Stress-Strain Relationship of Plastic Fiber Reinforced Rubber Concrete

The uniaxial compression tests were carried out on the prism specimens of plastic fiber–reinforced rubber concrete with three water-binder ratios and six kinds of plastic fiber contents, and the stress-strain curves were monitored. According to the uniaxial compression test, the change rule of the rising and falling of the stress-strain curve and the change of the peak strain were analyzed. Based on the features of the stress-strain curves, the uniaxial compressive constitutive model for plastic fiber–reinforced rubber concrete is proposed containing constitutive parameters A and B. By using the regressive analysis with the least squares principle method for the experimental data, we propose the mathematical expression of the constitutive parameters “a” and “b” of the rubber concrete, which demonstrates the specific relationship between the constitutive parameters A and B. Thus, the constitutive equation for plastic fiber–reinforced rubber concrete was obtained.