2016 Volume 70 Issue 1 Pages 355-362
This paper shows the effect of ground granulated blast furnace slag and fly ash on freeze-thaw resistance of concrete with blast furnace slag sand. When granulated blast furnace slag sand is used as sand, the high resistance to freezing and thawing action can be expected even if AE agent is not used. Concrete with 50％ of water to cement ratio keeps over 90％ of relative dynamic modulus of elasticity till 300 cycles of freezing and thawing action regardless of period of curing. In the case of using ground granulated blast furnace slag as a part of the binder of the concrete with granulated blast furnace slag sand, by performing sufficient wet curing, the high-resistance to freezing and thawing can be expected same as using just ordinary portland cement. On the other hand, in the case of using a fly ash in a part of the binder of the concrete with granulated blast furnace slag sand, enough resistance to freezing and thawing cannot be obtaining even if cured in water until the age of 91days. In order to exhibit the effect of improving the freeze-thaw resistance by granulated blast furnace slag sand, the selection of a suitable admixture and sufficient wet curing are important.
