Experimental and computational investigation of magnesium phosphate cement mortar
Hou D.1; Yan H.3; Zhang J.2; Wang P.1; Li Z.2
Source PublicationConstruction and Building Materials
AbstractFor first time, an experimental and computational study has been conducted to investigate the properties of magnesium phosphate cement (MPC) mortar and its main hydration product struvite-K crystal that would account for the mechanical properties of these materials. Two types of MPC mortars, magnesium sodium phosphate cement (MNPC) and magnesium potassium phosphate cement (MKPC), were synthesized with magnesium to phosphate (M/P) ratio from 4 to 18 and water to solid ratio (w/s) from 0.16 to 0.2. Subsequently, the setting behavior, compressive strength and water resistance of MNPC and MKPC were investigated to study the influence of M/P and w/s ratios. An increase of M/P ratio can slow down the setting rate for both MPC mortar, and MNPC shows faster setting performance, as compared with MKPC. With increasing M/P ratio, the mechanical properties of MKPC mortar are gradually weakened, while the strength for MNPC mortar is first improved and then degrades, with the optimum value at M/P ratio of 9.5. Additionally, the saturated MPC mortars, immersed in water solution, are significantly weakened, showing poor water resistance. Micro-characterizations including X-ray diffraction and scanning electron microscopy of the MPC mortar reveal that MKPC mortars have good crystallization of struvite-K, with the morphology of plate packing at early hydration stage and the MNP hydrates show amorphous phase. Furthermore, molecular dynamics was conducted to study the structure, dynamics and mechanical properties of the main hydrated phase in MKPC cement, struvite-K crystal. The hydrolytic weakening effect of water molecules and failure mechanism have been unraveled that the H-bonds and K-Os connections lose the chemical stability due to water attacking and tensile loading, which explains the severe failure of MPC mortar observed in the water resistant experiments.
KeywordM/P ratio Magnesium phosphate cement Molecular dynamics Struvite-K
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Cited Times [WOS]:24   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Qingdao University
2.Hong Kong University of Science and Technology
3.Huaqiao University
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GB/T 7714
Hou D.,Yan H.,Zhang J.,et al. Experimental and computational investigation of magnesium phosphate cement mortar[J]. Construction and Building Materials,2016,112:331-342.
APA Hou D.,Yan H.,Zhang J.,Wang P.,&Li Z..(2016).Experimental and computational investigation of magnesium phosphate cement mortar.Construction and Building Materials,112,331-342.
MLA Hou D.,et al."Experimental and computational investigation of magnesium phosphate cement mortar".Construction and Building Materials 112(2016):331-342.
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