Research on the Flexural Performance of RC Beams Under Coupling of Flexural Loads and Acid-Alkali Dry-Wet Cycles

In order to obtain the influence law of livestock farm environment on the flexural performance of concrete structures, the experimental study of flexural performance of reinforced concrete (RC) beams under the coupling effect of bending load and acid-alkali dry-wet cycles was carried out by simulating the real livestock farm environment with the type of corrosive environment, corrosion cycle time and initial crack width as variables. The test phenomena, crack distribution and load-midspan deflection curves were obtained by the four-point bending tests, and the influence laws of each test variable on the flexural performance were compared and analyzed. The results showed that:all specimens were ductile failure; acid dry-wet cycles could enhance the ultimate bearing capacity of the specimen but weaken its deformation capacity, alkaline dry-wet cycles had little effect on the flexural capacity of the specimen, acid-alkali dry-wet cycles slightly reduced the ultimate load of the specimen, while greatly reducing the deformation capacity; the presence of initial cracks reduced the yield and ultimate load of the specimen, had a certain effect on the deformation capacity of the specimen; the increase in acid-alkali wet-dry cycle time decreased the deformation capacity of the specimen and had a greater effect on the stiffness and deformation capacity of the specimen with 45 mm protective layer thickness.