Experiment Of Different Injuries Reinforced Concrete Beams Under Chloride Salt Erosion And Freeze-thaw Alternately Affected

During construction, concrete structure cracks because of temperature effects, at the same time will vary depending on load cracking during service,so long structure with cracks in working condition. In cold areas and for chloride environment in service hydraulic concrete structures, often also suffer erosion effect of chloride and freeze-thaw cycles. In this paper, there are cracks in the reinforced concrete member injury were studied Chloride erosion and freeze-thaw cycle alternating.mainly for the following studies:(1) Gas freeze thaw salt test of concrete test cubes were conducted to study the concrete in the salt air freeze thaw environment surface morphology, mass loss and concrete cube compressive strength variation with freeze-thaw cycles, the initial establishment the relationship between the compressive strength of concrete cubes and freeze-thaw cycles between the financial conditions under cold salt air.(2) Through the air freeze thaw salt experiment of different damage concrete beams, the static load damage concrete beam in freeze-thaw cycles and apparent morphological changes in chloride environments, mass loss, corrosion potential and internal steel corrosion rate; static load through the freeze-thaw cycles destruction test, studied the failure modes, load-deflection curve variation, analyzed the different static load bearing capacity of the remaining damaged beams under reduced salt air freeze thaw conditions and the degree of stiffness degradation, and the literature different ways of freezing and thawing test the results were compared.(3) By freezing the salt air of fatigue damage of reinforced concrete beam melting experiment, the morphological changes apparent fatigue damage concrete beams under freeze-thaw cycles and chloride environment, the loss of quality, corrosion potential and internal steel corrosion rate; by fatigue damage concrete beams through freeze-thaw cycles after destruction of static load test, the effects of the failure modes, load-deflection curve variation, analysis of residual salt thaw frozen gas bearing capacity under conditions of fatigue damage and reduce the extent of the beam stiffness degradation law while comparing the differences between different ways of freezing and thawing on fatigue damage degradation residual Capacity of beam.