Theoretical Study on the Size Effect of the Rate Characteristics of Concrete Cubes Compressive Strength

Abstract

In order to study the effect of size effect and rate correlation on the mechanical properties of concrete, a total of 228 concrete cube test blocks of three sizes (70, 100 and 150mm) were tested and studied under four strain rates (10−5,10−4,10−3,10−2/s). The test results show that under the same strain rate, the peak stress of concrete decreases with the increase of the size. Under the same size, the peak stress of concrete increases with the increase of strain rate. Experimental data were used to verify and modify Weibull size effect equation based on statistics and Bazant size effect equation based on fracture mechanics. The experimental data fit well with the equation, and the size effect theory of concrete strength with correlation of holdup is established.