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Influence of magnesia-to-phosphate molar ratio on microstructures, mechanical properties and thermal conductivity of magnesium potassium phosphate cement paste with large water-to-solid ratio
Xu B.; Ma H.; Li Z.
2015
Source PublicationCement and Concrete Research
ISSN00088846
Volume68Pages:1-9
AbstractThis paper describes the influence of the magnesia-to-phosphate (M/P) molar ratios ranging from 4 to 12, on the properties and microstructures of magnesium potassium phosphate cement (MKPC) pastes with a large water-to-solid ratio (w/s) of 0.50. The setting behavior, compressive strength, tensile bonding strength and thermal conductivity of the MKPC pastes, were investigated. The results show that an increase in the M/P ratio can slow down the setting reaction, and clearly degrade the mechanical strengths, but clearly improve the thermal conductivity of MKPC pastes. Furthermore, micro-characterizations including X-ray diffraction, scanning electron microscopy and thermogravimetric analysis, on the MKPC pastes reveal that a lower M/P ratio can facilitate better crystallization of the resultant magnesium potassium phosphate hexahydrate (MKP) and a denser microstructure. Moreover, strong linear correlations are found between the mechanical strengths and the MKP-to-space ratio, and between thermal conductivity and the volume ratio of the unreacted magnesia to the MKP.
KeywordChemically bonded ceramics (D) Mechanical properties (C) MgO (D) Microstructure (B) Transport properties (C)
DOI10.1016/j.cemconres.2014.10.019
URLView the original
Language英語
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被引频次[WOS]:54   [WOS记录]     [WOS相关记录]
Document TypeJournal article
专题University of Macau
AffiliationHong Kong University of Science and Technology
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Xu B.,Ma H.,Li Z.. Influence of magnesia-to-phosphate molar ratio on microstructures, mechanical properties and thermal conductivity of magnesium potassium phosphate cement paste with large water-to-solid ratio[J]. Cement and Concrete Research,2015,68:1-9.
APA Xu B.,Ma H.,&Li Z..(2015).Influence of magnesia-to-phosphate molar ratio on microstructures, mechanical properties and thermal conductivity of magnesium potassium phosphate cement paste with large water-to-solid ratio.Cement and Concrete Research,68,1-9.
MLA Xu B.,et al."Influence of magnesia-to-phosphate molar ratio on microstructures, mechanical properties and thermal conductivity of magnesium potassium phosphate cement paste with large water-to-solid ratio".Cement and Concrete Research 68(2015):1-9.
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