Abstract
A simple method to optimize the level of cement replacement by fly ash in cement—fly‐ash mortar and concrete is proposed. The method is based on flow‐table tests. In this test, for any specific level of flow a decrease in water content of the mix increases the number of drops. The lines representing water content of the mixes and the logarithm of the number of drops are called flow lines. As the replacement of cement by fly ash is increased in any mix, there is a progressive reduction in water requirement to cause some percentage flow. The slopes of the flow lines gradually decrease with increasing fly‐ash content. Normalization water content, w, of the flow lines, with respect to water content corresponding to 25 drops, w25, leads to collapse of the flow lines into a unique line. This establishes a functional relationship between w/w25 and the number of drops. Using this relationship, the flow line of any mix can be predicted if the value of number of drops for any arbitrary water content is known. This procedure reduces the number of trials required to optimize the level of cement replacement by fly ash.
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