Abstract
Cement kiln dust, a waste material in the cement industry, contains partially processed raw materials. This paper reports an investigation into its usage in concrete as a partial replacement for cement. The percentages of cement replacement by weight were 0, 25, 50, 75 and 100 in cement paste and 0, 15, 25, 35 and 45 in both 1:1.5:3 and 1:2:4 concretes. The results showed that the kiln dust is a cementitious material and it causes the following effects when used as cement replacement: 1.1. retards the setting of cement;2.2. increases the water demand for a constant consistency; and3.3. decreases the concrete strength.For the same workability concrete, cement can be replaced by up to 15 per cent with cement kiln dust without causing significant strength loss.
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