原材料及配比对磷酸镁水泥强度的影响

发布时间：2018-01-24 04:20

本文关键词： 磷酸镁水泥硼砂水胶比 MgO比表面积　出处：《当代化工》2015年11期 　论文类型：期刊论文

【摘要】：研究了M/P比值(Mg O与K2HPO4的质量比),水胶比(W/C),硼砂掺量,Mg O比表面积对磷酸镁水泥早期强度的影响,采用扫描电子显微镜对磷酸镁水泥的微观形貌进行了表征。结果表明:磷酸镁水泥1 h的抗压强度随M/P比值的增大而减小,在水化龄期为3 d和7 d时,M/P比值为4:1时磷酸镁水泥石的强度最高,最高强度达到了74.68 MPa,水胶比对磷酸镁水泥石早期强度影响不大,7 d强度随着水胶比的增大而减小,磷酸镁水泥在水化早期随着硼砂掺量的增加,水化产物晶体变得细小,晶体缺陷增多,结构疏松,其强度随着硼砂掺量增加而降低,后期水化产物连接成一体,结构致密,7 d的强度几乎没有变化。水化龄期在7 d内,磷酸镁水泥石的强度随Mg O比表面积的增大而增大。
[Abstract]:The effects of mass ratio of Mg-O and K2HPO4, water / binder ratio (W / C) and borax content (mg / O) on the early strength of magnesium phosphate cement were studied. The microstructure of magnesium phosphate cement was characterized by scanning electron microscope. The results showed that the compressive strength of magnesium phosphate cement decreased with the increase of M / P ratio for 1 h. When the hydration age is 3 days and 7 days, the strength of magnesium phosphate cement is the highest, and the maximum strength is 74.68 MPa when the ratio of M / P is 4: 1. The effect of water / binder ratio on the early strength of magnesium phosphate cement is not significant. The strength of magnesium phosphate cement decreases with the increase of water / binder ratio. At the early stage of hydration, the hydration product crystal becomes fine with the increase of borax content. With the increase of crystal defects and loose structure, the strength of the hydration product decreases with the increase of borax content, and the strength of the hydrated product is almost unchanged in 7 days, and the hydration age is within 7 days. The strength of magnesium phosphate cement increases with the increase of MgO specific surface area.
【作者单位】：后勤工程学院化学与材料工程系;73101部队保障部营房科;92995部队后勤部营房科;
【基金】：重庆市自然科学基金项目(CSTC2012jj B50009)
【分类号】：TQ172.1
【正文快照】： 磷酸镁水泥具有快凝快硬的特点,1 h强度达到20 MPa,3 h强度可达40 MPa以上,因此是一种较理想的抢修抢建材料。同时在军事工程抢修抢建,修补等方面具有广阔的应用前景[1-5]。近年来,在生物医药,油井固化,废弃物固化、放射性元素固化、3D打印技术等领域也有进一步的发展[6-10]。

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