磷酸盐水泥的微观分析

ANALYSIS OF MICROSTRUCTURE OF PHOSPHATE CEMENT

确定了磷酸盐水泥水化反应的机理。采用红外光谱分析、差热分析、扫描电镜、Ｘ－射线衍射法研究了磷酸盐水泥的微观过程。阐明了水化的磷酸盐水泥中主要相的种类、数量、结构是决定其物理化学性能的关键。分析结果表明，磷酸盐水泥质产物中有３个相，即水化镁磷酸盐相，Ｍｇ（ＯＨ）２和ＭｇＯ相。镁磷酸盐水合物相微观结构与水泥浆开始硬化和凝固密切相关，强度发展与晶体的形成取向和反应产物的空间填充性直接相关。

The mechanism for phosphate cement hydraulic reaction is determined.The microscopic process is described by means of scanning electronic microscope,X-ray diffraction analysis,infrared spectrophotometry and differential heat analysis,The results show the three main phases are present,i.e.hydromagnesium phosphates, Mg(OH)2 and MgO phase.The type,structure,and amount of every phase play an important role in phosphate cement properties.Hydromagnesium phosphate phase structure has a close relation to phosphate cement setting and hardening.The development of strength has much to do with the formed crystalline directing.