蒸养条件下水泥-粉煤灰复合胶凝材料的水化性能研究

通过测定不同龄期净浆的化学结合水量和抗压强度,并结合SEM,研究在蒸养条件下粉煤灰掺量、细度对水泥-粉煤灰复合胶凝材料水化性能的影响。试验结果表明:蒸养条件提高了水泥粉煤灰复合胶凝材料的水化速度,同时也提高了粉煤灰的活性;蒸养条件下,粉煤灰的细度对水泥粉煤灰复合胶凝材料的早期水化没有显著影响,其后期水化速度随粉煤灰细度的增加而增加;粉煤灰掺量的增加,降低了其早期水化速度,掺入适量的粉煤灰其后期水化程度可以超过纯水泥的水化程度;粉煤灰的掺入有利于水泥的水化,且水泥的水化速度随粉煤灰掺量的增加而增加。

STUDY ON HYDRATION CHARACTERISTICS OF CEMENT PASTES CONTAINING FLY ASH SUBJECTED TO STEAM CURING

By testing chemically combined water and compressive strength of hardened pastes at different ages and SEM,the influence of fineness and content of fly ash on hydration characteristics of cement-fly ash composite binders on steam curing condition was studied.The experimental results indicate that the steam curing condition increases the hydration velocity of cement fly ash composite binders and activates fly ash;on steam curing condition,the fineness of fly ash does not influence the early hydration and the late hydration velocity increases with the rise of fineness of fly ash;the early hydration velocity decreases with the rise of content of fly ash,and the late hydration degree with the suitable content of fly ash is higher than the hydration degree of cement;the addition of fly ash facilitates the hydration of cement and the hydration velocity of cement increases with the rise of content of fly ash.