›› 2014, Vol. 299 ›› Issue (2): 459-465.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on effects of humidity on capillary migration of salt solutions in mural plaster

JIANG Xiao1, ZHANG Hu-yuan1, YAN Geng-sheng2, WANG Jin-fang3   

  1. 1. Key Laboratory of Mechanics on Western Disaster and Environment in Western China of Ministry of Education, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, China; 2. HydroChina Xibei Engineering Corporation, Xi’an, 710065, China; 3. Key Laboratory of Western China’s Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou, 730000, China
  • Received:2012-11-26 Online:2014-02-11 Published:2014-02-18

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Abstract: Salt migration and enrichment caused by the capillary migration of the salt solutions have been the important cause of mural deterioration. The soluble salt redistribution which influenced by the capillary migration of salt solutions in mural plaster under different humidities is studied. At the same time, the increase in height of capillary with time, water content and electrical conductivity distribution with height, specimen surface before and after capillary saturation under different environmental humidities, either the content of the soluble solution distributions with height after capillary migration are analyzed. The test results show that, the lower the air relative humidity is, the more water migration to air during the capillary rise is; it is difficult for water to move upward at the same time. The water content of samples with height decreases, but the electrical conductivity of samples with height increases. The crystallization of soluble salt in rising capillary water occurred. NaCl crystallization is enriched in capillary striker, Na2SO4 crystallization is enriched mainly in the second striker. The results of this study can provide a scientific basis for preventing and controlling salt damage of the mural.

Key words: salt solutions, mural plaster, capillary migration, humidity

CLC Number: 

  • TU 412
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