The chemical excitation effect of magnesium oxide and sodium sulfate on the self-healing performance of concrete cracks was investigated,through prefabricated cracks of concrete blocks with different contents of magnesium oxide and curing them in sodium sulfate solution of different concentrations and the rebound velocity of the concrete block with cracks was measured by ultrasonic comprehensive rebound method. Then the changes of wave velocity and compressive strength of test blocks at different curing ages were compared and analyzed. The results show that the self-healing age of concrete cra...
