聚丙烯纤维增强陶瓷模型石膏性能及机理研究  

Study on Performance Improving and Mechanism of Model- gypsum by Polypropylene Fiber

作　　者：赵敏[1] 彭家惠[1,2] 张明涛[1] 朱登玲[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]重庆建大建材有限公司,重庆400030

出　　处：《四川大学学报（工程科学版）》2014年第1期177-182,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50872160)

摘　　要：系统研究了聚丙烯纤维体积掺量(V c)及长径比(l/d)对陶瓷模型石膏工作性能、力学行为、软化系数、弯曲韧性及吸水性能的影响。研究表明:l/d600,V c0.88 kg/m3范围内石膏浆体工作性能良好,长径比、掺量增加,浆体流动性变差,凝结时间小幅缩短;石膏硬化体力学性能受纤维影响显著,长径比、掺量增大,软化系数、弯曲韧性增强;抗折强度随纤维长径比增大而降低,l/d600时,掺量增加,抗折强度呈抛物线变化,继续增大长径比,强度逐渐降低。最佳纤维参数为l/d=400,V c=0.88 kg/m3。SEM及孔结构微观机理分析表明:聚丙烯纤维综合改善模型石膏性能效果显著,纤维与石膏界面结合强度及在石膏基体中的分散程度是影响纤维-石膏复合材料性能的主要因素。The effects of l/d and Vc of polypropylene fiber on the working performance, mechanical behavior and water absorption of mod- el-gypsum were presented. The result showed that when the l/d 〈600 and Vc 〈0.88 kg/m3 ,fiber had little influence on the fluidity of gypsum slurry, and the setting time was slightly shortened by the increasing of Vo and l/d of fiber. The mechanical properties of fiber-gyp- sum composite were significantly influenced by the change of l/d and Vc. Coefficient of softness and flexural toughness grew stronger with the increase of l/d and Ve. Flexural strength decreased as parabola with the increase of l/d. The best parameter of polypropylene fi- ber was d = 400 and Ve = O. 88 kg/m3. SEM indicated that polypropylene takes advantages on the improvement of model-gypsum proper- ties. The most influence factors to composite are interface bounding of fiber-gypsum and the degree of scatter of fiber in the compound.

关 键 词：陶瓷模型石膏 聚丙烯纤维 工作性能 力学行为 吸水性能 影响机理 

分 类 号：TQ177.3[化学工程—硅酸盐工业]