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The strength-effect of fly ash

LONG Guang-cheng~1, XIE You-jun~1, WANG Pei-ming~2(1.School of Civil Engineering and Architecture, Central South University, Changsha 410075, China;2.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China)  
The strength-effects of fly ash(FA) in mortar and concrete are studied by two parameters of strength-effect index and strengthening factor. The influences of the amount of fly ash in system and water to binder ratio(w/b) on strength-effect is analyzed in detail. Results indicate that the strength-effect of fly ash in mortar system is different from that of concrete. The strength-effect of fly ash varies with the amount of fly ash and w/b. In concrete system, there are two different optimal w/b to make strength-effect index and strengthening factor of fly ash maximum, and an optimum amount of fly ash for optimal unit strength-effect index.
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