2023 Volume 77 Issue 1 Pages 96-104
In this study, the effect of triisopropanolamine （TIPA） on the development of initial strength, the stability of long-term strength and the behavior of hydration products of ordinary Portland cement （N） or moderate-heat Portland cement （M） or low-heat Portland cement （L） containing limestone powder （LSP） were investigated. The addition of TIPA to N containing LSP increased the amount of hydrate at 7days and improved compressive strength as the hydration products filled voids. On the other hand, the addition of TIPA to M or L containing LSP did not increase the amount of hydration products at 7days. The reason why the amount of hydrate of M or L did not increase by the addition of TIPA at the initial age is that the amount of the amorphous hydration product decreased. For this reason, hydration products did not fill the voids, thus not increasing the compressive strength of M-LSP system or L-LSP system. At 28 and 91days, the addition of TIPA to N, M or L containing LSP increased the amount of hydration products, and the compressive strength was enhanced by filling the voids. And the addition of TIPA also suggested the formation of amorphous aluminate hydrates and a change in the composition of C-S-H.
