Calcium Silicate Products with Crushed Building and Demolition Waste
Publication: Journal of Materials in Civil Engineering
Volume 12, Issue 4
Abstract
The suitability of crushed building and demolition waste as a raw material for the production of calcium silicate products has been determined. Therefore calcium silicate bricks have been produced by replacing the natural sand with crushed building and demolition waste of different sources. The mechanical properties of the bricks made with these wastes are comparable or, in some cases, even better than those of bricks with natural sand. The green shear strength of the bricks is higher. The amount of quartz and reactive SiO2 in the waste materials is high enough for the formation of tobermorite as a cementitious material between the grains. A negative aspect is the appearance of brown stains on the surface of the bricks when the waste materials are slightly contaminated with organic substances. This risk can be reduced when, besides the crushing of the waste, a washing process is also included.
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References
1.
Eden, W. ( 1997). “Herstellung von Kalksandsteinen aus Bruchmaterial von Kalksandsteinmauerwerk mit omhaftenden Resten von Därmstoffen sowie weitere Baureststoffe.” Forschungsvereinigung Kalk-Sand eV, Forschungsbericht, 86 (in German).
2.
Rademaker, P. D., and Reiman, V. ( 1994). “Autoclaving calcium silicate bricks.” ZKG, 11, 636–642.
3.
Schuur, H. M. L. ( 1996). “Enhancing the recycling of calcium silicate products.” NOH Rep. 9645 (in Dutch with English summary).
4.
Van Weesep, H. J. ( 1996). “Onderzoek toepassing recyclingbrekerzand in beton.” Directorate-General for Public Works and Water Management, Edition on Raw Materials, Rep. 1996/02 (in Dutch).
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 12 • Issue 4 • November 2000
Pages: 282 - 287
History
Received: May 16, 2000
Published online: Nov 1, 2000
Published in print: Nov 2000
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