The strength development in relation to
RHA replacement is shown in Figure 4. At 3 d, the
stabilized soil strength decreased with increased
RHA substitution content. However at 7, 14 and 28 d, the soil strength with an RHA substitution
content of 10%, 20% and 30% was higher than
for SCM00 with only OPC content. In addition,
SCM40, which contained 40% RHA replacement,
produced the lowest strength of all mixtures with
curing time. There was a similar trend in the
relationship between E50 and the RHA replacement
content as shown in Figure 5. Based on the strength
characteristic results and economics, using 30%
RHA for partial replacement of OPC is suggested
as the optimum content for soil stabilizer.