Dispersing Agents For Cement Based On Modified Polysaccharides

Superplasticizers are used to adjust the workability of concrete, in terms of flowing behavior and plasticity, cohesion, and viscosity. This workability is obtained both by the action of the plasticizers itself as well as the complete encapsulation of the aggregate grains with a paste consisting of a mixture of fine grains and water. Most superplasticizers are not biodegradable. This article reports on a study that investigated the use of dispersing agents for cement that are based on modified polysaccharides and thus are renewable raw materials. In the study, different starch and cellulose materials were partially depolymerized, giving limit-dextrins with DP-sub-w 50-300 and level-off-DP (LODP) celluloses with DP-sub-w 30-150. The dispersing agents were tested as mortar and concrete admixtures. The results show that partially hydrolyzed and sulfoethylated amylomaize starch (70% amylose) provides the most efficient dispersing agent. The authors conclude that these dispersing agents based on starch and cellulose have a dispersing performance that is in the range of conventional superplasticizers (i.e., polycarboxylate ethers), or even higher.

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  • Authors:
    • Vieira, M C
    • Klemm, D
    • Einfeldt, L
    • Albrecht, G
  • Publication Date: 2005-5

Language

  • English

Media Info

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Filing Info

  • Accession Number: 01001317
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 27 2005 8:12AM