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本文在超声回弹2参数法的基础上,提出加入混凝土强度等级因素的超声-回弹-强度等级3参数法,并参照CECS02:2005规程用最小二乘法建立测强曲线,验证结果证明3参数模型相对于规程推荐方法显著的提高了预测精度,曲线相对误差由原来的16%下降到13%左右,满足了规程规定的地区曲线相对误差≯14%的要求。因此,该模型可以应用到工程实践中,值得推广。
Based on the 2-parameter ultrasonic rebound method, the ultrasonic-resilience-strength grade 3 parameter method with the concrete strength grade factor is put forward. The strength curve is established by the least squares method according to the CECS02: 2005 standard. The verification results show that the 3 parameters Compared with the recommended method, the model significantly improves the prediction accuracy. The relative error of the curve is reduced from 16% to 13%, meeting the requirement of 相14% of the relative error of the region curve prescribed by the rules. Therefore, the model can be applied to engineering practice and worth promoting.