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Influence of Rice Husk Ash and Lime on Engineering Properties of a Clayey Subgrade by Department of Civil Engineering, Muhammadiyah University of Yogyakarta, Indonesia and Gendut Hantoro Road Engineer, Department of Civil Engineering, Muhammadiyah University of Yogyakarta, Indonesia Submit Discussion |
Abstract
When geotechnical engineers are faced with clayey soils, the engineering properties of those soils may need to be improved to make them suitable for construction. Waste materials such as fly ash or pozzolanic materials have been used for soil improvement. Recent research, based on pozzolanic activity, found that rice husk ash was a potential material to be utilized for soil improvement.
The effects of the engineering properties of clayey soils when blended with lime and rice husk ash are the focus of this paper. A series of laboratory experiments have been implemented. Varieties of samples were made by blending both rice husk ash and lime together. These samples were 2%, 4%, 6%, 8%, 10% and 12% for lime and 7.5%, 10% and 12.5% for rice husk ash.
The results from the LHRA (lime-rice husk ash) blend confirmed that the blend would diminish swell behavior of clayey soils. Their PI (plasticity index) would decrease from 41.25% to 0.96% when subjected to a LHRA blend of 12-12.5%. Their swell potential would decrease from 19.23% to 0.019% when subjected to the same blending as well. Their CBR (California Bearing Ratio) value would increase from 3.03% to 16.3% at a LHRA blend of 6-12.5%. Their internal friction angle concerning shear strength parameters would enhance from 5.36 to 23.85. Soil cohesion increased as well from 54.32 kN/m2 to 157.19 kN/m2. Increasing the shear parameter caused bearing capacity to be 4131 kN/m2 from 391.12 kN/m2. At LHRA 6-10%, consolidation settlement was lowered from 0.03 to 0.006. All of these factors can be summarized to say that by blending lime-rice husk ash together, you may enhance the engineering properties of clayey soils. This is advantageous for work construction in the civil engineering field.
Keywords:KEYWORDS: engineering properties, lime-rice husk ash, clay
