蒸汽养护条件下水泥-粉煤灰复合胶凝材料的水化性能研究

Hydration characteristics of steam curing cement-fly ash composite binder

通过测定不同龄期净浆的化学结合水量和抗压强度,研究了在蒸汽养护条件下粉煤灰掺量、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:蒸汽养护条件提高了水泥-粉煤灰复合胶凝材料的早期水化速度,并且提高了硬化浆体抗压强度。在蒸汽养护条件下,细度不同的粉煤灰对水泥-粉煤灰复合胶凝材料的化学结合水量影响不大,而超细粉煤灰的密实填充和微集料效应增加了硬化浆体的抗压强度;粉煤灰掺量的增加,降低了水泥-粉煤灰复合胶凝材料的化学结合水量和硬化浆体的抗压强度,但促进了水泥的早期水化。

By testing chemically combined water content and compressive strength of hardened pastes at different ages, the influence of fineness and content of fly ash on hYdration characteristics of cement：fly ash composite under the steam curing condition was studied. The experimental results indicate that steam curing condition increases early hydration velocity of cement- fly ash composite binders and improves compressive strength of hardened pastes. Under steam curing condition, different fineness of fly ash doesn＇t obviously influence chemically combined water of cement-fly ash composite binders, but the dense packing and micro-aggregate effect of ultrafine fly ash improve compressive strength of hardened pastes： the increasing of fly ash decreases chemically combined water of cement-fly ash composite binders and compressive strength of hardened pastes, but facilitates early hydration of cement.