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Materials 2016, 9(5), 330; doi:10.3390/ma9050330

Lime as an Anti-Plasticizer for Self-Compacting Clay Concrete

1
Institute of Construction and Infrastructure Management, Chair of Sustainable Construction, Swiss Federal Institute of Technology (ETH Zurich), Stefano-Franscini-Platz 5, Zürich 8093, Switzerland
2
Laboratory for Concrete/Construction Chemistry, Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland
3
Institute for Building Materials, Physical Chemistry of Building Materials, Swiss Federal Institute of Technology (ETH Zurich), Stefano-Franscini-Platz 3, Zürich 8093, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 3 March 2016 / Revised: 24 April 2016 / Accepted: 26 April 2016 / Published: 29 April 2016
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Abstract

This paper focuses on the modification of clay properties with inorganic additives to deflocculate and flocculate inorganic soil for the development of a material that would be as easy to use as the current concrete products, but with a much lower environmental impact. Considering that the rheological behaviour of clays is controlled by their surface charge, we first introduce potential determining ions to deflocculate the clay particles and to reduce the yield stress of the earth material. Their efficiency is characterized using zeta potential measurements and rheological tests. We then achieve the flocculation of clay particles by using natural minerals that slowly dissolve in the interstitial liquid and ultimately precipitate calcium silicate hydrate (C–S–H). The precipitation products are identified by X-ray diffraction and the consequences of this delayed precipitation are followed by oscillatory rheometric measurements. Finally, it is suggested that in this process, C–S–H precipitation is not used as a binding vector but as an anti-plasticizer that removes the inorganic dispersant additives. View Full-Text
Keywords: clay; C–S–H; rheology; environmentally friendly materials clay; C–S–H; rheology; environmentally friendly materials
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Landrou, G.; Brumaud, C.; Winnefeld, F.; Flatt, R.J.; Habert, G. Lime as an Anti-Plasticizer for Self-Compacting Clay Concrete. Materials 2016, 9, 330.

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