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Effect of Friedel’s salt on strength enhancement of stabilized chloride saline soil

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Abstract

In the field of soil stabilization, only calcium silicate hydrate (CSH) and ettringite (AFt) as hydration products have been reported to directly contribute to the strength enhancement of the soil. A chloride dredger fill, an artificial chloride saline soil, and a non-saline soil were stabilized by Portland cement (PC) and PC with Ca(OH)2 (CH) with different contents. A series of unconfined compressive strength (UCS) tests of stabilized soil specimen after curing for 7 d and 28 d were carried out, and the hydration products and microstructure of the specimens were observed by X-ray diffractometry (XRD), scanning electronic microscopy (SEM), and energy-dispersive X-ray analysis (EDXA). The results showed that the strengths of PC+CH-stabilized chloride saline soils were much higher than those of PC-stabilized soils. A new hydration product of calcium aluminate chloride hydrate, also known as Friedel’s salt, appeared in the PC+CH-stabilized chloride saline soils. The solid-phase volume of Friedel’s salt expanded during the formation of the hydrate; this volume filled the pores in the stabilized soil. This pore-filling effect was the most important contribution to the significantly enhanced strength of the PC+CH-stabilized chloride saline soils. On the basis of this understanding, a new optimized stabilizer was designed according to the concept that the chloride in saline soil could be utilized as a component of the stabilizer. The strength of the chloride saline soils stabilized by the optimized stabilizer was even further increased compared with that of the PC+CH-stabilized soils.

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Authors and Affiliations

  1. School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China

    Yin Cheng  (程寅), Zhan-guo Li  (李战国) & Xin Huang  (黄新)

  2. College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    Xiao-hong Bai  (白晓红)

Authors
  1. Yin Cheng  (程寅)
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  2. Zhan-guo Li  (李战国)
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  3. Xin Huang  (黄新)
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  4. Xiao-hong Bai  (白晓红)
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Corresponding author

Correspondence to Xin Huang  (黄新).

Additional information

Foundation item: Project(51008007) supported by the National Natural Science Foundation of China; Project(2013318J01100) supported by the Science and Technology Project of Ministry of Communications, China

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Cheng, Y., Li, Zg., Huang, X. et al. Effect of Friedel’s salt on strength enhancement of stabilized chloride saline soil. J. Cent. South Univ. 24, 937–946 (2017). https://doi.org/10.1007/s11771-017-3496-7

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  • DOI: https://doi.org/10.1007/s11771-017-3496-7

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