Mechanical properties of concrete after acid rain corrosion based on particle discrete element

Resumen

To predict the durability of concrete structure and ensure the safety of life and property, a method to analyze the mechanical properties of concrete corroded by acid rain based on particle discrete element is presented. Eight test specimens of prestressed concrete beams were designed, and then test specimens of concrete beams with different corrosion rates were obtained by simulation of acid rain corrosion. The impact splitting load test was carried out based on the particle discrete element, and then the meso-mechanics model of concrete particle discrete element was built. Experiment results show that the stress process of the test concrete beam after acid rain corrosion includes three stages: uncracking, crack increasing with load, crushing and spalling. After the acid rain corrosion, the splitting tensile strength of TYL-b (the upper tensile reinforcement) beam is the highest, and the splitting tensile strength of TYL-d (the lower compression reinforcement) beam is the lowest. The corrosion rate of acid rain is inversely proportional to the splitting tensile strength of concrete. The splitting tensile strength of concrete after acid rain corrosion obtained by the proposed method is consistent with the actual value. Therefore, the proposed method has high accuracy and high practical value.