期刊
CEMENT & CONCRETE COMPOSITES
卷 134, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2022.104807
关键词
Magnesium potassium phosphate cement; Seawater; Compressive strength; Hydration; Thermodynamic modelling
资金
- National Natural Science Foundation of China
- [52178242]
The effects of seawater on properties and hydrates of MKP cement are complex, including prolonging setting time, slowing down heat release, increasing compressive strength, but decreasing water resistance. The main hydrate formed in seawater is K-struvite, with additional minor components present.
Seawater can be used as an alternative to freshwater for preparing cement-based materials. The effect of seawater on properties and hydrates of the magnesium potassium phosphate (MKP) cement pastes with Mg/PO4 molar ratio of 8 and low w/c ratio of 0.15 were investigated in this study. Compared with freshwater, seawater prolongs the MKP cement setting, slows down the heat release, increases the compressive strength in air, but slightly decreases the water resistance. K-struvite is the main hydrate in both pastes together with a minor amount of bobierrite and traces of Mg2KH(PO4)2.15H2O in seawater. Seawater leads to less K-struvite, which agrees well with thermodynamic modelling predictions, but it also leads to partial elongated K-struvite needle crystals, which could contribute to the increased compressive strength. Water exposure has little changes on the main hydrates, but caused minor additional potassium chloride in the seawater-mixed paste, which partially explains the higher strength loss.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据