Effects Of Polyethlene Oxide Chains On The Performance Of Polycarboxylate-Type Water-Reducers

Polycarboxylic water reducers (PCs) can interact with cement particles physically and chemically and can be used to solve a variety of concrete problems because of their higher water-reduction ratio and less slump loss. This article explores the effects of polyethylene oxide (PEO) chains on the performance of PCs, including the fluidity, Zeta potential and adsorption in cement paste, and performances of the copolymer in concrete. Results demonstrate that properties of the copolymer were affected by the length and density of PEO graft and block chains. Copolymers with some block PEO chains at a certain length and percent had good performances in water-reducing capability and fluid-retaining ability. The polymer adsorption rate in the ranges of 40 to 65% would be good for slump retention. The authors conclude that this kind of copolymers could be used as high-range water-reducers (for preparing high-flowability concrete) because of the effects of electrostatic repulsive force and steric hindrance.

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  • Authors:
    • Li, Chong-Zhi
    • Feng, Nai-Qian
    • Li, Yong-De
    • Chen, Rong-Jun
  • Publication Date: 2005-5

Language

  • English

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  • Accession Number: 01001310
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 27 2005 7:58AM