三峡工程掺粉煤灰与矿渣微粉混凝土的性能

Properties of Concrete with Fly Ash and Milled Blast Furnace Slag Powder for Three Gorges Project

选择三峡工程使用的原材料,对单掺粉煤灰、单掺矿渣微粉和双掺粉煤灰与矿渣微粉的混凝土性能进行了试验.结果表明,掺入一定量的优质级粉煤灰可以降低混凝土的单位用水量,在水胶比不变的情况下,可减少混凝土的胶凝材料用量,从而降低了混凝土的水化热温升.但是,掺粉煤灰的混凝土早期强度较低.而掺矿渣微粉的混凝土早期强度较高,但降低水化热温升的作用不如粉煤灰.如在混凝土中同时掺优质粉煤灰和矿渣微粉,可使混凝土的各项性能得到改善.

In this paper,the properties of concrete with class I fly ash and milled blast furnace slag powder are studide.The results show that replacing cement by class I fly ash can reduce specific water requirement,and therefore can reduce the cemenuuous material content and temperature rise.But the compressive strength of concrete with fly ash at early ages is lower than that of reference concrete.The com-pressive strength of concrete with milled blast furnace slag powder at early ages is higher than that of concrete with fly ash.At the same time the temperature rise of concrete with milled blast furnace slag powder is higher than that of concrete with fly ash.If the cement is re-placed by both class I fly ash and milled blast furnace slag powder,the excellent properties can be obtained.