无损检测方法推定普通混凝土早龄期抗拉强度

In view of the papers in the concrete’s non-destructive method domestic and overseas, found that there is not enough research of concrete early-age tensile strength based on non-destructive method, this paper, in using of static load tensile destructive testing and ultrasonic examination testing, the two experimental methods to study and forecast the concrete tensile strength at the early age. There were two different ways of experiment, destructive testing and non-destructive testing. The testing started at the first day after casting the samples and subsequently the 3rd, 5th,7th, 14th and 28th. The Destructive testing is for obtaining the tensile strength and the non-destructive testing is for obtaining the ultrasonic velocity of the same sample at the same age. According to the results of experiment, the relation between the tensile strength and ultrasonic velocity for the concrete C30 and C50 was obtained; this is very useful and practical for the domain of construction and research of the cracking in concrete at the early-age.