Salt crystallization in cold sulfate saline soil

被引：69

作者：

Wan, Xusheng ^{[1
]}

Hu, Qijun ^{[1
]}

Liao, Mengke ^{[2
,3
]}

机构：

[1] Southwest Petr Univ, Sch Civil Engn & Architecture, Chengdu 610513, Sichuan, Peoples R China

[2] State Grid Xinjiang Econ Res Inst, Urumqi Xingjiang 830000, Peoples R China

[3] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China

来源：

COLD REGIONS SCIENCE AND TECHNOLOGY | 2017年 / 137卷

基金：

中国国家自然科学基金;

关键词：

Supersaturation ratio; Sodium sulfate decahydrate; Surface free energy; Critical nucleation radius; Salt expansion force; Frost heave pressure; POROUS MATERIALS; CRYSTAL-GROWTH; MINERAL SOLUBILITIES; SYSTEM; MODEL;

D O I：

10.1016/j.coldregions.2017.02.007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The effect of sodium sulfate crystallization on soil freezing temperature, and the changes in salt expansion and frost heave pressure with temperature were analyzed experimentally and using crystallization theory. The Pitzer ion model was used to find the supersaturation ratio of a sodium sulfate solution in soil.The relationship between the initial supersaturation ratio and temperature was obtained, which provided criteria for the presence of salt crystals over the entire temperature range. Experiments were carried out to determine the effect of cooling the sodium sulfate saline soil as well as the location of salt crystallization. Analysis of the location and shape change of salt crystals based on the experiments clarified the interaction between salt crystallization and ice-water phase change. A formula relating the surface free energy of a crystal to its critical nucleation radius was deduced based on the assumption of homogeneous nucleation. Finally, equations for the salt expansion force and frost heave pressure were obtained and their rationalizations were provided.(C) 2017 Elsevier B.V. All rights reserved.

引用

页码：36 / 47

页数：12

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