Autoclave Treatment of Cement and Silicate-Matrix Concretes

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Title: Autoclave Treatment of Cement and Silicate-Matrix Concretes

Author(s): A. V. Satalkin, P. G. Komokhov, and I. P. Kromin

Publication: Special Publication

Volume: 32

Issue:

Appears on pages(s): 141-148

Keywords: au toclaving; binders (materials); cements; compressive strength, concretes; curing; lime; lime cements; magnesium oxides; modulus of elasticity; research; silica; silica brick; silicate concretes; silicon compounds.

Date: 7/1/1972

Abstract:
Autoclaved concretes using lime-silica binders can be made with strengths of 500-600 kgf/cm2 (7000-8500 psi) or more. Higher strengths are obtained with crushed stone than with sand and gravel aggregate, but concretes without coarse aggregate are more commonly made in the USSR. Although state standard specifications for autoclaved aproducts require that the limes used contain not more than 1 percent MgO, such pure limes are not available throughout the USSR. Concretes have been made in the laboratory using limes with MgO contents as high as 25 percent. Strengths of such concretes are lower, but with additives such as MgC12, CaC12, and NH4Cl these low strength levels can be improved considerably. Concretes made with magnesian limes have withstood more than 200 cycles of freezing and thawing. Reinforcing steel sometimes requires a protective coating to prevent cor-rosion.