干湿循环与风沙吹蚀作用下风积沙混凝土的抗硫酸盐耐久性

doi:10.11896/cldb.19090028

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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.

Key words： aeolian sand concrete dry-wet cycle wind-blown erosion micro-morphology phase composition pore characteristics life prediction

Published: 06 November 2020

CLC number:

TU528

Fund:National Natural Science Foundation of China (51769025,51569021), Inner Mongolia Natural Science Foundation (2020BS05008).

About author:: Ruixin Donggraduated from Hebei Agricultural University in June 2017 with a bachelor’s degree. Since September 2017, he has studied at Inner Mongolia Agricultural University and is mainly engaged in the research of new building materials and concrete durability.
Xiangdong Shen, vice chairman of the Inner Mongolia Institute of Mechanics, professor, doctoral supervisor, director of civil engineering at Inner Mongolia Agricultural University. In 1982, he obtained a bachelor degree from the former Inner Mongolia Agriculture and Animal Husbandry College. From 1989 to 1990, he studied engineering mechanics course at Hohai University. He is mainly engaged in new building materials and concrete durability research, focusing on new materials and new structural systems, concrete durability, et al. Published more than 180 papers, including 35 articles in SCI/EI.

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Cite this article:

DONG Ruixin,SHEN Xiangdong,XUE Huijun, et al. Sulfate Durability of Aeolian Sand Concrete Under Dry-Wet Cycles and Sand Blowing[J]. Materials Reports, 2020, 34(20): 20053-20060.

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http://www.mater-rep.com/EN/10.11896/cldb.19090028 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20053

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