2022 Volume 76 Issue 1 Pages 19-27
In order to understand the molecule structure-activity relationship of the admixture to the hydration reaction of C4AF, the complexation ability of the admixture with metal ions and the leaching degree of Fe and Al from C4AF were evaluated. As a result, we found a relationship between the complexing ability and the degree of elution and the type, number, and bonding distance of the functional groups of the admixture. The stability of the complexes of Fe3＋ with admixtures was investigated by quantum chemical calculations, which led to the proposal of a suitable compound for dissolving Fe gel that inhibits the reaction of C4AF. Based on these results, the effects of five admixtures on the hydration reaction of C4AF and cement were investigated. The admixture that increased the leaching of Fe and Al promoted the reaction of C4AF, and in addition, the admixture that did not delay the reaction of C3S was confirmed to enhance the compressive strength.
