Exploration of the load fatigue test method for cement concrete wheels

Abstract

The bending and pulling fatigue test is critical for inspecting cement concrete. The existing fatigue test equipment is expensive and non-conducive for the grassroots sector of construction units. The purpose of this study is to explore a scheme to modify an asphalt mixture rutting test machine to perform bending and pulling fatigue tests on cement concrete specimens. The test results show that (1) the fatigue life obtained from the fatigue test equipment for cement wheel load under the same stress level has a large dispersion, but the fatigue equation for the same group of specimens under different stress levels is fitted and found to be above 0.9; (2) the fatigue life of cement concrete obtained by cyclic loading using semi-positive sagittal loading waveform is shown by the Weibull data distribution model, and the fit is above 0.99; and (3) in a comparative study of the fatigue obtained from fatigue tests performed on other fatigue test equipment, the percentage of the absolute value of the average difference of the equation’s correlation coefficient is between 0.01% and 10.12%. In summary, the cement wheel load fatigue test equipment data is reliable, and the test scheme is reasonable. Thus, it can be used as a test scheme to examine the bending and tensile fatigue tests of cement concrete.

Keywords

• Bending and tension fatigue test
• Cement concrete
• Wheel load fatigue testing machine
• Stress level
• Fatigue life