磷建筑石膏纤维复合体耐水性能研究
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摘要
利用干湿循环试验,研究了磷建筑石膏纤维增强前后的耐水性能,并与天然建筑石膏的耐水性进行对比分析。结果表明:通过纤维增强的磷建筑石膏纤维复合体耐水性能得到提升,接近甚至优于天然石膏。磷建筑石膏纤维复合体的吸水率由15.42%降低至14.2%,软化系数由0.44提升至0.52;抗折强度由5.66 MPa增加至8.54 MPa;3种建筑石膏溶蚀率均呈现先增长较快后增长幅度趋于平缓的趋势,干湿循环在第6次至第30次,天然建筑石膏溶蚀率比磷建筑石膏和磷建筑石膏纤维复合体高0.2百分点左右;3组建筑石膏试件在干湿循环养护30个周期后,强度及强度系数均呈下降趋势,磷建筑石膏和天然石膏均有明显下降,纤维增强后,磷建筑石膏纤维复合体下降幅度较小。
In this paper, the water-resistance performance of phosphorus building gypsum fiber before and after reinforcement was studied by dry-wet cycle test, and compared with the water resistance of natural building gypsum. The test results show that the water resistance of the fiberreinforced phosphorus building gypsum fiber composite is improved, which is close to or even better than that of natural gypsum. The water absorption of the phosphorus building gypsum fiber composite decreased from 15.42% to 14.2%, the softening coefficient increased from 0.44 to 0.52, and the flexural strength increased from 5.66 MPa to 8.54 MPa. The dissolution rates of the three building gypsums increased first and then increased. The trend tends to be gentle, the wet and dry cycle is from the 6 th to the 30 th, the corrosion rate of natural building gypsum is about 0.2 percentage higher than that of the phosphorus building gypsum and phosphorus building gypsum fiber composite; the three building gypsums are cured in the dry and wet cycle 30 After the cycle, the strength and strength coefficient all showed a downward trend. Both the phosphorus building gypsum and the natural gypsum decreased significantly. After the fiber reinforcement, the polypropylene fiber-phosphorus building gypsum decreased slightly.
In this paper, the water-resistance performance of phosphorus building gypsum fiber before and after reinforcement was studied by dry-wet cycle test, and compared with the water resistance of natural building gypsum. The test results show that the water resistance of the fiberreinforced phosphorus building gypsum fiber composite is improved, which is close to or even better than that of natural gypsum. The water absorption of the phosphorus building gypsum fiber composite decreased from 15.42% to 14.2%, the softening coefficient increased from 0.44 to 0.52, and the flexural strength increased from 5.66 MPa to 8.54 MPa. The dissolution rates of the three building gypsums increased first and then increased. The trend tends to be gentle, the wet and dry cycle is from the 6 th to the 30 th, the corrosion rate of natural building gypsum is about 0.2 percentage higher than that of the phosphorus building gypsum and phosphorus building gypsum fiber composite; the three building gypsums are cured in the dry and wet cycle 30 After the cycle, the strength and strength coefficient all showed a downward trend. Both the phosphorus building gypsum and the natural gypsum decreased significantly. After the fiber reinforcement, the polypropylene fiber-phosphorus building gypsum decreased slightly.
引文
[1]李丹,赵志曼,田睿,等.有机防水剂对磷建筑石膏性能影响研究[J].非金属矿,2018,41(5):38-40.
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[7]吴其胜,黎水平,刘学军,等.聚丙烯酰胺乳液对脱硫建筑石膏性能的影响[J].材料科学与工程学报,2012,30(4):571-572.
[2]葛静冉,彭家惠,彭志辉,等.水分对模具石膏性能及微观结构的影响[J].材料科学与工程学报,2016,34(3):410-416.
[3]陈兆荣,刘卫东,贾美晨,等.脱硫石膏制作粉刷石膏的耐干湿循环性能[J].材料科学与工程学报,2016,34(4):586-589.
[4]李志新,彭家惠,戎延团,等.再生石膏水化过程、强度及耐水性的变化研究[J].非金属矿,2015,38(5):34-36.
[5]彭家惠,林芳辉.石膏基外墙粉刷材料耐水性研究[J].新型建筑材料,1995(6):23-26.
[6]赵拉,解田,刘佳,等.磷石膏的物化特征及其作为建筑材料的性能研究[J].西安建筑科技大学学报,2009,41(4):587-592.
[7]吴其胜,黎水平,刘学军,等.聚丙烯酰胺乳液对脱硫建筑石膏性能的影响[J].材料科学与工程学报,2012,30(4):571-572.