Laboratory test on moisture adsorption-desorption of wall paintings at Mogao Grottoes, China  

作　　者：Hu-yuan ZHANG Geng-sheng YAN Xu-dong WANG 

机构地区：[1]MOE Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University Lanzhou 730000, China [2]School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China [3]National Engineering Research Center of Ancient Mural Protection, Dunhuang 736200, China [4]Dunhuang Academy, Dunhuang 736200, China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第3期208-218,共11页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Key Technology R&D Program during the 11th Five-Year Plan of China (No. 2006BAK30B02);the China National Engineering Research Center for Conservation of Ancient Wall Paintings Program (No. 200806)

摘　　要：Moisture adsorption-desorption tests (MATs) were conducted on simulated mural plaster specimens under different air temperatures (ATs) and relative humidity (RH) to investigate the possible effect of seasonal alteration and visitors’ breath on the deterioration of Mogao Grottoes, Dunhuang, China. Saturated salt solutions were used to maintain a constant RH, and plant growth cabinets were used to maintain a constant or varying temperature in the simulation test. The weight of specimen was periodically measured to determine the adsorbed or desorbed moisture. Test data illustrate that the desorption process is far quicker than the adsorption one, indicating that it is possible to inhibit the disadvantage effect from visitors, such as shortening the staying time in caves. In case of high humidity, an accumulated moisture adsorption was found to correspond to the varying temperature. On the other hand, in case of low humidity, accumulated moisture desorption corresponded. Test data imply that opening caves more often to visitors in humid seasons should be avoided so as to prevent continuous wetting of wall paintings.Moisture adsorption-desorption tests （MATs） were conducted on simulated mural plaster specimens under different air temperatures （ATs） and relative humidity （RH） to investigate the possible effect of seasonal alteration and visitors＇ breath on the deterioration of Mogao Grottoes, Dunhuang, China. Saturated salt solutions were used to maintain a constant RH, and plant growth cabinets were used to maintain a constant or varying temperature in the simulation test. The weight of specimen was periodically measured to determine the adsorbed or desorbed moisture. Test data illustrate that the desorption process is far quicker than the adsorption one, indicating that it is possible to inhibit the disadvantage effect from visitors, such as shortening the staying time in caves. In case of high humidity, an accumulated moisture adsorption was found to correspond to the varying temperature. On the other hand, in case of low humidity, accumulated moisture desorption corresponded. Test data imply that opening caves more often to visitors in humid seasons should be avoided so as to prevent continuous wetting of wall paintings.

关 键 词：Mogao Grottoes Wall paintings Piaster Moisture adsorption-desorption Unsaturated soil 

分 类 号：TU5[建筑科学—建筑技术科学]