The Role of Adsorption Energy in the Sulfate-Polycarboxylate Competition

This paper describes how the interaction between sulfates and polycarboxylate polymers has become a subject of much discussion and occasional concern over the past years. Laboratory studies have shown that sulfates may prevent some polycarboxylate polymers from adsorbing, which causes a reduction in flow properties of cementitious materials. This seems to have led to the belief that this phenomenon is generally true for all polycarboxylates. In fact, it depends very much on the detailed polymer structure. Examples of this will be shown both with flow examples on paste, and experiments by atomic forces microscopy that illustrate in a very convincing way that this competition does not always turn to the advantage of sulfate ions. Furthermore, it is discussed how the outcome of this competition is governed by variations in the adsorption energy of the polymers.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780870313370
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Flatt, R J
  • Zimmermann, Jorg
  • Hampel, Christina
  • Kurz, Christophe
  • Schober, Irene
  • Frunz, Lukas
  • Plassard, Cedric
  • Lesniewska, Eric
• Conference:
  • Ninth ACI International Conference on Superplasticizers and Other Chemical Admixtures
  • Location: Seville , Spain
  • Date: 2009-10-13 to 2009-10-17
• Publication Date: 2009

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 153-164
• Monograph Title: Superplasticizers and other Admixtures in Concrete

Subject/Index Terms

• TRT Terms: Adsorption; Competition; Polycarbonates; Polymers; Sulfates; Superplasticizers
• Uncontrolled Terms: Atomic force microscopy; Polycarboxylates
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01159878
• Record Type: Publication
• ISBN: 9780870313370
• Report/Paper Numbers: SP-262-11
• Files: TRIS
• Created Date: Jun 29 2010 7:23AM