首页|Effect of monopotassium phosphate fineness on properties and micro-characteristics of magnesium potassium phosphate cements
Effect of monopotassium phosphate fineness on properties and micro-characteristics of magnesium potassium phosphate cements
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NETL
NSTL
Springer Nature
Abstract Hydration of magnesium potassium phosphate (MKP) cements is a dissolution–precipitation process. Compared to magnesia, the dissolution effect of monopotassium phosphate (KH2PO4) has been gained less attention and remains unclear. In this study influence of two KH2PO4 materials with different fineness on properties and micro-characteristics of the MKP cement pastes at Mg/PO4 molar ratio of 4 and 8 was investigated. Compared with the pastes without boric acid, the effect of KH2PO4 fineness was more obvious with the presence of boric acid due to the slowed-down reactions. The combined use of boric acid and the coarse KH2PO4 better slowed down the reactions, thus led to longer setting time but to reduced flowability, higher shrinkages and great strength losses. In contrast, the combined use of boric acid and the fine KH2PO4 facilitated a better dissolution and consumption of KH2PO4 and formations of robust K-struvite hydrates, resulting in less detrimental capillary pores, lower shrinkages and higher strengths, although the reaction could be faster. To guarantee a full consumption of KH2PO4 and mitigate strength loss over long-term, Mg/PO4 molar ratio > 4 and fine KH2PO4 are commended for those pure MKP cements.
NETL
NSTL
Springer Nature
