EFFECT OF AXIAL LOAD ON SULFATE ATTACK OF SEMI-IMPREGNATED CONCRETE

In order to further study the semi-soaked environment in actual engineering, the part of concrete exposed to the air suffers from more serious erosion and damage, and the difference of the degradation law between the adsorption zone and the immersion zone, five kinds of stress ratio axial load and two concentrations of sulfate solution coupling under long-term semi-immersion and dry-wet cycle tests were designed, and the concrete under full immersion was set as a control. Comparing the difference of deterioration law between adsorption zone and immersion zone, analyzing the influence of different axial loads and sulfate concentration on mass, relative dynamic elastic modulus and compressive strength.The test results showed that the deterioration degree of concrete in all combined adsorption zones at the same age was greater than that in the immersion zone and full immersion, the low stress ratio had a certain effect of inhibiting deterioration on the early stage of erosion, and the higher stress ratio and larger sulfate concentration had a significant effect on the deterioration of the specimen. Under the coupling action of 0.2 and 0.3 ratio and 5% sulfate concentration, the relative dynamic elastic modulus of specimen in 300 d age decreased by 12% and 7%.The relative dynamic elastic modulus at 50% stress ratio and 5%, 10% sulfate coupling decreased to 38% and 42%.