Study on the dynamic characteristics of composite modified aeolian sand roadbed soil with cement and SH curing agent
To explore the dynamic characteristics of composite modified desert aeolian sand with ce-ment and SH curing agent,cement and SH curing agent are taken as materials and the optimal mois-ture content as a constant value to study the effects of composite curing material content on the ex-perimental soil.A total of 26 group of specimens are prepared,with 3 samples in each group.The consolidated undrained vibration triaxial test and nuclear magnetic resonance(NMR)test are con-ducted to analyze the composite curing mechanism and mechanical properties of the two materials.The microscopic pore variations of specimen are revealed by using NMR test after adding SH curing agent to evaluate the improvement effects of the curing agent.The results show that:(1)The effect of single addition of cement is worse than that of two curing materials.The combination of two materials can play a better curing effect when the solidified soil has a more stable internal structure.(2)The curing effect of 11%cement and 0.5%SH curing agent is the best under all working conditions.(3)The stress-strain curve of the soil after single addition of cement shows a strain softening type,while the stress-strain curve shows a strain hardening type after adding SH curing agent.The re-search results can provide theoretical basis for highway construction in desert areas.
aeolian sandcementSH curing agentnuclear magnetic resonance(NMR)roadbed project
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