硅酸盐学报2017，Vol.45Issue(5)：651-656,6.DOI:10.14062/j.issn.0454-5648.2017.05.08
固化模拟放射性核素Sr对磷酸镁水泥水化特性的影响
Influence of Solidifying Simulated Radionuclide Sr on Hydration Characteristics of Magnesium Phosphate Cement
摘要
Abstract
Effect of solidifying simulated radionuclide Sr on the performance of magnesium phosphate cement (MPC) was investigated.The mechanism on the hydration characteristics of magnesium phosphate cement after solidifying Sr was discussed via the analysis of the hydration heat,phase composition and microstructures of the solidified bodies.The results show that magnesium phosphate cement solidified bodies have superior mechanical properties,and the compressive strength of solidified bodies at 1 d is 4.5 times greater than that of the national standard.The leaching rate and the cumulative leaching fraction of magnesium phosphate cement solidified bodies at 42 d are less than those of the national standard because of the high resistance of leaching.Sr can hinder the hydrolysis and ionization of phosphate in the early stage of hydration,while the rate of the solution of MgO and the formation of hydration product MgKPO4·6H2O decrease with the increase of Sr content.The yield of hydration products decreases after mixing Sr,which is the main reason for the decrease of compressive strength at the initial stage of hydration.The crystallization degree decreases,the structure of hydration product changes and the pore size increases with the increase of curing time,resulting in the decrease of the compressive strength.关键词
磷酸镁水泥/固化/锶/水化Key words
magnesium phosphate cement/solidifying/strontium/hydration分类
建筑与水利引用本文复制引用
戴丰乐,汪宏涛,张时豪,丁建华,姜自超..固化模拟放射性核素Sr对磷酸镁水泥水化特性的影响[J].硅酸盐学报,2017,45(5):651-656,6.基金项目
国家自然科学基金项目(51272283) （51272283）
重庆市自然科学基金重点项目(cstc2012jjB50009). （cstc2012jjB50009）
