THE EFFECT OF ADDITIONAL OF SAGO DREGS ASH ON CBR VALUES IN FINE GRAIN SOIL

Efforts have been made to stabilize clay soils both in terms of stabilizers and soil improvement technologies. Materials for stabilizing clay soils that are currently often used include materials that are still imported and are relatively expensive, lime, fly ash, which used to be waste, currently used for pozzolaning in concrete mixes and soil stabilization, so that the economic value becomes high. In this research, an alternative material for soil stabilization will be sought, namely the use of ash from burning sago fiber dregs originating from sago waste which continues to increase and has not been utilized properly. The tests carried out were: the consistency limits of clay before and after being mixed with the ashes of burning sago dregs fiber. Testing of original soil compaction and stabilized soil, as well as testing of soil bearing capacity tested by California Bearing Ratio (CBR) test. The results showed that: The addition of ash from burning sago dregs has an effect on the characteristics of clay soil. On the addition of 6% bagasse ash, the liquid limit decreased by 31.13% from the original soil condition, the plastic limit decreased by 6.39% from the original soil condition, the plasticity index decreased by 87.842% from the original soil condition, the specific gravity decreased of 4.63% of the original soil conditions, the optimum water content increased by 48.41% of the original soil conditions. The addition of ash from burning sago dregs has an effect on the CBR value of clay soil. The maximum CBR value is achieved by adding 6% of sago dregs combustion ash. The penetration CBR of 0.1 increased by 28.57% and the penetration CBR of 0.2 was 23.83% from the soil condition without the addition of ash burning sago dregs