content and achieve the peak values at a = 25%. The unit weight and strength gradually decrease with the ash content when a > 25%. For the same combination of cement content and fly ash content, the higher the water content, the lower the unit weight and the strength. The peak unit weight and strength are also found at a = 25% for different cement contents (vide Fig. 4). This charac-teristic is also found for the BA blended cement admixed Bangkok clay for all tested water contents, cement contents, and curing times. To conclude, the optimal ash content is 25%. It is indepen-dent of cement content since the ash content is determined in pro-portion to the cement content.
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