Experimental Study on Using Marine Silt as Subgrade Filler
The dumping of marine silt occupies a lot of land resources and poses high risk of secondary pollution.The single-factor test of the sediment in Ouhai found that a single cementitious material was not effective in curing the sediment in Ouhai,while the mixture test model showed that the 7-d unconfined compressive strength of the cured soil could reach 2.12 MPa under the conditions of cement∶slag∶gypsum=6.2％∶1.8％∶2.0％,which was close to the actual test result of 2.36 MPa.The liquid-plastic limit,compaction performance and CBR of the cured soil under the best mix proportion were significantly increased,and the performance of the road constructed with such cured soil was superior to that constructed with conventional cement-stabilized soil,and the sediment in Ouhai changed from a source of mild pollution to a safe and reliable substance after composite curing.The microscopic analysis indicated that pores between silt microparticles that had undergone composite curing were significantly reduced,which further demonstrates the potential cause for the improved performance of the composite cured soil.Preparing the roadbed fill with marine silt consumes a lot of sediment,producing significant economic and environmental benefits.This test provides reference for the use of marine silt in road construction.
万方数据
维普
