Abstract: In this study, the aeolian sand of the Ulan Buh Desert in Inner Mongolia Autonomous Region was selected as the fine aggregate. In addition, 40% aeolian sand was used to replace a portion of the river sand, the pore structure characteristics of aeolian sand concrete were tested and analyzed by means of NMR technology, and the micro morphology and phase composition of aeolian sand concrete were observed and analyzed using SEM and X-ray diffraction technology. As shown by the results, after 60 dry-wet cycles the mass loss rate reaches an "inflection point", in which case the compressive and corrosion resistance coefficients of the aeolian sand concrete and ordinary concrete respectively decrease to 84% and 87%. Additionally, the spectral area of the aeolian sand concrete is 1.59—2.76 times of that of the ordinary concrete, while the maximum porosity of the aeolian sand concrete is reduced by 34.1%, and the maximum porosity of the ordinary concrete is reduced by 29.3%. The proportion of harmless pores in the aeolian sand concrete and ordinary concrete is less than 10%, and the porosity is in direct proportion to the change rule of free fluid saturation, while a characteristic of small pores evolving into large pores in the concrete is present. There are a greater number of CaSO4·2H2O diffraction peaks in both the aeolian sand concrete and ordinary concrete after 120 dry-wet cycles compared with 0 dry-wet cycles, and the corrosion crystals are mostly sulfate and carbonate. Long and thin cracks 18—36 μm in length appear in the cement paste of the aeolian sand concrete, and a large number of AFt are found in the ordinary concrete. The above research results provide a theoretical reference for research regarding the durability of concrete and engineering construction in salt erosion environments.
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2020, Vol. 34 
