On Sulfate Attack And Freeze-Thaw Cycles Double Factors Influence On Durability Of Concrete

Worldwide durability of concrete has achieved results, but also there is a blind spots, such as the lack of the role of multi-factor composite concrete durability test methods, degradation model, as well as prevention and treatment measures. Of salinity, Salt Lake region is quite broad, especially in the north saline areas relatively harsh climate, the result of the deterioration of hydraulic construction in these areas are mostly two-factor and even more factors, however, our concrete durability for multiple factors The few studies.Solve the above problem, a model for the study of the deterioration of the concrete sulfate attack and freeze-thaw cycle dual factors. Sulfate attack after freeze-thaw cycle, freeze-thaw cycle after sulfate attack,sulfate attack-alternating freeze-thaw cycle three concrete deterioration model analysis of the deterioration of the law, using the relative dynamic elastic modulus and the mass loss rate as a test analysis evaluation, and references injury superimposed effect coefficient derived three deterioration the model accelerated aging effect.This test analyzes greater than4.7%, the concentration of the sodium sulfate solution, the salt freezing in addition to the freeze-thaw damage, as well as sulfate crystals precipitate physical damage caused by the concrete; early analysis and additive effect coefficient The analysts believe that the two-factor role of sulfate attack and freeze-thaw cycle is not a simple superposition of effects, but1+1>2super-additive effect, these two failure to promote each other and influence each other; sulfate attack and freeze-thaw cycles oversold plus effect may be because early subtle net cracks accelerate the infiltration of the solution, resulting in a two-factor concrete deterioration accelerated; sulfateattack-freeze-thaw alternating of deterioration speed greater than the sulfate attack sulfate attack after freeze-thaw cycles and freeze-thaw cycle.