| Abstract: |
. The aim of this research is to study the effect of new combinations of supplementary cementing materialssilica fume, fly ash, and metakaolin)as a partial replacement of cement on the strength and durability of high performance concrete. Over 31 mixes (650 cubes) were designed, made, tested and compared to the control mix. The experimental program in this research was divided into two parts. The first part was conducted to determine the effect of one, or two, or three additions of SCM (SF, FA, and MK) as a partial replacement of cement weight on the compressive strength of high strength concrete cubes with different dose. The second part was prepared to study the effect of different durations of curing (O(air curing), 7, 14, and 28 days) on the concrete durability such as permeability, chemical attack and fire attack. The compressive strength after the exposure to different durability aspects were measured and considered as indicators for the concrete durability. Results showed that: for one type addition, as a partial replacement of cement weight, the best compressive strength for SF, MK and FA at 10% SF, 10% M.K, and 20% FA was greater than control mix by 42.5%, 33%, and 12.5% respectively at 28 days.
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