聚乙烯醇纤维对磷建筑石膏基复合材料性能的改善研究  

Study on the Improvement of Properties of Phosphate-based Building Gypsum Composite by Polyvinyl Alcohol Fiber

作　　者：宁兴桃 陶忠[2,3] 黄荣贵 沈金金 辛昌星 杨攀 NING Xingtao;TAO Zhong;HUANG Ronggui;SHEN Jinjin;XIN Changxing;YANG Pan(School of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming 650500,China;Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Seismic Engineering Technology Research Center,Kunming 650500,China)

机构地区：[1]昆明理工大学公共安全与应急管理学院,昆明650500 [2]昆明理工大学建筑工程学院,昆明650500 [3]云南省抗震工程技术研究中心,昆明650500

出　　处：《材料导报》2024年第S02期636-640,共5页Materials Reports

基　　金：国家自然科学基金(52268051);云南省农业联合专项-面上项目(202301BD07001-128)。

摘　　要：磷建筑石膏存在韧性差、强度低等不良特性,为改善其性能,本工作采用正交试验法,将不同长度及不同掺量的聚乙烯醇纤维分别掺入磷建筑石膏基复合材料中,通过目测分析、极差分析和方差分析三种方法探究聚乙烯醇纤维对磷建筑石膏基复合材料性能的改善情况。研究发现当PVA纤维直径不变时,在一定范围内,纤维掺量和纤维长度的增加能改善磷建筑石膏基复合材料(PVARGC)的力学性能;结合目测分析和极差分析得出,当PV纤维的长度为12 mm、体积掺量为1.6%时,PVARGC的绝干抗折强度和绝干抗弯强度最大,当PVA纤维的长度为9 mm、体积掺量为0.8%时,PVARGC的绝干抗压强度最大,当PVA纤维的长度为9 mm、体积掺量为1.6%时,PVARGC的绝干抗拉强度最大,且绝干抗折强度、绝干抗弯强度、绝干抗拉强度和绝干抗压强度相对于空白组分别提高了273%、164.29%、34.73%和100%;此外,通过方差分析得出,PVA的长度对PVARGC的绝干抗折强度、绝干抗弯强度和绝干抗拉强度的影响大于体积掺量的影响,而PVA的体积掺量对绝干抗压强度的影响大于纤维长度的影响。Phosphogypsum-based building gypsum exhibits poor toughness and low strength.To enhance its performance,this study employed the orthogonal test method to incorporate PVA fibers of varying lengths and contents into the phosphogypsum matrix composites.Visual analysis,range analysis,and variance analysis were conducted to investigate the impact of PVA fibers on the properties of phosphogypsum-based building gypsum matrix composites.It is found that when the diameter of PVA fiber remains unchanged,the increase of fiber content and fiber length can improve the mechanical properties of phosphorus building gypsum matrix composites(PVARGC)within a certain range.Combined with visual analysis and range analysis,it was found that when the length of PVA fiber was 12 mm and the volume content was 1.6%,the absolute dry flexural strength and absolute flexural strength of PVARGC were the largest,when the length of PVA fiber was 9 mm and the volume content was 0.8%,the absolute compressive strength of PVARGC was the largest.When the length of PVA fiber was 9 mm and the volume content was 1.6%,the absolute dry tensile strength of PVARGC was the largest.Compared with the blank group,the absolute dry flexural strength,absolute flexural strength,absolute dry tensile strength and absolute dry compressive strength were increased by 273%,164.29%,34.73%and 100%,respectively.In addition,the analysis of variance showed that the influence of PVA length on the absolute dry flexural strength,absolute flexural strength and absolute dry tensile strength of PVARGC was greater than that of the volume content,while the effect of the volume content of PVA on the absolute compressive strength was greater than that of the fiber length.

关 键 词：磷建筑石膏 聚乙烯醇纤维 长度 掺量 力学性能 

分 类 号：TU526[建筑科学—建筑技术科学]