Abstract: In order to investigate the rationality of desert sand concrete application in the salty and dry cold region of Northwest China, the freeze-thaw cycle test of concrete with desert sand dosage as a variable in sulphate environment was designed. In the test, weighed the concrete with 20% desert sand dosage gradient and determined its macroscopic performance indexes such as self-oscillation frequency and curing compressive strength, etc., and analyzed the deterioration process of salt-freezing resistance of concrete and its microstructural evolution law under the gra-dient of desert sand dosage by using characterization techniques such as NMR, SEM and XRD. The results show that at the same curing stage, the compressive strength of concrete with the increase of desert sand dosage gradient shows a complex trend of "first declines, then rises and then declines", and the compressive strength reaches the peak when the dosage is 40%. With the salt freezing cycle test, when the desert sand dosage increases from 0% to 40%, the initial porosity of concrete decreases, the mass loss rate and relative dynamic elastic modulus change is small, and when the desert sand dosage is more than 40%, the damage of concrete specimen increases with the increase of the desert sand do-sage, which can be seen that the best salt freezing resistance of the concrete is achieved when the desert sand dosage is 40%. Through the SEM results, it's found that the concrete specimen inside the interface between the aggregate and the cement paste interface transition zone and the crack is the weaker zone of the desert sand concrete. The main reason for the extension of concrete cracks in the late stage of the test is due to the erosion products such as calcium alumina and gypsum crystal aggregates generated at the internal pores of the specimen. These findings can provide a basis for the research and application of desert sand concrete in water conservancy projects in the salty and dry cold regions of northwest China.
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2025, Vol. 39 
