Granite residual soil is a kind of common building material for subgrade in China. However, its stability and durability are not as good as requested by specification. Lime is regarded as an effective modifier for granite residual soil. The influence of lime dosages on stability and durability of granite residual soil are evaluated and its effectiveness is verified and quantified based on lab tests of modulus and strength. It is shown that the performance improvement is obvious. Modified granite residual soil has better support to pavement structure and improves the stability and durability of pavement.
Currently, related specifications provide a wide grading range for cement stabilized aggregate and make it easy to meet. Evaluation of cement stabilized aggregate grading stays in qualitative evaluation: skeleton-void structure, suspension-dense structure, skeleton-dense structure. This paper proposed a new quantitative evaluation index for cement stabilized aggregate gradation. Experiments show that skeleton-dense value has good correlations with physical and mechanical properties. Contrast to CA value proposed by Bailey method, skeleton-dense value shows higher correlation coefficient with physical and mechanical properties.
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