Experimental research and theoretical analysis on the differences in internal and external performance of concrete
In practical engineering,the damage of concrete is from the surface to the inside,and the performance of the surface concrete is very important.To clarify the mechanism of the difference in internal and external performance of concrete,it uses salt freezing,water absorption,and mercury intrusion experiments to study the effect of curing conditions on the permeability of concrete at different depths on the surface layer.CT scanning technology is used to analyze the proportion of coarse aggregate in concrete at different depths on the surface layer,and the reasons for the difference in internal and external permeability of concrete are analyzed.The results indicate that under the investigated curing conditions,the impermeability performance of internal concrete is superior to that of surface concrete.Compared with standard curing,there is a greater difference between the internal and surface performance of concrete under natural curing,and as the curing period prolongs,the difference between the internal and surface performance gradually increases.The proportion of coarse aggregate in concrete varies at different depths.The proportion of coarse aggregate at 50 mm below the surface reaches 49％,and both the degree of hydration and the proportion of coarse aggregate can affect the permeability of concrete.
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