Characteristics study of over boulder asbuton as pozzolanic material for soft soil stabilization

Abstract

Over Boulder Asbuton is a natural asphalt from Buton Island which is a layer of topsoil with a large deposit that can be used as a road material because besides containing bitumen, the mineral also has lime (CaCO3) which is quite high up to 80% with its mineralogy content containing Calcium amounting to 79.64% and silica element at 9.63% so that the mineral composition contains positive ions and can be said to be pozzolanic material, which can function as a stabilizing material on soft soil. Therefore, in this study utilizing these minerals as an alternative to soil stabilization ingredients. The purpose of this study was to evaluate the Asbuton Over Boulder characteristics as a stabilization material through laboratory tests so that the proportion and variation of Asbuton Over Boulder minerals were obtained to increase the bearing capacity on expansive soils. Over Boulder Asbuton was taken at the location of the Kabungka, Lawale, and Sampolawa blocks, then the preparation of the material was carried out in the laboratory, namely by drying in the open air until it reached air dry. The specimens used were cylindrical in H = 2D size, from the Asbuton Over Boulder mineral test results, the qu max value was obtained at 21 days curing time = 0.624kg / cm3, in the Proctor optimum moisture content. The value of California Bearing Ratio (CBR-Unsoaked) was 12.06% and the value of California Bearing Ratio (CBR-Soaked) obtained was 8.04%. So from the results obtained, that the utilization of Asbuton Over Boulder greatly affects the stability of the soil that will be used as a construction material.