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VOLUME XIV Edisi 1 , April 2009
STABILISASI LEMPUNG KATHMANDU BERKADAR ORGANIK RENDAH DENGAN PENAMBAHAN ADITIF SEMEN, KAPUR DAN FLY ASH |
1) Dosen Tetap Fakultas Teknik UKRIM University, dan Dosen Tamu di Institute of Engineering, Nepal, antara tahun 1993 – 2008 atas pengutusan dari UKRI |
This research describes the results of a series of experiments on the effect of cement, lime and fly ash additives on the compaction characteristics of a fine grained soil with an organic content of 3 % obtained from a construction site at Teku, Kathmandu, the capital of Nepal. Harvard Miniature compaction apparatus was used to determine the compaction characteristics of the soil-additive specimens. Ordinary Portland cement, commercially available quick lime and fly ash, namely pozzocrete, were used as additives. The amounts of cement and lime added to the soil sample as percentage of the dry soil mass were in the range of 3-7 % while fly ash was in the range of 3-28 %. The effect of combined lime - fly ash additives with varying proportions was also studied. The results of the experiments show that in all cases the chemical additives modified the compaction properties of the soil under study to varying degrees, depending on the kind and amount of the additive, despite of its slight organic nature of the soil. The presence of additives reduced the maximum dry unit weight while at the same time increased the optimum moisture content of the untreated soil, shifting the compaction curves to the wet side of optimum. The addition of lime and combined lime:fly ash at 1:3 ratio showed consistent patterns of decreasing maximum dry density and increasing optimum moinsture content with the increase in the amount of additives. On the other hand, the increase in the amount of cement and fly ash alone in the soil did not show consistent patterns of decreasing maximum dry density and increasing optimum moisture content. |
chemical additives, soil |
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