本文采用三点弯曲约定的试验条件,进行高粉煤灰掺量碾压混凝土的断裂韧性试验,试验研究表明,在原材料及试验条件都相同的条件下,水胶比是影响K_(1c)的重要因素。本文引用了徐华荣高级工程师对常态混凝土断裂韧性的试验成果,并与高粉煤灰掺量碾压混凝土的K_(1c)进行对比,结果表明,在抗压强度相同的条件下,高粉煤灰掺量碾压混凝土的K_(1c)比常态混凝土K_(1c)略大,并作了微观结构分析。 In this paper, the fracture toughness test of high fly ash content roller compacted concrete is carried out using the experimental conditions of the three-point bending convention. The experimental study shows that under the same conditions of raw materials and testing conditions, the water-binder ratio influences K_(1c). Key factor. This article quotes Xu Huarong’s senior engineer’s test results on the fracture toughness of normal concrete, and compares it with K_(1c) of high fly ash content roller compacted concrete. The results show that under the same compressive strength, high fly ash The K_(1c) of the roller compacted concrete is slightly larger than that of the normal concrete K_(1c), and the microstructure of the roller compacted concrete is analyzed.