5 Conclusions
Bagasse ash added to expansive clayey soil treated with lime has modest effect on the soil strength.
However, the use of bagasse ash has a significant effect on reduction of the shrink-swell capacity of
soil. Based on the study presented in this paper, the following conclusions can be drawn:
x With the increase of bagasse ash (BA)-lime (L) content, the dry density of soil-BA-L mixes
slightly decreased.
x Addition of bagasse ash to expansive soil decreases its swelling, because bagasse ash is non-
plastic material. The free swell ratio (FSR) decreases as percentage of bagasse ash increases. The
use of bagasse ash with lime is more effective than lime only in curtailing the swelling tendency
of soil. Addition of BA-L rapidly increased the unsoaked CBR values for 7 and 28 days. The
effect of BA-L on soil in soaked condition had the similar trend to that of unsoaked condition.
x When the BA-L content increased from 0 to 25%, the unconfined compressive strength increased
by 80%.
x The CBR and UCS values of bagasse ash-lime treated soils are as good as lime treated soils.
However, the soaked CBR results indicated that bagasse ash had the ability to protect the treated