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(重庆大学 材料科学与工程学院)；彭家惠(重庆大学 材料科学与工程学院;重庆建大建材有限公司)；张明涛(重庆大学 材料科学与工程学院)；朱登玲(重庆大学 材料科学与工程学院)
Author：Zhao Min(College of Materials Sci. and Eng.,Chongqing Univ.)；Peng Jiahui(College of Materials Sci. and Eng.,Chongqing Univ.;Chongqing Jianda Construction Materials Co. Ltd.)；Zhang Mingtao(College of Materials Sci. and Eng.,Chongqing Univ.)；Zhu Dengling(College of Materials Sci. and Eng.,Chongqing Univ.)
收稿日期：2013-07-08 年卷（期）页码：2014,46(1):177-182
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：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
Key words：model-gypsum;polypropylene fiber;working ability;mechanical action;water absorption;action mechanism
基金项目：国家自然科学基金资助项目(50872160)
中文摘要
系统研究了聚丙烯纤维体积掺量（Vc）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，Vc≤0.88kg/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，Vc=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。
英文摘要
The effects ofl/dandVcof polypropylene fiber on the working performance,mechanical behavior and water absorption of model-gypsum were presented.The result showed that when thel/d≤600 andVc≤0.88 kg/m3,fiber had little influence on the fluidity of gypsum slurry,and the setting time was slightly shortened by the increasing ofVc andl/dof fiber.The mechanical properties of fiber-gypsum composite were significantly influenced by the change ofl/dandVc.Coefficient of softness and flexural toughness grew stronger with the increase ofl/dandVc.Flexural strength decreased as parabola with the increase ofl/d.The best parameter of polypropylene fiber wasl/d=400 andVc=0.88 kg/m3.SEM indicated that polypropylene takes advantages on the improvement of model-gypsum properties.The most influence factors to composite are interface bounding of fiber-gypsum and the degree of scatter of fiber in the compound.
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