Typical XRD patterns of the stabilized soils for CBA0 and CBA20 at 28 days curing time from Figure 10, showed growths of major reaction products which could be identified as CSH and ettringite. As obviously seen in Figures 11 and 13, X-ray intensities of CSH products and ettringite for CBA0 and CBA20 illustrated their formations similar to strength characteristic curves. In addition, the developed strength exhibited general trend to increase proportionally with amounts of CSH and ettringite. This can be observed as shown in Figure 12 and Figure 14. In essence, the higher reflections were obtained from the mixtures having relatively higher strength. It could therefore be concluded that these reaction products mainly contribute to strength development of the stabilized soils.