Studies of strength mechanism in newly developed chemically bonded ceramics in the system CaOSiO2P2O5H2O

Jiashan Hu, Dinesh Kumar Agrawal, R. Roy

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Strength data are presented on totally new room temperature setting cements in CaO-SiO2-P2O5-H2O system. These compositions lie in the range of CaO:45-65, P2O5:29-50, SiO2:4-20 (wt.%) and were prepared by sol-gel techniques using calcium nitrate and lactate, phosphoric acid and Ludox as precursors. Pressed pellets of the calcined powders were hydrated for times ranging from 1 day to 90 days at room temperature, 85° and 100°C. Typical values of splitting tensile strength near 15 MPa were common at room temperature, and 28 MPa at 100°C; maximum strengths of 31 MPA were achieved at 100°C for 1 day of hydration in some compositions. Microstructural analysis by SEM, XRD and EDAX showed the presence of unusually well crystallized CSH-1, Ca-hydroxy apatite and a well crystallized hydrated silicocarnotite phase together with gels of CSH and/or CSPH. The high strengths are attributed to the ultrafine powders used and the formation of well developed gels of CSH and CSPH which serve as the bond interlinking with crysalline grains of Ca(OH)2, Ca-hydroxy apatite, CSH and CSPH.

Original languageEnglish (US)
Pages (from-to)103-108
Number of pages6
JournalCement and Concrete Research
Volume18
Issue number1
DOIs
StatePublished - Jan 1 1988

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phosphorus pentoxide
Hydroxyapatite
Powders
Gels
Phosphoric acid
Chemical analysis
Hydration
Temperature
Sol-gels
Energy dispersive spectroscopy
Calcium
Nitrates
Cements
Tensile strength
Scanning electron microscopy
4-(3-chlorophenylsulfanyl)piperidine

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

Cite this

Hu, Jiashan ; Agrawal, Dinesh Kumar ; Roy, R. / Studies of strength mechanism in newly developed chemically bonded ceramics in the system CaOSiO2P2O5H2O. In: Cement and Concrete Research. 1988 ; Vol. 18, No. 1. pp. 103-108.
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Studies of strength mechanism in newly developed chemically bonded ceramics in the system CaOSiO2P2O5H2O. / Hu, Jiashan; Agrawal, Dinesh Kumar; Roy, R.

In: Cement and Concrete Research, Vol. 18, No. 1, 01.01.1988, p. 103-108.

Research output: Contribution to journalArticle

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AB - Strength data are presented on totally new room temperature setting cements in CaO-SiO2-P2O5-H2O system. These compositions lie in the range of CaO:45-65, P2O5:29-50, SiO2:4-20 (wt.%) and were prepared by sol-gel techniques using calcium nitrate and lactate, phosphoric acid and Ludox as precursors. Pressed pellets of the calcined powders were hydrated for times ranging from 1 day to 90 days at room temperature, 85° and 100°C. Typical values of splitting tensile strength near 15 MPa were common at room temperature, and 28 MPa at 100°C; maximum strengths of 31 MPA were achieved at 100°C for 1 day of hydration in some compositions. Microstructural analysis by SEM, XRD and EDAX showed the presence of unusually well crystallized CSH-1, Ca-hydroxy apatite and a well crystallized hydrated silicocarnotite phase together with gels of CSH and/or CSPH. The high strengths are attributed to the ultrafine powders used and the formation of well developed gels of CSH and CSPH which serve as the bond interlinking with crysalline grains of Ca(OH)2, Ca-hydroxy apatite, CSH and CSPH.

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