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采用RILEM推荐的楔形劈裂试验方法,分别对经历不同冻融循环下水灰比为0.4和0.5的普通混凝土试块以及水灰比为0.5的单掺粉煤灰和复掺粉煤灰与硅灰的混凝土试块,进行28 d标准养护之后,对其进行楔形劈裂试验,并测量其抗压强度及相对动弹性模量。试验结果表明,在28 d标准养护条件下,水灰比越大混凝土的抗冻性表现越差,断裂能,韧性及抗压强度都明显低于水灰比小的混凝土;掺加粉煤灰的混凝土试块抗冻性低于普通混凝土但是抗裂性能以及韧性都明显强于同等水灰比下的普通混凝土试块,双掺粉煤灰和硅灰的混凝土试块的无论是抗冻性能还是抗裂性能、强度以及韧性都明显高于普通混凝土试块和单掺粉煤灰的试块。
According to the wedge splitting test method recommended by RILEM, the effects of different concrete blocks with water-cement ratio of 0.4 and 0.5 under different freeze-thaw cycles, single-mixed fly ash with water-cement ratio of 0.5, After 28 days of standard curing, the wedge splitting test was carried out and the compressive strength and relative dynamic elastic modulus of the concrete specimens were measured. The results show that under the standard curing conditions of 28 d, the higher the water-cement ratio, the worse the frost resistance performance, the lower the fracture energy, the toughness and the compressive strength of the concrete. The fly ash Of the concrete block frost resistance lower than ordinary concrete, but the crack resistance and toughness were significantly stronger than the same water-cement ratio ordinary concrete test block, double mixed with fly ash and silica fume concrete block either frost resistance Or crack resistance, strength and toughness were significantly higher than ordinary concrete blocks and single mixed fly ash test block.