固化模拟放射性核素Sr对磷酸镁水泥水化特性的影响

发布时间：2018-03-22 00:11

本文选题：磷酸镁水泥　切入点：固化　出处：《硅酸盐学报》2017年05期 　论文类型：期刊论文

【摘要】：研究了固化模拟放射性核素Sr对磷酸镁水泥性能的影响,通过分析固化体水化热、物相组成及微观形貌,探讨了Sr对磷酸镁水泥水化特性的影响机理。结果表明:固化体的力学性能优异,1 d抗压强度即可达到国家标准的4.5倍以上;磷酸镁水泥固化体具有优异的抗浸出性,42 d浸出率及累计浸出分数远低于国家标准的要求;Sr会阻碍磷酸盐在水化初期的水解及电离,同时MgO溶解及水化产物MgKPO_4·6H_2O生成的速率随Sr掺量增大而减缓;掺入Sr后水化产物生成量大幅下降是水化初期抗压强度降低的主要原因,随着龄期增长,水化产物结晶程度降低、结构改变以及孔隙孔径增大成为固化体抗压强度降低的主要原因。
[Abstract]:The effect of solidified simulated radionuclide Sr on the properties of magnesium phosphate cement was studied. The hydration heat, phase composition and microstructure of the solidified body were analyzed. The influence mechanism of Sr on hydration characteristics of magnesium phosphate cement is discussed. The results show that the compressive strength of the solidified body can reach more than 4.5 times of the national standard for one day with excellent mechanical properties. The leaching rate and cumulative leaching fraction of magnesium phosphate cement solidified body with excellent leaching resistance for 42 days are far lower than the national standard, and Sr will hinder the hydrolysis and ionization of phosphate in the early hydration stage. At the same time, the dissolution rate of MgO and the formation rate of hydration product MgKPO_4 6H_2O slowed down with the increase of Sr content, the main reason for the decrease of compressive strength in the initial hydration stage was the decrease of hydration product production after the incorporation of Sr, and the crystallization degree of hydration product decreased with the increase of age. The change of structure and the increase of pore diameter are the main reasons for the decrease of the compressive strength of the solidified body.
【作者单位】：中国人民解放军后勤工程学院化学与工程材料系;
【基金】：国家自然科学基金项目(51272283) 重庆市自然科学基金重点项目(cstc2012jj B50009)
【分类号】：TQ172.1

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