PENGARUH PENAMBAHAN BOTTOM ASH TERHADAP TANAH CLAY UNTUK MENAIKAN KUAT TEKAN BEBAS

Abstract

Soil is a material that is very influential in planning the construction of buildings, roads and bridges. So in construction design it is necessary to pay attention to the nature and bearing capacity of the soil where the construction will be built. One type of clay soil, which can also be called clay soil, often causes problems. This type of clay soil is also found in the Palangka Raya City area, with low soil bearing capacity and causing damage to road structures and buildings, so a way to improve this type of soil is needed, one of which is stabilization. Bottom Ash is a coarse, granular and non-combustible by-product collected from the bottom of a furnace that burns coal to produce steam, producing electrical power. It can be used as a construction filler, aggregate for concrete and masonry blocks, as a substitute for sand for traction on highways. In this research, we will look at the efficiency of the Bottom Ash mixture to obtain the unconfined compressive strength value. This type of research is the development of experimental research, where this research is carried out in this research laboratory through several stages of testing, namely: Sieve Analysis, soil specific gravity test, Atterberg limit test (Liquid Limit and Plastic Limit tests) to obtain the Plasticity Index. Standard soil compaction test using the Proctor Test to obtain optimum water content and optimum density. Unconfined compressive strength test to obtain the unconfined compressive strength value. From the sieve analysis test, specific gravity, atterbeg limit and CBR value, including clay soil which requires improvement in the mechanical properties of the soil with the addition of additive materials. Free compressive strength of soil mixture with the addition of Buttom Ash carried out in the PT laboratory. Karya Halim Sampoerna, Palangka Raya, from samples that have been tested for Buttom Ash and clay, namely with a mixture of 0%, 6%, 8%, 10%, in the 0% mixture the average compressive strength value is 53.44 kg/cm², the 6% mixture has an average of 63.71 kg/cm², the 8% mixture has an average of 94.54 kg/cm², the largest compressive strength value is produced when in soil conditions with 10% bottom ash with an average compressive strength value of 121.26 kg/cm², due to the nature of bottom ash which can absorb water and the mixing of the soil causes the soil sample to be tested to become stiff.
Keywords: Clay Soil, Bottom Ash, Free Compressive Strength, Stabilization, Density