Table 8 gives the results of strength and pozzolanic effect on WICM. Nos. 11-14, 17, and 18 shown in the table appeared to decrease strength and pozzolanic effect with W CM ratio. In general, concrete strength increases with reducing WICM. 3.5. Change of pozzolanic effect with fine aggregate proportion Nos. 1, 4, 17, and 18 shown in Table 8 can be compared to study the change on compressive strength and indices of pozzolanic effect due to sand proportion, which is the ratio of and mass content to total aggregate (sand and stone) mass content. It appears that in order to increase strength