Sage Journals: Discover world-class research

Abstract

The analysis of silicate anions present in Portland cement using the trimethylsilylation technique, using modifications to the original methods described by Lentz and Tamas, have provided contrasting results. The Lentz method yields a large proportion of high molecular weight polyorganosiloxane derivatives of cyclic and straight silicate anion species. The Tamas method indicates the presence of initially straight chain and later cyclic anions that condense on prolonged hydration to form multicyclic species based on a cyclic octamer. The polyorganosiloxanes were separated and identified using conventional chromatography methods and anisotropic solvent induced shift ¹H nuclear magnetic resonance. The susceptibility of the Lentz method to side reactions and the superiority of the modified Tamas method in reducing these reactions were demonstrated.

MST/691

Get full access to this article

View all access options for this article.

References

CURRELL

B. R.

and PARSONAGE

J. R.

: J. Macromol. Sci. Chem. A, 1981, 16, (1), 141–166.

LENTZ

C. W.

: Inorg. Chem., 1964, 3, (4), 574–579.

LENTZ

C. W.

: ‘The silicate structure analysis of hydrated Port-land cement’, Special Reports, Vol. 90, 269-283, Highways Research Board, Washington DC, 1966.

GOTZ

and MASSON

C. R.

: J. Chem. Soc. (London) A, 1971, 686–688.

TAMAS

F. D.

, SARKAR

, and ROY

: in ‘Hydraulic cement pastes - their structure and properties’ (Conf. Proc.), (ed. Maxwell

P. V.

), 55-72; 1976.

LAcHowsKt

E. E.

: Cem. Concr. Res., 1979, 9, (9), 337–342.

CURRELL

B. R.

, MIDGLEY

H. G.

, MONTECINOS

, and PARSONAGE

J. R.

: Cem. Concr. Res., 1985, 15, (5), 889–900.

PARSONAGE

J. R.

and VIDGEON

E. A.

: Mag. Res. Chem., 1985, 23, (9), 774–777.

HIRLJAC

, WU

Z. Q.

, and YOUNG

J. F.

: Cem. Concr. Res., 1983, 13, (6), 877–886.

10.

MOHAN

II and. TAYLOR

F. W.

: Cem. Caner. Res., 1982, 12, (1), 25–31.

11.

DENT-GLASSER

L. S.

, LACHOWSKI

E. E.

, and QURESHI

M. Y.

: Cem. Goner. Res., 1981, 11, (5-6), 775–780.

12.

LEA

F. M.

: ‘The chemistry of cement and concrete’, 319; 1970, London. Edward Arnold.

13.

CLAYDEN

N. J.

, DOBSON

C. M.

, and HAYES

C. J.

: J. Chem. Soc. (London) D Chem. Commun., 1984, 1396–1397.

14.

TAYLOR

H. F. W.

: J. Eng. Mol. Mater. Sci. Eng., 1981, 3, 429–449.

15.

TAYLOR

H. F. W.

: J. Am. Ceram. Soc., 1986, 6, (69), 464–467.

16.

CURRELL

B. R.

, MIDGLEY

H. G.

, PARSONAGE

J. R.

, SOUBHI

, and VIDGEON

E. A.

: Br. Polym. J., 1981, 13, 143–146.

Silicate anion analysis in Portland cement pastes

Abstract

Get full access to this article

References