复合外加剂石膏粘结材料性能的试验研究

Xiangfei tomb is a national key cultural relics protection units，which located in Kashi city, Xinjiang. Most glazed tiles in north of Xiangfei tomb dome fall off, especially bellow of about 1/2 dome roof semicircle part glazed tiles fall off very serious，rainwater leaking. Therefore developed high bond strength，flexible well gypsum bonding material has an important significance to prevent the glaze tiles fall off，historic preservation. Through experiments studied the performance of the composite admixture gypsum，results show that：by adding the appropriate proportion of polyvinyl alcohol and methyl cellulose improved the bond strength and the flexibility of the gypsum at the same time. Add white cement can increase compressive strength of gypsum，but reduced the flexibility of the gypsum. Add citric acid and bone glue，can be extended gypsum retarding and meet the requirements of construction, but have a negative effect on the gypsum strength and flexibility improvement.