低水胶比粉煤灰混凝土强度与断裂性能

Study on Strength and Fracture of Fly Ash Concrete with Lower Water Cementing Material Ratio

用Ⅱ级粉煤灰与 Ｓ Ｎ－ Ⅱ型高效减水剂复合， 配制了水胶比在 ０．３～０．４ 范围、粉煤灰最大取代水泥量为５０％ 的粉煤灰混凝土， 系统研究了其强度、断裂与变形性能， 通过与高水胶比粉煤灰混凝土的对比， 得到了在低水胶比情况下， 粉煤灰的掺入量、水胶比及水泥品种等因素对粉煤灰混凝土力学性能的影响规律， 并结合微观测试对其内在机理进行了分析。

The Ⅱgrade fly ash and type SN Ⅱ high effective admixture are used to produce the fly ash concrete, with water cementing material ratio between 0.3 and 0.4 and 50% maximum cement replacement. The strength and fracture and changing shape are studied systemly. Compared with the performance of fly ash concrete with higher wster cementing material ratio, the influces of the fly ash content, water cementing material ratio and cement type on the mechinical feature of fly ash concret are obtained under the condition of lower water cementing material ratio. Based on the SEM test of microstructure, the mechanism is analyzed.\;