干湿循环作用下风积沙混凝土的抗硫酸盐侵蚀机理

doi:10.11896/cldb.19070022

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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.

Key words： aeolian sand concrete sulfate dry-wet cycle pore characteristics salt erosion products erosion mechanism

Published: 24 December 2020

CLC number:

TU528

Fund:This work was financially supported by the National Natural Science Foundation of China (51769025,51569021),Inner Mongolia Natural Science Foundation (2020BS05008).

About author:: Ruixin Dong graduated 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. 1978—1982, former Inner Mongolia Agriculture and Animal Husbandry College, obtained a bachelor′s degree; 1989—1990, Hohai University, studied engineering mechanics course; mainly engaged in new building mate-rials and concrete durability research, focusing on new materials and new structural systems, concrete durability, etc. Published more than 180 papers, including 35 articles in SCI/EI.

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	DONG Ruixin
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Cite this article:

DONG Ruixin,SHEN Xiangdong,XUE Huijun, et al. Sulfate Resistance Mechanism of Aeolian Sand Concrete Under Dry-Wet Cycles[J]. Materials Reports, 2020, 34(24): 24040-24044.

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http://www.mater-rep.com/EN/10.11896/cldb.19070022 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24040

1 Yu H F, Sun W, Wu W F, et al. Journal of the Chinese Ceramic Society, 2003(8), 763 (in Chinese).
余红发, 孙伟, 武卫锋, 等.硅酸盐学报, 2003(8), 763.
2 Zhang P X, Zhang B Z, Tang Y, et al. Natural resources of salt lakes in China and their development and utilization, Science Press, China, 1999 (in Chinese).
张彭熹, 张保珍, 唐渊, 等. 中国盐湖自然资源及其开发利用, 科学出版社, 1999.
3 Zhang R, Wu L G.Evaluation and management of groundwater resource, Tongji University Press, China, 1997(in Chinese).
张瑞, 吴林高. 地下水资源评价及管理, 同济大学出版社, 1997.
4 Clifton J R, Knab L I. Service life of concrete, Nuclear Regulatory Commission, USA, 1989.
5 Cody R D, Cody A M, Spry P G, et al. Reduction of concrete deterioration by ettringite using crystal growth inhibition techniques. Ph. D. Thesis, Iowa State University, USA, 2001.
6 Ye H, Jin X, Fu C, et al. Construction and Building Materials, 2016, 112, 457.
7 Li Y Q, Ba M F, Liu J Z, et al. Acta Materiae Compositae Sinica, 2017, 34(12), 2856(in Chinese).
李永强, 巴明芳, 柳俊哲, 等. 复合材料学报, 2017, 34(12), 2856.
8 Wu J C, Shen X D, Dong W, et al. Bulletin of the Chinese Ceramic Society, 2015, 34(10), 2845(in Chinese).
吴俊臣, 申向东, 董伟, 等.硅酸盐通报, 2015, 34(10), 2845.
9 Ameta N K, Wayal A S, Hiranandani P. American Journal of Engineering Research, 2013 ,2(9),133.
10 Maria G M Elipe, Susana Lopez-Querol. Construction and Building Materials, 2014, 73, 728.
11 Duan Hanchen, Wang Tao, Xue Xian, et al. Environmental Monitoring and Assessment, 2014, 186, 6083.
12 Xue H J, Shen X D, Wang R Y, et al.Transactions of the Chinese Society of Agricultural Engineering, 2017, 33(18), 118 (in Chinese).
薛慧君, 申向东, 王仁远, 等.农业工程学报, 2017, 33(18), 118.
13 Zou Y X, Shen X D, Li G F, et al. Journal of Building Materials, 2018, 21(5), 817 (in Chinese).
邹欲晓, 申向东, 李根峰, 等.建筑材料学报, 2018, 21(5), 817.
14 El-Sayed Sedek Abu Seif. Arabian Journal of Geosciences, 2011, 6(3), 857.
15 Luo F J, He L, Pan Z, et al. Construction and Building Materials, 2013, 47(5), 131.
16 Li Y G, Ma X L, Hu D W, et al.Bulletin of the Chinese Ceramic Society, 2017, 36(6), 2128 (in Chinese).
李玉根, 马小莉, 胡大伟, 等.硅酸盐通报, 2017, 36(6), 2118.
17 Li G F, Shen X D, Wu J C, et al.Bulletin of the Chinese Ceramic Society, 2016, 35(4), 1213 (in Chinese).
李根峰, 申向东, 吴俊臣, 等.硅酸盐通报, 2016, 35(4), 1213.
18 Shen X D, Zou Y X, Xue H J, et al. Transactions of the Chinese Society of Agricultural Engineering, 2019, 35(2), 161 (in Chinese).
申向东, 邹欲晓, 薛慧君, 等.农业工程学学报, 2019, 35(2),161.
19 Wu J C, Shen X D. Transactions of the Chinese Society of Agricultural Engineering, 2017, 33(10), 184 (in Chinese).
吴俊臣, 申向东.农业工程学报, 2017, 33(10), 184.
20 Dong Wei, Shen Xiangdong, Xue Huijun,et al. Construction and Buil-ding Materials, 2016, 123, 792.
21 普通混凝土力学性能试验方法标准:GB/T 50081-2002,中国建筑工业出版社, 2003.
22 普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009,中国建筑工业出版社, 2009.
23 Tyrologou P, Dudeney A W L, Grattoni C A. Magnetic Resonance Imaging, 2005, 23(6),765.
24 Li J L, Zhou K P, Zhang Y M, et al.Chinese Journal of Rock Mechanics and Engineering, 2012, 31(6), 1208 (in Chinese).
李杰林, 周科平, 张亚民, 等.岩石力学与工程学报, 2012, 31(6), 1208.
25 Wu Z W, Lian H Z.High performance concrete, Railway Press, China, 2005(in Chinese).
吴中伟, 廉慧珍. 高性能混凝土, 中国铁道出版社, 2005.
26 Qian J S, Yu J C, Sun H Q, et al. Journal of the Chinese Ceramic Society, 2017, 45(11), 1569 (in Chinese).
钱觉时, 余金城, 孙化强, 等.硅酸盐学报, 2017, 45(11), 1569.