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在对超声-回弹综合法进行研究的基础上,提出采用超声-回弹-电阻率三参数法评定混凝土的强度。研究结果表明,混凝土试块的电阻率随着龄期的增长而增大;在龄期相同的情况下,混凝土试块的强度等级越高,其电阻率也越大。电阻率-强度散点图显示,电阻率与混凝土强度的相关性显著,且数据的离散性小,因此电阻率是适宜用作混凝土强度评定的参数。
Based on the study of ultrasonic - rebound synthesis method, the strength of concrete is evaluated by ultrasonic - rebound - resistivity three parameter method. The results show that the resistivity of concrete specimens increases with age, and the concrete specimens with the same age have the higher resistivity. The resistivity-intensity scatter plot shows that the resistivity is significantly related to the concrete strength and the data is less discrete, so the resistivity is a suitable parameter for assessing the strength of the concrete.