Effect of Fly Ash on the Workability of Nondispersible Underwater Concrete
Effects of fly ash on the slump, slump loss with time, dispersibility and strength of nondispersible underwater concrete (NDC) were analyzed. The results show that fly ash can increase the fluidity of fresh DNC and reduce the loss of fluidity, but may be disadvantage for improving turbidity, especially fly ash more than certain range. The reinforcement of fly ash takes place at later ages and the amount of fly ash added which has little effect on later strength continues to be increased with ages. The results of field tests also indicate that NDC with 30% fly ash has very small sump loss and good antidispersibility and meets the requirements of compressive strength.
Jianmin Zeng, Taosen Li, Shaojian Ma, Zhengyi Jiang and Daoguo Yang
J. S. Niu and X. W. Ma, "Effect of Fly Ash on the Workability of Nondispersible Underwater Concrete", Advanced Materials Research, Vols. 194-196, pp. 942-946, 2011