The Relationship between Retention Stability and Chemical Structure of PCE

This paper describes how the retention performance of concrete is highly influenced by external parameters such as cement type, water content, materials, temperature and so on which sometimes appears to be a problem for ready-mixed concrete producers. The influences of the molecular structure and functional groups of PCE superplasticizers on the retention performance in terms of external changes were studied. In the course of the investigations the paper focused on the slump-loss-controlling agent with release compound (SLCA) and a common PCE with shorter polyethylene oxide chains. It was found that the retention ratio of the SLCA was much less affected by changes of temperature and mixing time, but the retention ratio of both superplasticizers was influenced by change of w/c. Superplasticizer SLCA with an additional release compound showed a much higher adsorption increase over time than the common selected PCE. The importance of the chemical structure of polycarboxylated superplasticizer to the retention stability could be related to the adsorption mechanism. At the same time a lower retardation effect on the setting time could be observed for the SLCA superplasticizer.

• 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:
  • Goller, Frank
  • Dikty, Stefan
  • Hamada, Daisuke
• 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; References; Tables;
• Pagination: pp 249-260
• Monograph Title: Superplasticizers and other Admixtures in Concrete

Subject/Index Terms

• TRT Terms: Adsorption; Chemical stability; Concrete; Moisture content; Polycarbonates; Superplasticizers; Water cement ratio; Workability
• Uncontrolled Terms: Polycarboxylates; Slump loss
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01159934
• Record Type: Publication
• ISBN: 9780870313370
• Report/Paper Numbers: SP-262-18
• Files: TRIS
• Created Date: Jun 30 2010 6:53AM