Abstract: This paper described indoor physical and mechanical test for kaolinite mineral weathered sandy soil from Yushan county in Jiangxi province. The XRay Diffractomer (XRD) test showed that mineral composition of sandy soil is mainly composed by montmorillonite mineral, content of 35%. The Xray Fluorescence Spectrometer (XRF) test got the composition and content of elements of the sandy soil, including the content of aluminum in around 11%. In order to compare the quicksetting effect of the sand silt group with accelerator, mixed mortar test M10 grades were carried out. Test results show that the average of 7 d compressive strength of mixed mortar test block mixed with sandy soil fine group as plaster was higher than that mixed with accelerator when sandy soil and accelerator at the same proportion of gelatinous material. But the strength of the mortar was reduced when the cement ratio of sand soil increased. This illustrated that sandy soil can't completely replace cement as mortar gelatinous material, and the proportion should be considered according to the mixed mortar strength grade.

Key words: Weathered Sandy soil, Montmorillonite, Accelerator, Composite Mortar, Compressive Strength