甲基硅酸钠改性磷建筑石膏耐水性能研究

Study on Water Resistance of Phosphorous Gypsum Modified by Sodium Methylsilicate

基于不同掺量的甲基硅酸钠对磷建筑石膏物理及力学性能的影响试验,选取甲基硅酸钠掺量为0.9%的磷建筑石膏进行干湿循环条件下的耐水性能试验。结果表明:甲基硅酸钠对磷建筑石膏有一定的缓凝作用,可以改善磷建筑石膏耐水性能;随着甲基硅酸钠掺量的增加,磷建筑石膏绝干抗压和抗折强度呈先下降、后上升、再下降的趋势;甲基硅酸钠掺量为0.9%时磷建筑石膏在干湿循环条件下各项性能改善较为明显。

Based on the effect of different content of sodium methylsilicate on the physical and mechanical properties of phosphorous building plaster,the water resistance of phosphorous building plaster with 0.9%content of sodium methylsilicate was tested under dry-wet cycle.The results show that sodium methylsilicate has a certain retarding effect on phosphorous building gypsum and can improve the water resistance of phosphorous building gypsum.With the increase of sodium methylsilicate content,the absolute dry compression and fracture strength of phosphorous building gypsum decreased first,then increased,and then decreased again.When the content of sodium methylsilicate is 0.9%,the properties of phosphorous building plaster are improved obviously under dry-wet cycle.