有机聚合物改性磷建筑石膏基砂浆性能研究

Effect of Organic Polymer Ether on Properties of Phosphogypsum

以磷建筑石膏为主要原料制备磷建筑石膏基胶凝材料,研究两种有机聚合物纤维素醚、可再分散乳胶粉掺量对磷建筑石膏基砂浆跳桌扩展度、力学强度和表观密度的影响,分析其作用机理。结果表明,两种有机聚合物对磷建筑石膏基砂浆跳桌扩展度、抗拉伸黏结强度均有改善作用,但会造成磷建筑石膏基砂浆表观密度下降;随着纤维素醚掺量的提高,磷建筑石膏基砂浆7 d、28 d抗折强度和7 d、28 d立方体抗压强度总体呈现先上升后下降的趋势;可再分散乳胶粉在适当掺量范围内对磷建筑石膏基砂浆7 d、28 d抗折强度有小幅度提升,而7 d、28 d立方体抗压强度随着可再分散乳胶粉掺量的增加呈持续下降趋势。

Based on the idea of making phosphor building gypsum-based cementing materials,the effects of two kinds of organic polymer cellulose ether and redispersible latex powder on the jump table expansion,mechanical strength and apparent density of phosphor building gypsumbased mortar under different contents were mainly studied,and then the mechanism was analyzed.The research shows that the two kinds of organic polymers can improve the jumping table expansion and tensile bonding strength of phosphor building gypsum-based mortar,but the apparent density of phosphor building gypsum-based mortar will decrease.In addition,the 7 d and 28 d flexural strength and 7 d and 28 d cube compressive strength of phosphor building gypsum-based mortar generally increase first and then decrease with the increase of cellulose ether content.The 7 d and 28 d flexural strength of phosphor building gypsum-based mortar increased slightly with the appropriate addition of redispersible latex powder,while the 7 d and 28 d cube compressive strength decreased continuously with the increase of the addition of redispersible latex powder.