Experiment on the correlation between flexural load capacity of reactive powder concrete cover and NDT parameters

In order to effectively predict the cracking strength and breaking strength of reactive powder concrete (RPC) covers in real projects. Twenty-seven RPC covers used in actual projects were collected and tested for surface hardness, surface rebound value, ultrasonic wave velocity, shear pressure value, nominal cracking strength, and nominal breaking strength. The relationships between different testing parameters and nominal breaking strength and nominal cracking strength were linearly fitted. The results showed that the linear correlation between the surface rebound value of RPC cover and the nominal cracking strength measured by mortar-type rebound tester was stronger, with a correlation coefficient of 0.82. It was recommended to use the mortar-type rebound tester to test the surface rebound value of RPC cover to predict its bending capacity in the actual project.