Soft soil was one of the most widely encountered problems in construction, especially for archipelago countries which most of its area was lowland with a high deposit of soft soil. To overcome this problem, soil stabilization was one of the most widely used as a solution. Soil stabilization in general uses chemical substances that are classified as pozzolan material. Pozzolan material uses its capability to strengthen the cohesion of soil grains. Mostly, pozzolan material consists of silica. Overboulder asbuton and zeolite were examples of natural pozzolan material in Indonesia. Both materials have a high silica content. Thus, the author interested to figure out the mechanical behavior of these two substances as a soil stabilizer. This research was a correlating study to the previous paper with the same author which discusses the overboulder asbuton as a soil stabilizer. Overboulder added to the mix is determined as 15%, with varied zeolite percentages applied to examine the differences. The UCT was conducted according to ASTM D-2166 as a parameter. As the standard remolding method, a standard proctor test was conducted to determine the optimum moisture content and the maximum density of each mix. While the UCT specimens were tested at the certain curing time for each composition. The curing time applied was 0, 7, 14, and 28 days. By this curing period, the effective pozzolanic reaction that occurs for each composition could be determined. The result shows that zeolite addition to overboulder asbuton could increase the soil density and increase its compressive strength. It is indicated that overboulder asbuton and zeolite mix could be a proper alternative as a soil stabilizer. Doi: 10.28991/cej-2021-03091635 Full Text: PDF

No abstract

No abstract

No 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.