Saline expansion and frost heave of sodium sulfate solution during cooling crystallization process
LI Xing-xing1, 2, WANG Si-jing1, XIAO Rui-hua1, CHENG Dong-xing3, YAN Fu-zhang4
1. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Northwest Electric Power Design Institute Co., Ltd of China Power Engineering Consulting Group, Xi'an 710075, China; 4. State Power Economic Research Institute, Beijing 102209, China
Abstract：During cooling process, solubility of sodium sulfate decreases, and part of sodium sulfate in the solution precipitates and crystallizes. When the temperature is lower than the specific temperature, in addition to crystallization of sodium sulfate, liquid water also precipitates as ice. The crystallization of the aqueous solution in porous medium induces the deformation and failure of porous medium, such as saline expansion and frost heave deformation of saline soils with sulfate sodium, salt efflorescence of wall painting, degradation of stone and concrete, etc. To study the deformation and failure mechanism of porous medium with saline solution during cooling process, the method for calculating the volumetric change rate of the system of Na2SO4+H2O during cooling process is proposed. In the procedure of calculation, the content of phases is determined according to the equilibrium concentration of phases in the system, Na2SO4+H2O, and the volume of the phases is added to calculate volumetric change rate of the system. Compared with the existing tests, the proposed method can successfully predict the volumetric change rate. The saline expansion rate is smaller than frost heave rate during cooling process. In addition, when heptahydrate sodium sulfate crystallizes and precipitates during at the saline expansion stage, the volumetric change ratio is relatively small, but the volumetric change abruptly increases at the frost heave stage.
李星星, 王思敬, 肖锐铧, 程东幸, 严福章. 硫酸钠溶液在降温结晶过程中的盐胀与冻胀[J]. 岩土工程学报, 2016, 38(11): 2069-2077.
LI Xing-xing, WANG Si-jing, XIAO Rui-hua, CHENG Dong-xing, YAN Fu-zhang. Saline expansion and frost heave of sodium sulfate solution during cooling crystallization process. Chinese J. Geot. Eng., 2016, 38(11): 2069-2077.
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