Research of magnesium phosphosilicate cement

Ding, Zhu

doi:10.14711/thesis-b849110

Cited by 5 publications

(12 citation statements)

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“…The hydrated reaction rate of MPCBC was controlled by the release of Mg 2+ ions because of the free solubility of KH 2 PO 4 . Therefore, the kinetic analysis method was used to determine the releasing rate of Mg 2+ ions to estimate the activity of MgO under different M:P ratios, because the measuring principle was similar with the reacting process of MPCBC . The schematic illustration of the kinetic analysis of MgO chemical activity was shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The diffraction peaks of MgKPO 4 •6H 2 O were not observed in the sample fabricated with high M:P ratios, as most of them existed in the form of amorphous phase. Previous studies indicated the growth of hydrated product was controlled by pH value . For the case of the high M:P ratio, MgO particles were added and dissolved into the solution, pH value would increase as H + was consumed to dissolve MgO.…”

Section: Resultsmentioning

confidence: 99%

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Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios

Wang

Fan

et al. 2014

Int J Applied Ceramic Tech

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Magnesium phosphate chemically bonded ceramics attracted much attention because of its good biocompatibility. In this work, curing behavior and microstructure of magnesium phosphate chemically bonded ceramics with different MgO to KH 2 PO 4 ratios were investigated. The results showed that the setting time decreased and the maximum temperature during the solidifying process increased as the increase of MgO to KH 2 PO 4 ratio. Phase compositions were different for those samples fabricated with different MgO to KH 2 PO 4 ratios. KH 2 PO 4 , MgO, and hydrated product existed in the sample with lower MgO to KH 2 PO 4 ratio because of the incomplete reaction, and numerous acicular polycrystals were found. There were only MgO and hydrated product existed with the higher MgO to KH 2 PO 4 ratio. Besides, a gelatinous structure with lots of cracks was also found. Clearly, the properties of magnesium potassium phosphate chemically bonded ceramics could be controlled by changing the MgO to KH 2 PO 4 ratio. It is better to fabricate magnesium phosphate chemically bonded ceramics with optimal structure and properties suitable for biomedical applications in range of MgO to KH 2 PO 4 ratio from 3:1 to 4:1 in this preparating conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios

Wang

Fan

et al. 2014

Int J Applied Ceramic Tech

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“…Magnesium phosphate cement (MPC)-based composites are favored with early strength and rapid solidification [4][5][6], small shrinkage [7,8], high adhesion to the old concrete [9][10][11], resistance to water [12][13][14][15][16][17], and strong chloride ion permeability [10,[18][19][20]. It can be coated over the new building structure or the old concrete structure for the purpose of protection.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of a Magnesium Phosphate Protective Layer on Concrete Structures in a Sulfate Environment

Huang

et al. 2018

Coatings

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This study investigates the resistance of an uncoated magnesium phosphate cement (MPC) protective layer to sulfate attacks through changes in its compressive strength and appearance. X-ray Diffraction (XRD) and scanning electron microscopy (SEM) microanalyses are conducted on the MPC layer concrete both before and after etching, where changes in the microstructure of the magnesium phosphate protective layer are analyzed during the corrosion process. In addition, this study also explores the intrinsic mechanisms of the MPC protective layer in terms of the resistance of concrete to sulfate. The results showed that the erosion resistance of the concrete to sulfate can be dramatically improved by the MPC protective layer. The structure and composition of the MPC protective layer are different in the sulfate erosion environment compared with those exposed to other environments: the protective layer is more closely bonded to the concrete and has a more compact structure. Therefore, the MPC protective layer is verified to have a significant protective effect on concrete against sulfate corrosion.

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“…According to foreign and domestic research, phosphate cement maintains a favorable strength development rate and bonding strength at the negative temperature given the robust heat of hydration . Besides, a low‐water–cement ratio of magnesium phosphate cement equates to a low‐binder–sand ratio and weak bonding strength with Portland cement . The addition of fly ash approximates the color of magnesium phosphate cement specimens to the color of Portland cement, thus reducing the cost of material, enhancing the fluidity of mortar, and reducing its bonding strength .…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10][11] Besides, a low-water-cement ratio of magnesium phosphate cement equates to a lowbinder-sand ratio and weak bonding strength with Portland cement. [12][13][14][15][16][17][18] The addition of fly ash approximates the color of magnesium phosphate cement specimens to the color of Portland cement, thus reducing the cost of material, enhancing the fluidity of mortar, and reducing its bonding strength. [19][20][21] However, repaired concrete is frequently eroded by acid rain, industrial wastewater, and other corrosive media during usage.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and property evolution of interfacial microregion of magnesium phosphate cement on mortar under various environments

Zhang

et al. 2018

Structural Concrete

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Portland cement specimens repaired with magnesium phosphate cement were soaked in Ca(OH)2 and Na2SO4 solutions for an extended period to test the bonding strength of the specimens. After the immersion, the fracture positions and surfaces of the specimens were observed and analyzed. Subsequently, the interfacial microregion of the specimens in different immersion periods was analyzed using an optical microscope and SEM. Besides, the microstructure and property evolution of the interfacial microregion of magnesium phosphate cement (MPC) on mortar under various environments were studied in erosion environment, which was compared with the interfacial microregion in natural environment. Results indicate that the bonding strength of the specimens is weaker in Ca(OH)2 solution than in the natural environment. At first, the bonding strength initially increases and then stabilizes with time. Moreover, the bonding strength of the specimens is weaker in Na2SO4 solution than that in the natural environment. The bonding strength initially increases and then decreases with time. In the natural environment, the crystal morphology in the interfacial microregion changes slightly, and the crystal structure becomes compact. In Ca(OH)2 solution, the crystal morphology in the interfacial microregion changes significantly, and the crystal structure becomes compact. In Na2SO4 solution, the crystal morphology in the interfacial microregion makes significant changes, and the crystal structure loosens.

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Research of magnesium phosphosilicate cement

Cited by 5 publications

References 0 publications

Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios

Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios

Microstructure Evolution of a Magnesium Phosphate Protective Layer on Concrete Structures in a Sulfate Environment

Microstructure and property evolution of interfacial microregion of magnesium phosphate cement on mortar under various environments

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Research of magnesium phosphosilicate cement

Cited by 5 publications

References 0 publications

Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH2PO4 Ratios

Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH2PO4 Ratios

Microstructure Evolution of a Magnesium Phosphate Protective Layer on Concrete Structures in a Sulfate Environment

Microstructure and property evolution of interfacial microregion of magnesium phosphate cement on mortar under various environments

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Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios

Curing Behavior and Structure of Magnesium Phosphate Chemically Bonded Ceramics with Different MgO to KH₂PO₄ Ratios