The rice husk ash (RHA) is high reactive amorphous silica, which is a suitable raw material for making pozzolanas. The outcomes of this study provide insight into engineering behaviour of open field-burnt rice husk ash mixed expansive soil from Yogyakarta, Indonesia. A series of laboratory tests has been performed subject to engineering properties such as indices properties, bearing of soil and shear strength properties. The experiment confirmed the ashes-lime mixtures diminished moderately the plasticity index of tested soil from 42 percent to 5 percent by blending of 6 percent lime and 13 percent RHA. Although decreased in dry density, the bearing of soils (California Bearing Ratio) value increases steeply from 3 percent to 16.3 per cent at a 6 percent lime to 13 percent ash mixture. In association with the increase in CBR, the shear strength is also increased. All of these factors can be summarized to say that ashes enhance the engineering properties of lime-treated soils. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E208431.
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