Corrosion of Valves in Precast Piles

Abstract

The article presents the results of experimental studies of the influence of dynamic stresses, similar in their parameters to those occurring during pile driving, on the degree of violation of the structure of concrete and the subsequent corrosion of the reinforcement. The experimental samples were subjected to dynamic effects with the help of a special laboratory unit, followed by the control of the degree of micro-destruction by ultrasonic and resonance methods. After repeated cyclic effects, the samples were installed in a semi-compressed state in solutions of different salinity and, according to potentiostatic measurements, monitored the state of the reinforcement. After a certain period (from 20 to 180 days), the samples destroyed and further assessed the condition of the reinforcement in terms of area and depth of corrosion. During the experiments, the parameters of dynamic pulses, salinity of the solution and the type of concrete were changed within a wide range. Based on the results of the performed experiments, graphical dependences of the influence of the studied factors on the corrosion process of the reinforcement are constructed, their significance is determined and the main conclusions are formulated, which allow to make the necessary technical decisions to ensure the safety of the reinforcement in piles under different operating conditions