earticle

영어

Recently, the use of fly-ash as a part of cement content in concrete is very common. But, it has been indicated that the compressive strength of concrete using large amount of fly-ash as a part of cement content in early age is low and carbonation velocity is fast. Thus, the purpose of this study is to suggest a reference for a design of mix proportion of mortar using fly-ash
with the physical properties found from a test performed: a test adding sodium sulfate to mortar proved that the early strength of mortar is increased.
In this study, the strength development property when micro grinding fly-ash fineness 4000,6000㎠/g was used, the problem of the early strength decline when fly-ash is added, and strength increasing effect and physical change using sodium sulfate as pozzolan stimulator for strength of age 28day increase are examined.