Effect of curing conditions on strength and pore development of aeolian sand concrete
The curing condition plays an important role in the development of concrete strength,in order to study its influence on the performance of aeolian sand concrete,the cube compressive test was carried out to determine the optimal replacement rate of aeolian sand.On this basis,the development law of concrete microstructure under natural curing,standard curing and water curing were discussed by nuclear magnetic resonance test.The results show that the optimum replacement rate of aeolian sand is 20％,and the compressive strength reaches the maximum.The compressive strength of aeolian sand concrete under different curing conditions is:water curing＞standard curing＞natural curing.The T2 map of aeolian sand concrete under water curing and standard curing conditions gradually moves to the left with the increase of curing age,and the proportion of harmless holes is relatively high.However,under natural curing conditions,the proportion of harmful holes is relatively high,which is not conducive to improving the compressive strength.Compared with standard curing,the end position of concrete peak under water curing condition is earlier,the average pore size decreases,and the proportion of harmless holes increases.
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