Quantitative Approach on Micro-Structure of Cement-Stabilized Organic Matter-Disseminated Sand

In our report, in order to study the influence of the presence of organic matter on the mechanic characteristics of the sand-cement-soil, SEM tests on the organic matter disseminated sand-cement-soil and standard sand-cement-soil under different curing ages（7 d, 14 d, 21 d, 28 d） were performed, and then, Image Pro-Plus software was used to quantitatively analyze the microstructure image of cement-stabilized soil. The results showed that: 1) with the increase of the curing time, the porosity of micro-structure of the organic matter disseminated sand-cement-soil decrease, the degree of cementation increase, however, the degree of cementation of the organic matter disseminated sand-cement-soil（28 d） is worse than that of the organic matter disseminated sand-cement-soil（7 d）; 2) the abundance values of the structural units of the organic matter disseminated sand-cement-soil are about 0.7 mainly, whose ratio are small, however, the hydration reaction of the cement in the 7 d standard sand-cement-soil is relatively complete, and the microstructure tends to be stable; 3) the distribution diagram of the directional angles of the unit cells and pores of the organic matter disseminated sand-cement-soil and standard sand-cement-soil show that the cement soil has no obvious orientation.