This paper present the results of investigation on the use of rice husk ash as a partial substitute for cement in construction.
One hundred and eighty specimens of concrete cubes were cast. 0, 5, 10, 15, and 20% partial replacement of cement with
rice husk ash were carried at 1:2:4 mixes by weight with 0.60, 0.65, 0.70 water/cement ratio. The results indicated that compressive
strengths of cubes at 0.6, water/cement were higher than 0.65 and 0.70. Also 5% partial replacement cement with rice husk ash
at 28th day average compressive strength value of 25.4 N/mm2
compared well with 0% partial replacement of cement with rice husk
ash of 26.28 N/mm2
. This shows that at 5% partial replacement of cement with rice husk ash can be used for structural concrete
and at 15% replacement or more it can be used for non - structural construction works or light weight concrete construction. The
cost analysis shows substantial amount of savings for the country.