纤维特性对磷酸镁基免蒸压加气混凝土性能的影响  

Effect of Fiber Performance on Properties of Magnesium Phosphate-based Non-autoclaved Aerated Concrete

作　　者：陈畅[1] 丁学成 酒少武[1] 陈延信[1] CHEN Chang;DING Xuecheng;JIU Shaowu;CHEN Yanxin(College of Materials Science and Engineering,Xi′an University of Architecture&Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《材料导报》2025年第10期94-100,共7页Materials Reports

基　　金：“十四五”国家科技重点项目(2022YFC3801401);安徽省科技重点项目(2021e03020003);陕西省创新能力支撑计划项目(2021TD-53)。

摘　　要：免蒸压加气混凝土(NAAC)存在强度低和易开裂的问题。本工作采用磷酸镁水泥(MPC)作为基体制备磷酸镁基免蒸压加气混凝土(MPC-NAAC),通过添加聚丙烯纤维和玻璃纤维对其进行增强,系统研究了纤维长度和掺量对其物理、力学和耐水性能的影响;并采用X射线衍射仪和扫描电镜分析其微观结构,揭示了纤维的增强机理。研究结果表明:纤维可以在降低MPC-NAAC干密度的同时提高其抗压和抗折强度,聚丙烯纤维和玻璃纤维的最佳长度均为9 mm,最佳掺量均为0.1%。此时,聚丙烯纤维增强的MPC-NAAC抗压和抗折强度较对照组分别提高了5.95%和16.46%;玻璃纤维增强的MPC-NAAC抗压和抗折强度较对照组分别提高了12.70%和11.39%。此外,纤维与基体之间的作用是物理作用,聚丙烯纤维表现出拔出破坏机制,玻璃纤维表现出断裂破坏机制。Non-autoclaved aerated concrete has problems of low strength and easy cracking.In this work,magnesium phosphate cement was used as the matrix to fabricate the magnesium phosphate-based non-autoclaved aerated concrete(MPC-NAAC).The effects of length and content of polypropylene and glass fibers on the properties of MPC-NAAC were systematically investigated.The microstructure was analyzed by X-ray diffractometer and scanning electron microscope to reveal the reinforcement mechanism of the fibers.The results showed that the fibers can improve the compressive and flexural strengths of MPC-NAAC and reduce its dry density.The optimum length and content of both polypropylene and glass fibers were 9 mm and 0.10%,respectively.With this optimum length and content,the compressive and flexural strengths of polypropylene fiber-reinforced MPC-NAAC increased by 5.95%and 16.46%,respectively;and the compressive and flexural strengths of glass fiber-reinforced MPC-NAAC increased by 12.70%and 11.39%,respectively.In addition,the interaction between the fibers and the matrix was physical.A pull-out damage mechanism was exhibited for the polypropylene fiber-reinforced MPC-NAAC and a fracture damage mechanism was exhibited for the glass fibers-reinforced MPC-NAAC.

关 键 词：磷酸镁水泥 纤维长度 纤维掺量 力学性能 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]