Early age hydration and application of blended magnesium potassium phosphate cements for reduced corrosion of reactive metals
Early age hydration and application of blended magnesium potassium phosphate cements for reduced corrosion of reactive metals
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DOI：
10.1016/j.cemconres.2021.106375
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发表时间：
2021-02-04
影响因子：
11.4
通讯作者：
Hyatt, Neil C.
中科院分区：
文献类型：
--
作者：
Gardner, Laura J.;Corkhill, Claire L.;Hyatt, Neil C.
研究了磷酸钾镁水泥（MKPC）对反应性铀金属腐蚀的延缓效果。优化低水含量，粉煤灰（FA）和高炉矿渣（BFS）混合MKPC配方的开发和其流动性，水化行为，强度和相组合的研究。原位时间分辨同步辐射粉末X射线衍射被用来详细说明早期年龄（类似于60小时）相组合的发展和水化动力学，其中观察到的列入BFS延迟鸟粪石-K的形成类似于14小时相比，FA添加（类似于2小时）。在此期间内设置的所有样品，这表明可能形成一个不良的结晶结合相鸟粪石-K结晶之前。使用金属铀的长期腐蚀试验表明，与英国核工业灌浆相比，MKPC系统能够限制铀腐蚀速率（降低一半），这突出了其潜在的应用放射性废物固定。
Magnesium potassium phosphate cements (MKPC) were investigated to determine their efficacy towards retardation of reactive uranium metal corrosion. Optimised low-water content, fly ash (FA) and blast furnace slag (BFS) blended MKPC formulations were developed and their fluidity, hydration behaviour, strength and phase assemblage investigated. In-situ time resolved synchrotron powder X-ray diffraction was used to detail the early age (similar to 60 h) phase assemblage development and hydration kinetics, where the inclusion of BFS was observed to delay the formation of struvite-K by similar to 14 h compared to FA addition (similar to 2 h). All samples set within this period, suggesting the possible formation of a poorly crystalline binding phase prior to struvite-K crystallisation. Longterm corrosion trials using metallic uranium indicated that MKPC systems are capable of limiting uranium corrosion rates (reduced by half), when compared to a UK nuclear industry grout, which highlights their potential application radioactive waste immobilisation.