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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.
The properties of single mixed fly ash, single mixed slag and double mixed fly ash and slag powder were tested with the raw materials used in the Three Gorges Project.The results show that mixing a certain amount of high quality fly ash can reduce the concrete Of the unit of water, in the case of the same water-cement ratio, can reduce the amount of cementitious material used in concrete, thereby reducing the heat of hydration heat of concrete.However, the early strength of concrete mixed with fly ash is low. The early strength of concrete with slag powder is higher, but the effect of reducing the temperature rise of hydration heat is not as good as that of fly ash, and if mixed with fine fly ash and slag powder in concrete, the properties of concrete can be improved.