纤维增强磷酸镁水泥基复合材料研究进展

Research Progress on Fiber Reinforced Magnesium Phosphate Cement Composites

磷酸镁水泥(MPC)是一种由重烧氧化镁与可溶性磷酸盐通过酸碱反应在早期形成高强度的新型无机胶凝材料,具有强度发展迅速、碱度低、粘接能力强等优势。然而,由于微观结构、物相组成等特点,MPC脆性大,易开裂,其应用受到极大影响。通过纤维增强提升韧性的纤维增强磷酸镁水泥基复合材料(FRMPC)引起了人们的广泛关注。本文系统介绍了近年来不同类型纤维制备的FRMPC的抗压、抗拉和抗弯等力学性能,结合MPC自身特性分析了不同纤维通过桥接、界面作用的增韧机制,并分析了FRMPC现阶段的主要应用途径,在纤维增强水泥基材料的研究进展基础上提出了未来FRMPC在组成设计、分析测试和机理研究等方面的发展趋势。

Magnesium phosphate cement(MPC)is a new kind of inorganic cementitious material formed by through-solution acid-based reactions between dead-burned magnesium oxide and soluble phosphate with high strength at an early stage.MPC has the advantages of rapid strength development,low alkalinity and superior adhesive strength.However,due to the microstructure and crystal phases volume fraction,MPC is typically brittle and easy to crack,which greatly limits its application.Fiber reinforced magnesium phosphate cement composites(FRMPC),which enhances toughness through fiber reinforcement,has attracted much attention.In this paper,the compressive,tensile and flexural strength of FRMPC are systematically introduced.Combining with the characteristics of hydrated MPC,the toughening mechanism of fiber through bridging and interface action is analyzed.The main application methods of FRMPC are summarized.Based on recent research progress of fiber reinforced cement-based composites,this review also puts forward the development trend of FRMPC in proportion design,testing method and mechanism research.