基于CECS 02标准中声速修正系数的研究

Study of Sound Velocity Correction Coefficient in CECS 02 Standard

为修订《超声回弹综合法检测混凝土强度技术规程》(CECS02:2019),对现行《超声回弹综合法检测混凝土强度技术规程》(CECS02:2005)标准中的超声声速修正系数β进行了系统的试验。研究表明在混凝土的侧面~侧面间与顶面~底面间的对测声速并不存在现行《超声回弹综合法检测混凝土强度技术规程》(CECS02:2005)标准中规定的修正系数β=1.034的关系;同时,试验数据得出的混凝土的侧面与顶面、侧面与底面的平测声速的比值均不超过2%,即现行《超声回弹综合法检测混凝土强度技术规程》(CECS02:2005)标准规定的在混凝土浇筑的顶面或底面平测时,测区混凝土中声速代表值均应按±5%修正的量偏大。

In order to revise Technical Specification for Concrete Strength Detection by Ultrasonic Rebound Method (CECS 02:2019), the ultrasonic sound velocity correction coefficient β in the current Technical Specification for Concrete Strength Detection by Ultrasonic Rebound Method (CECS 02:2005) edition standard is systematically tested. The study shows that the relationship between the measured sound velocities on the side - side and the top - bottom surfaces of the concrete does not exist in the correction coefficient β= 1.034 stipulated in the current CECS 02:2005. At the same time, the ratios of measured sound velocity on the side and top surfaces, and the side and bottom surfaces of concrete achieved by the test data are no more than 2%, that is, when the top or bottom surfaces of concrete pouring stipulated in the current CECS 02:2005 standard are measured, the representative value of sound velocity in concrete of tested zone is rather large, and should be corrected by ±5%.