Maro Publications

Concrete

Patent Abstracts

*12/03/2013 
from 4/15/2013

Maro Topics

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Patent Abstracts

1. Superplasticizers

U.S. Patent 8,563,631 (October 22, 2013), “Viscosity-Reducing Super-Plasticising Copolymers,” David Rinaldi, Horacio Naranjo, Martin Mosquet, Philippe Maitrasse, and Alexandre Desseroir (Lafarge, Paris, France, and Chryso, Issy les Moulineaux, France).

Fluidity is critical in pouring concrete.  Water is frequently added to maintain fluidity from mixing to pouring.  Unfortunately adding water leads to mechanical degradation and cracking of the final concrete structure.  This is especially important for self-levelling concrete.  Polyalkoxylated polycarboxylate comb copolymers (PCPs) are super-plasticisers for concrete which maintain fluidity without additional water.  However, these mixtures are complex and difficult to control.  Rinaldi et al found that acrylic copolymers with mixtures of acid and hydrophobic groups improve consistency and simplify formulation.  Typical hydrophobic groups are oxypropylene and oxybutylene.  Their copolymers consist of a main chain of (meth)acrylic acid units with side chains of polyoxyalkylated groups.  These copolymers contain 1 to 8 wt% of statistically-distributed hydrophobic units.

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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Copyright 2013 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 4/15/2013.