Pumice Stone as Alternative to Flyash for Cement Admixtures and Concrete Composition Using the Same

摘要

The present invention relates to a method for aggressively reusing coal pumice, one of waste resources, and more specifically, to a use of cement admixture from coal pumice, which substitutes fly ash. The present invention provides cement admixture for substituting fly ash in a cement mixture blended with a binder composed of cement and fly ash, wherein the cement admixture for substituting fly ash is coal pumice micropowder which has fineness of 3,000-4,500 cm^2/g and specific gravity of 2.3-2.7 and contains 606 wt% of SiO_2 and 205 wt% of Al_2O_3. In addition, the present invention provides a concrete composition which is a blend of cement admixture derived from coal pumice and a binder composed of cement, and has 1-30 wt% of the cement admixture for substituting fly ash based on the whole weight of the binder.