Bulging deformation mechanism of asphalt pavement in sulfate saline soil areas of Xinjiang

FENG Rui-ling; WANG Sui-zhu; WU Li-jian; LU Huan-cai; SHEN Yu-peng

doi:10.11779/CJGE202109020

Volume 43 Issue 9

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Chinese Journal of Geotechnical Engineering > 2021 > 43(9): 1739-1745. > DOI: 10.11779/CJGE202109020

FENG Rui-ling, WANG Sui-zhu, WU Li-jian, LU Huan-cai, SHEN Yu-peng. Bulging deformation mechanism of asphalt pavement in sulfate saline soil areas of Xinjiang[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(9): 1739-1745. DOI: 10.11779/CJGE202109020

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Bulging deformation mechanism of asphalt pavement in sulfate saline soil areas of Xinjiang

1.
College of Civil and Architecture Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
Beijing Engineering Research Center of Rail Transit Safety and Disaster Prevention, Beijing 100044, China
3.
Institute of Highway Science and Technology, Xinjiang Production and Construction Corps, Urumqi 830000, China
4.
Research Institute of Highway (RIOH), Ministry of Transport, Beijing 100088, China

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Received Date: December 29, 2020
Available Online: December 02, 2022

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Abstract

Based on two highways in Aksu prefecture of Xinjiang, four typical diseased sections are selected to excavate test pits on the basis of investigating bulging diseases of highways, the damage of structure layer pavement is observed, the salt content, mineral composition and pH value of base and subgrade fill are sampled and tested, and the mechanism of pavement diseases of the two highways is analyzed. The results show that the ions in the base course of Highway A (Provincial Highway) are mainly ${SO}_{4}^{2 -}$ ${SO}_{4}^{2 -}$ and ${Ca}_{}^{2+}$ ${Ca}_{}^{2+}$ , so a chemical reaction takes place and Ettringite is formed. The content of ${Ca}_{}^{2+}$ ${Ca}_{}^{2+}$ in the base course of Highway B (National Highway) is high, and it also contains a certain amount of ${SO}_{4}^{2 -}$ ${SO}_{4}^{2 -}$ and ${CO}_{3}^{2 -}$ ${CO}_{3}^{2 -}$ , so a chemical reaction takes place and Wollastonite gypsum is formed. In addition, the high temperature in summer and the alkali content in cement exceed the standard, accelerate the occurrence of two kinds of sulfate erosion. Finally, according to the mechanism of the two highway diseases, the preventive measures for bulging diseases of highways in the sulfate saline soil areas are put forward.
- sulphate saline soil,
- asphalt pavement,
- semi-rigid base,
- bulging deformation,
- sulfate attack

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Bulging deformation mechanism of asphalt pavement in sulfate saline soil areas of Xinjiang

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