PREPARATION OF NANO CALCIUM SILICATE HYDRATE USING SILICA FUME

摘要

The present invention relates to a preparation method of nanosized calcium silicate hydrate (nano C-S-H) from silicon dioxide and, more specifically, to a method of producing nano C-S-H by making a silicate solution produced by using silicon dioxide, especially low purity silica fume which is industrial waste react with a calcium nitrate solution in a dispersing agent solution. According to the present invention, a method can produce uniform C-S-H particles with a size of 100 nm or smaller, and minimize the amount of remaining solid parts with a size of 100 nm or smaller after centrifugal separation, thereby remarkably improving the super short strength of concrete containing the produced C-S-H as a concrete admixture. [Reference numerals] (AA) Non-addition; (BB) Nano C-S-H 0.2% of comparative example 1; (CC) Nano C-S-H 0.2%