Abstract: Aeolian sands from Ulan Buh Desert in Inner Mongolia Autonomous Region were selected as fine aggregates, 40% do sage of aeolian sand was used to replace part of river sand, and scanning electron microscopy and X-ray diffraction techniques were used to observe and analyze the microscopic morphology of aeolian sand concrete. The phase composition was tested by NMR technique on the pore structure characteristics of aeolian sand concrete, and its durability was predicted. The research shows that the mass loss of aeolian sand concrete under coupling conditions is 2.21 times higher than that under a single dry-wet cycle. The curve of compressive and corrosion resistance under coupling conditions is always lower than that of single dry-wet cycle; the maximum erosion depth of D120 is 1.66 mm, the depth of the ditch of D120S8 is 3.51 mm; after 120 cycles of dry and wet cycles, a 9 μm slender crack appears in the cement slurry of single dry and wet action, and a through crack of 18—36 μm appears in the coupling condition. Most of the corrosion crystallization materials are sulfate and carbonate; the T2 spectrum mainly shows two peaks under the two conditions. The pore growth rate of aeolian sand concrete under coupling is greater than that of single dry-wet cycle; with the increase of the number of dry-wet cycles, small pores decrease, the large pores increase, transforming the small pores into large pores, and the porosity is proportional to the change of free fluid saturation; the service life of the aeolian sand concrete is 125 a by the life prediction model. This paper provides theoretical basis for the construction of aeolian sand concrete in the sulfate environment of wind erosion area.
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2020, Vol. 34 
