Abstract
This research was conducted to determine grain size of rice husk ash (RHA) and cement water phase (CWP) beagreeable, so it would be to get result strength and leach rate maximum. The cementation process has be done by mixing liquid waste simulation ware made of strontium nitrate with concentration 65 ppm, type I Portland cement, filler material, rice husk ash and water. Mixture of cement mortar was casted on cylinder with diameter of 28 mm and height of 56 mm. the addition of cement water phase was varied 20^v/_o, 30^v/_o and 40^v/_o of cement volume. Variation of rice husk ash grain size was -40, -100, and -200 mesh as many as 25^v/_o from mixing volume total. After being casted, cement mortars were dried naturally for 28 days. Than the cement mortars were tested with compressive strength test by Universal Testing Machine and analysis of strontium concentration using Atomic Absorption Spectrometer to determine the leach rate after 21 days.
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