Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Fly ash modified high strength magnesium phosphate cement
The microstructure and properties of fly ash modified magnesia phosphate cement (MPC) were studied in the present work. For the comparison purpose, reference specimens without incorporation of fly ash were also investigated. The effect of fly ash content on the properties of MPC was studied with two hard burnt magnesia materials with different MgO content and fineness. The results showed that fly ash could improve the bonding and compressive strength of MPC. It was found that fly ash content at 30 % to 50 % has the best improving effect on MPC, in spite of the two types of magnesia. However, due to the difference of MgO percentage and particle fineness of two hard burnt magnesia materials, MPC mortars with finer particle size and higher percentage of magnesia demonstrated higher compressive strength. Incorporation of fly ash did not retard the setting reaction of MPC, but decreased the total heat evolution of MPC. The hydrates and microstructure of MPC paste were examined by x-ray diffractometer (XRD), differential thermal analysis (DTA) and scanning electronic microscopy - Energy dispersive X-ray analysis (SEM-EDAX). The main products formed in MPC paste are crystalline of hexahydrate phosphate and amorphous species. It is believed that after fly ash was added to MPC, the reinforcement of strength comes both physically and chemically. The MPC modified by fly ash could be called a magnesium phospho-silicate cement.
Fly ash modified high strength magnesium phosphate cement
The microstructure and properties of fly ash modified magnesia phosphate cement (MPC) were studied in the present work. For the comparison purpose, reference specimens without incorporation of fly ash were also investigated. The effect of fly ash content on the properties of MPC was studied with two hard burnt magnesia materials with different MgO content and fineness. The results showed that fly ash could improve the bonding and compressive strength of MPC. It was found that fly ash content at 30 % to 50 % has the best improving effect on MPC, in spite of the two types of magnesia. However, due to the difference of MgO percentage and particle fineness of two hard burnt magnesia materials, MPC mortars with finer particle size and higher percentage of magnesia demonstrated higher compressive strength. Incorporation of fly ash did not retard the setting reaction of MPC, but decreased the total heat evolution of MPC. The hydrates and microstructure of MPC paste were examined by x-ray diffractometer (XRD), differential thermal analysis (DTA) and scanning electronic microscopy - Energy dispersive X-ray analysis (SEM-EDAX). The main products formed in MPC paste are crystalline of hexahydrate phosphate and amorphous species. It is believed that after fly ash was added to MPC, the reinforcement of strength comes both physically and chemically. The MPC modified by fly ash could be called a magnesium phospho-silicate cement.
Fly ash modified high strength magnesium phosphate cement
Durch Flugasche modifizierter hochfester Magnesiumphosphat-Zement
Li, Zongjin (Autor:in) / Ding, Zhu (Autor:in)
2003
10 Seiten, 9 Bilder, 1 Tabelle, 27 Quellen
Aufsatz (Konferenz)
Englisch
New High Early Strength of Magnesium Phosphate Cement
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High-Early-Strength Magnesium Phosphate Cement with Fly Ash
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Preparation method of modified magnesium phosphate cement
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