摘要
本文采用XRD、SEM-EDS、TG-DSC、MIP等现代测试方法对硬化磷酸镁水泥(MPC)浆体的水化产物、微观结构进行了研究,并对MPC水化过程进行分析。结果表明,MPC主要水化产物为带有结晶水的磷酸镁钾晶体和凝胶(MgKPO4·nH2O-MKP)以及反应剩余的MgO晶体,水化反应充分时水化产物为MgKPO4·6H2O,反应过快水化反应不充分时水化产物为MgKPO4·H2O,其中MgKPO4·6H2O为主要水化产物,以晶体和无定形状态存在,其MPC浆体具有更好的物理和力学性能;MPC浆体是以氧化镁颗粒为基体,以磷酸盐水化晶体和凝胶为胶结料的晶体结构网;水化体系pH值对氧化镁的离解和水化反应的进行起重要作用。
Modern characterization techniques including XRD, SEM-EDS, TG-DSC and MIP, etc. were employed to investigate the phase, the morphology and the microsturcture of the hardened magnesium phosphate cement (MPC) paste in this paper. The results show that the main hydration product is MgKPO4 nH2O(MKP) and some unreacted MgO. When the hydration reaction is adequate, the hydration product is MgKPO4 6 H2O. When the reaction is too fast and not adequate, the hydration product is MgKPO4 H2O in the form of both crystalline and amorphous phases, exhibiting better physical and mechanical properties. The unreacted MgO act as nucleus of the hardened framework, allowing the hydrates to grow around the MgO grain rims, to fill in the voids and eventually to bond these unreacted MgO grains to become a solid paste.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2013年第6期901-906,共6页
Journal of Materials Science and Engineering
基金
国家重点基础研究发展计划资助项目(2009CB623104)
河南理工大学博士基金资助项目(B2013-012)
关键词
磷酸镁水泥
水化产物
微观结构
magnesium phosphate cement
hydration product
microstructure