可溶盐对砖石文物的风化和对保护材料的影响~

The Deterioration and Effluence to Consolidates of Soluble Salts in Sandstone and Brick

本文在分析砖石样品特性的基础上,将已知量的盐引入具有不同孔隙度的砖石样块中,经过吸盐、干化、等温吸湿、脱盐等研究,分析了盐对砖石文物的风化作用和盐对保护材料的影响。保护剂分别为含氟聚合物及其与有机硅的共混改性材料,可溶盐是多孔文物风化常见的NaCl,Na2SO4,CaSO4,NaCl+Na2SO4和NaCl+CaSO4。研究结果表明,盐的存在对临界含湿量有影响,不同盐对砖石材料呈现不同的风化现象。吸盐量很大程度上取决于材料的孔隙度、所吸盐的性质,到达临界含湿量的时间主要取决于材料的孔隙率。脱盐效果与盐的种类、盐的吸入量有关。

Different soluble salts was introduced into sandstone and brick taken from ancient buildings on the basis of characteristics investigation,in order to evaluate the influence of these salts on different porosity materials,as well as the effect on protection materials.The protection materials used are fluorinated polymer and org-silicone,the soluble salts are NaCl,NaSO4,CaSO4,NaCl+Na2SO4,NaCl+CaSO4 seperately.It was found that the amount of salt remaining in the porous materials is strongly dependent on its porosity and the nature of salt.NaCl and Na2SO4 behavour the significant deterioration phenomena.Salt desalination treatment was also discussed in the paper.