Peat soil is a soft soil with more than 75% organic content, very high void ratio, and very high water content. In recent times, the lack of land use has made peat soil as an option for agriculture, drainage channels, and also for construction. Utilization of peat soil usually causes the peat soil water content to decrease. Based on the condition of its water content, the condition of peat soil can be classified into several conditions, which is peat soil with constant water content, peat soil which affected by ambient water content, and dried peat soil. Some of the improvement efforts made include the method of improvement by means of stabilization. The stabilization material used was a mixture of lime (CaCO3) and rice husk ash with the combination of 70% rice husk ash and 30% lime. Based on those studies, the use of the stabilization method is not recommended if the peat soil water content has decreased more than 50%. Therefore, the peat soil water content needs to be maintained in order for the stabilization to be effective and also for the sake of environmental preservation.

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One of the traditional substructure forms of Borneo is the kacapuri foundation. Previous research conducted a study on this kacapuri foundation by making an alternative kacapuri foundation model by combining a raft of gelam wood with reinforced concrete pillars. The study was originally applied to peat soil, but in reality, the kacapuri foundation was applied to alluvial soils around riverbanks rather than on peatlands. Therefore, this study looks at how the behavior of bearing capacity of the foundation when it is applied on alluvial soil. The location of the study where is located in the traditional Dayak Ngaju tribe in Mandomai village, Central Kalimantan. As a reference the application of the form of foundation using the model of Dayak house Huma Hai in the form of a house on stage with the main material of ironwood. The burden of each column of the house is 9,93 kN in the middle pole position. From the research, it is found that the ultimate bearing capacity is 298 kN /m2, with its own weight is 4,816 kN.

Composite is a system composed by mixing two or more different materials, in the form and composition of materials that do not dissolve each other. In general, the composite material is a material that has some properties that may not be owned by each component. This study aims to determine the effect of immersion banana fiber in NaOH solution, the composition ratio of the difference between the banana fiber to resin used and find the resistance of composite products produced against the pressure test and tensile test. This study begins with taking fiber banana followed by delignification process to remove lignin in the raw material, then molding composites made with a composition that has been set. The resulting composite will be tested durability to perform pressure tests (ASTM D 695) and a tensile test (ASTM D 638). To test tap on the position of the randomized to the concentration of NaOH 0%, 3%, 5% and 7% respectively, each for 53.716 N/mm 2, 43.184 N/mm 2, 81.724 N/mm 2 and 30.032 N/mm 2. For tensile test on an randomized position with NaOH concentration of 0%, 3%, 5% and 7% respectively, each for 21.519 M.Pa, 18.359 M.Pa, 31.033 M.Pa and 21.064 M.Pa.