高贝利特水泥混凝土的断裂韧性

Fracture Toughness of High Belite Cement Concrete

为研究高贝利特水泥混凝土的断裂性能,通过三点弯曲梁试验,比较了高贝利特水泥混凝土与硅酸盐混凝土的双K断裂参数。结合载荷–裂口张开位移曲线分析,探讨了高贝利特水泥混凝土的断裂能。结果表明:高贝利特水泥混凝土载荷–裂口张开位移曲线下覆盖的面积大于硅酸盐水泥混凝土,混凝土对载荷能量有较高的吸收能力,断裂能大,断裂韧度大;高贝利特水泥混凝土的起裂韧度和失稳韧度分别是硅酸盐水泥混凝土的1.17倍和1.24倍。高贝利特水泥混凝土的断裂性能优于硅酸盐水泥混凝土的。

The fracture toughness of high belite cement concrete was investigated. For this purpose, three-point bend tests were carried out on high belite cement concrete and silicate cement concrete, respectively. The double-K fracture parameters were determined. The fracture energy of high belite cement concrete was analyzed based on a pressure---crack-mouth-opening-displacement curve. The results reveal that there is more area covered by the pressure---crack-mouth-opening-displacement curve of high belite cement con- crete than that of silicate cement concrete. This reflects that the high belite cement concrete has a higher adsorptive capacity of load energy and a greater fracture toughness. The fracture energy of high belite cement concrete is greater, resulting in that the initial frac- ture toughness and unstable fracture toughness are 1.17 times and 1.24 times as great as those of silicate cement concrete, respectively The fracture performance of high belite cement concrete is thus better than that of silicate cement concrete.