve the engineering characteristics of shield residue.When the curing agent content is 8%,12%,and 15%,the optimal water content of each soil is 17%,18.4%,19.1%,and the maximum dry density is 1.77 g/cm',1.69 g/cm°,1.64 g/cm°,respectively.It is found that the mechanical properties,dry shrinkage properties and freeze-thaw resistance of the shield residue solidified by the curing agent are obviously better than those of the cement solidified soil.The higher the curing agent content is,the better the road performance is.The research results can further promote the resource utilization of shield residue in road engineering,and the economic benefits of using as road base material are more significant than that of using as subgrade filler.