聚乙烯醇纤维对磷建筑石膏基复合材料性能的影响

Effect of Polyvinyl Alcohol Fiber on Properties of Phosphorus Building Gypsum Matrix Composites

为了改善磷建筑石膏强度低、韧性差的不良特性,本文在磷建筑石膏基复合材料中掺入不同直径和掺量的聚乙烯醇纤维,通过试验分析探究聚乙烯醇纤维对磷建筑石膏基复合材料工作性能和力学性能的影响。结果表明,聚乙烯醇纤维的掺入能够显著降低浆体的流动度和缩短浆体的凝结时间。同时,聚乙烯醇纤维的掺入可以显著提高复合材料的力学强度,当纤维直径为15μm、体积掺量为1.6%时,复合材料的力学性能最佳,抗折强度、抗压强度、抗弯强度和抗拉强度分别为10.071、13.25、10.73和2.89 MPa。此外,通过SEM对材料结构的微观形貌进行观察,聚乙烯醇纤维能够分散在磷建筑石膏的孔隙和裂缝中,使复合材料的内部结构更加密实,提高了复合材料的力学性能。

In order to improve the poor characteristics of low strength and poor toughness of phosphorus building gypsum,polyvinyl alcohol fibers of different diameters with different content were added to phosphorus building gypsum matrix composites.And the effects of polyvinyl alcohol fibers on the working and mechanical properties of phosphorus building gypsum matrix composites were explored through experimental analysis.The results show that the incorporation of polyvinyl alcohol fiber can significantly reduce the fluidity of the slurry and shorten the setting time of the slurry.At the same time,incorporating polyvinyl alcohol fiber can significantly improve the mechanical strength of the composite when the fiber diameter is 15μm and the volume content is 1.6%.In the same composition,the composites mechanical properties are the best,the flexural strength,compressive strength,bending strength and tensile strength are 10.071,13.25,10.73 and 2.89 MPa,respectively.In addition,the microscopic morphology of the material structure was observed by SEM,and it is found that polyvinyl alcohol fiber can be dispersed in the pores and cracks of phosphorus building gypsum,which makes the interior structure of the composite more solid and improves the mechanical properties.