短切聚丙烯纤维增强磷建筑石膏强度影响研究

Study on Strength of Short-cut Polypropylene Fiber Reinforced Phosphate Building Gypsum

本试验研究了短切聚丙烯纤维的长度、掺量对磷建筑石膏的扩展度、吸水率、绝干抗折强度、绝干抗压强度的影响。通过origin软件对抗折强度、抗压强度数据进行非线性回归分析,得到回归方程和最佳掺量,并进行试验验证。分析了短切聚丙烯纤维对磷建筑石膏强度的影响机理。结果表明:长度为9 mm的短切聚丙烯纤维对磷建筑石膏的增强效果最佳;9 mm短切聚丙烯纤维掺量在1.38%~1.5%时,磷建筑石膏的绝干抗折强度可以达到8.88~8.98 MPa,相较于空白组提高了37.5%~39.0%;9 mm短切聚丙烯纤维掺量在1.47%~1.5%时,磷建筑石膏的绝干抗压强度可以达到26.16~26.52 MPa,相较于空白组提高48.4%~50.4%。

This experiment explored the length and dosage of short-cut polypropylene fiber on the expansion of phosphorus building gypsum, water absorption, absolute dry compressive and flexural strength. Nonlinear regression analysis of the flexural strength and compressive strength data by origin software was carried out, the regression equation and the optimal dosage were obtained, and then the experimental verification was carried out. The mechanism of the effect of chopped polypropylene fiber on the strength of phosphorus building gypsum was analyzed. The results show that the short-cut polypropylene fiber with the length of 9 mm has the best reinforcement effect on the phosphorus building gypsum. When the 9 mm shortcut polypropylene fiber content is 1.38%-1.5%, the absolute dry flexural strength of the phosphorus building gypsum can reach 8.88-8.98 MPa, which is 37.5%-39.0% higher than that of the blank group. When the 9 mm chopped polypropylene fiber content is 1.47%-1.5%, the absolute dry compressive strength of phosphorus building gypsum can reach 26.16-26.52 MPa, compared with the blank group increased by 48.4%-50.4%.