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

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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.

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Abu sekam padi merupakan bahan yang banyak tertimbun dan cenderung menjadi sampah karena pemanfaatannya yang masih sedikit / relatif kecil, sehingga perlu ditangani secara serius.Selain itu, dewasa ini abu sekam padi hanya dimanfaatkan untuk sebagian kecil kebutuhan saja. Misalnya sebagai bahan abu gosok. Tujuan penelitian adalah untuk mengetahui kuat uji tekan dan penyerapan air pada paving block yang  menggunakan aggregat halus dari Kecamatan Batauga Kabupaten Buton dan abu sekam padi dari Kelurahan Ngkari-kari Kecamatan Bungi Kota Baubau  sebagai bahan tambah yang digunakan dalam pembuatan paving block pada umur 7,14 dan 28 hari.  Pengujian yang dilakukan di Laboratorium Teknik Sipil Universitas Dayanu Ikhsanuddin Bauabau meliputi : berat jenis, berat satuan, kadar air dan gradasi serta  uji tekan dan penyerapan air Dari hasil pengujian karakteristik kuat tekan dengan penambahan abu sekam padi maka, klasifikasi untuk paving block ini masih memenuhi persyaratan mutu SNI untuk standart kuat tekan 100 kg/cm2, sesuai dengan peruntukannya bagi taman kota dan pejalan kaki. Serta serapan air paving block dengan penambahan 5-10% abu sekam padi tidak dapat mengurangi penyerapan air paving normal (tanpa penambahan abu sekam padi). Penyerapan air paving block yang dihasilkan dengan menggunakan bahan tambah abu sekam padi sampai 10% dari berat semen rata-rata sebesar 10,04% tergolong dalam mutu IV (Taman Kota) sesuai SNI-03-0691-1996 dengan batas bawah penyerapan air sebesar 10%.