The modulus of elasticity (E50) is the important parameter used for settlement calculation process. The results presented E50 for all stabilized soil mixtures increased with curing time and CBA0 had the highest E50 of all the mixtures at the early stage of 7 days. At 14 days, CBA10 and CBA20 showed that the higher E50 than CBA0 and other mixture. At 28 days of curing, CBA20 exhibited yield E50 while CBA50 showed the lowest value. This result have similar trend to the strength development curve and relationship between UCS and E50 as shown in Fig. 3.