Different Damaged Shaft Lining Concrete Resistance to Sulfate Corrosion

Shaft lining concrete itself has a certain degree of initial damage before being corroded by sulfate. In order to study the resistance of the concrete of the initial damage in different corrosion solution concentration of sulfate, samples of concrete without initial damage, loaded 50% ultimate load and loaded 70% ultimate load with initial damage concrete were selected and studied their corrosion resistance in 9%, 12% and 15% concentrations of sulfate solution. The results show that compared with concrete with no initial damage, the concrete with initial damage resistance to sulfate corrosion is varied. With the increased concentration of the corrosion solution, the concrete with worse initial damage exhibited much lower resistance to sulfate corrosion. conditions, the mix proportion of the concrete used in the experiment is the mix proportion of the shaft lining concrete in actual practical environment. The concrete was damaged by the pre loading before putting it into sulfate solution. Mass change and relative dynamic modulus of elasticity ex- press concrete resistance to sulfate corrosion in the experi- ment. The resistance to sulfate corrosion with no initial dam- age of the concrete, loaded 50% ultimate load and loaded 70% ultimate load with initial damage concrete was studied. The experimental results have certain reference significance for durability assessment and life prediction of damaged shaft lining concrete structure in the sulfate environment.