Influence Analysis of Different Modified Materials on the Subgrade Filling Performance
In order to improve the mechanical properties and deformation stability of highway subgrade fillers,the effects of cement,lime,rice husk ash,fly ash and nanomaterials on the performance of subgrade filling were studied.Based on the improved methods of Prokett,Atterberg limit,free expansion rate,California Bearing Ratio,resilience modulus and SEM microscopic scanning electron mi-croscopy analysis,etc.The influence of different modified materials on the deformation process of clay subgrade filling is analyzed.The results showed that:(1)On the basis of effectively reducing the soil plasticity and swelling rate,the optimal additive content(mass rati-o)was as follows:fly ash content was 6%,rice husk ash content was 15%,lime activator content was 6%,nanomaterials and cement content was 6%.(2)Under the above ratio conditions,compared with ordinary soil,the plasticity,free expansion rate and optimal water content of the modified material are relatively reduced,but the maximum dry density,unconfined compressive strength,California Bear-ing Ratio and resilience modulus show an increasing trend.(3)According to SEM analysis and determination,particle flocculation and agglomeration occurred in the soil microstructure under the test condition of adding 15%rice husk ash+6%lime,and the strengthe-ning and stability performance of the soil sample was significantly better than that of the control soil sample.
cement roadbedclaylimerice husk ashmodulus of rebound
NETL
NSTL
万方数据
