The compressive strength developments of samples of treated soil for different curing times as shown in Fig. 2 indicated that the UCS for all mixtures increased with time. At the early stage 3 and 7 days, The compressive strength decreases with an increase in the BA replacement content. The compressive strengths of mixes containing BA are lower than that of the control strength of CBA0 (only OPC content). At 14 days, CBA10 and CBA20 had compressive strengths of 995 and 1074 kPa, respectively showed the higher strength than CBA0 and other mixture. At 28 days of curing, CBA20 produced the highest compressive strength whereas the CBA50 sample had the lowest. In addition, CBA50 present the lowest strength for all of curing period. The proposed equations for strength prediction with curing time had high coefficients of determination and are presented in Table 2.