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Mullite microsphere-filled lightweight calcium phosphate cement slurries for geothermal wells: setting and properties
The chemical factors affecting the setting properties of microsphere-filled lightweight calcium phosphate cement (LCPC) slurries, ranging in density from 1.32 g/cm3 to 1.12 g/cm3, at high hydrothermal temperature were investigated. The LCPC söurries consisted of calcium aluminate cement (CAC) as the base reactant, a -(-NaPO3-)-n solution as the acid reactant, and mullite-shelled hollow microspheres as the lightweight additiv. Two major aspects were studied; one was the importance of the chemical constituents of CAC, and the other was the rate of the hydrothermal reaction between the mullite shell and the Na ions dissociated from -(-NaPO3-)-n. For the former, the use of CAC having (2CaO)(Al2O3)(SiO2) and (CaO)(Al2O3) phases as the major chemical components shortened the thickening time of LCPC slurries, whereas CACs with (CaO)(Al2O3), (CaO)(2Al2O3), and alpha-Al2O3 phase components extended the thickening time. For the hydrothermal reaction, an excess of zeolite X type formed by the uptake of Na by mullite microspheres reduced the thickening time.
Mullite microsphere-filled lightweight calcium phosphate cement slurries for geothermal wells: setting and properties
The chemical factors affecting the setting properties of microsphere-filled lightweight calcium phosphate cement (LCPC) slurries, ranging in density from 1.32 g/cm3 to 1.12 g/cm3, at high hydrothermal temperature were investigated. The LCPC söurries consisted of calcium aluminate cement (CAC) as the base reactant, a -(-NaPO3-)-n solution as the acid reactant, and mullite-shelled hollow microspheres as the lightweight additiv. Two major aspects were studied; one was the importance of the chemical constituents of CAC, and the other was the rate of the hydrothermal reaction between the mullite shell and the Na ions dissociated from -(-NaPO3-)-n. For the former, the use of CAC having (2CaO)(Al2O3)(SiO2) and (CaO)(Al2O3) phases as the major chemical components shortened the thickening time of LCPC slurries, whereas CACs with (CaO)(Al2O3), (CaO)(2Al2O3), and alpha-Al2O3 phase components extended the thickening time. For the hydrothermal reaction, an excess of zeolite X type formed by the uptake of Na by mullite microspheres reduced the thickening time.
Mullite microsphere-filled lightweight calcium phosphate cement slurries for geothermal wells: setting and properties
Mullit-mikrohohlkugelhaltiger Calciumphosphat-Leichtbetonslurry für geothermische Bohrlöcher: Abbindeverhalten und Eigenschaften
Sugma, T. (author) / Carciello, N.R. (author) / Nayberg, T.M. (author) / Brothers, L.E. (author)
Cement and Concrete Research ; 25 ; 1305-1310
1995
6 Seiten, 1 Bild, 3 Tabellen, 4 Quellen
Article (Journal)
English
Tonerdezement , Bindemittel , Zusatzstoff , Phosphat , Bergbau , Dichte (Masse) , Druckfestigkeit , Bergwerk , Dichte , Hydratisieren , Natriumphosphatbinder , Phosphatbinder , Calciumaluminatphosphat , Tonerdebeton , Pumpen , Hohlkugel , Mullit , hydraulisches Bindemittel , Zeolith , hydraulischer Zement , Calciumaluminatbinder , Wasserabbinden von Zement
| British Library Online Contents | 1995
Microsphere-filled lightweight calcium phosphate cements
| British Library Online Contents | 1994
Air-foamed calcium aluminate phosphate cement for geothermal wells
| Elsevier | 2004