大掺量粉煤灰混凝土抗弯强度试验误差的研究

Test error of the bending strength of concrete with high volume fly ash

针对水泥取代率30%以上的大掺量粉煤灰混凝土的力学性能指标进行了测试。重点分析了单点及双点加载试验条件下,各龄期混凝土抗弯强度的增长率及误差。结果表明:双点加载条件下大掺量粉煤灰混凝土28、91 d抗弯强度及抗弯强度离散系数较单点加载条件下测试值减小;后期抗弯强度增长率测试值无明显差异;路面用混凝土在粉煤灰取代率大于规范规定的30%时,需考虑抗弯强度的误差影响。

Mechanics Performance was tested to the rate more than 30% of concrete with high volume fly ash.It analyzed growth rate and error of the bending strength of concrete under test conditions of single point load test and two points load test.Test values of 28 d and 91 d of the bending strength and coefficient of variability of concrete with high volume fly Ash was decreased under two points load test, Test values had no significant difference in the late; the bending strength of error influence should be considered that fly ash replacement ratio was greater than 30%.