Deterioration Law of Aeolian Sand Concrete Under Carbonation and Dry-Wet Cycles

In order to clarify the damage deterioration law of durability indexes such as apparent morphology, quality, water absorption and compressive strength of aeolian sand concrete under carbonization and dry-wet cycles, aeolian sand was completely replaced by ordinary river sand to prepare aeolian sand concrete, and its carbonization test (carbonization age was 0 d, 14 d and 28 d) was carried out, apparent morphology, compressive strength, quality, water absorption and other parameters were used to characterize the deterioration law of durability of aeolian sand concrete under carbonation and dry-wet cycles. The results showed that the morphology changed little in the early stage of carbonization and dry-wet cycles, and network cracks gradually appeared in the later stage; with the increase of dry-wet cycles, the compressive strength of aeolian sand concrete first increased and then decreased; the mass of non carbonated concrete increased the most in 25 seconds of dry-wet cycles, and the mass of carbonated concrete increased the least in 28 days of carbonation age; carbonation delayed the occurrence time of surface salt crystallization, improved the compressive strength of aeolian sand concrete, as well as the durability of aeolian sand concrete in dry and wet environment.