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Wolfram Schmidt, H. J. H. Brouwers, Hans-Carsten Kuhne, Birgit Meng.Br>
The working mechanism of starch and diutan gum in cementitious and limestone dispersions in presence of polycarboxylate ether superplasticizers
Appl. Rheol. 23:5 (2013) 52903 (12 pages)
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Polysaccharides provide high potential to be used as rheology modifying admixtures in mineral binder systems for the construction
industry such as concrete or mortar. Since superplasticizers have become state of technology, today, concrete is
more and more adjusted to flowable consistencies. This often goes along with the risk of segregation, which can be effectively
avoided by adding stabilising agents supplementary to superplasticizers. Stabilising agents are typically based on polysaccharides
such as cellulose, sphingan gum, or starch. Starch clearly distinguishes in its effect on rheology from other polysaccharides,
mainly due to the strong influence of amylopectin on the dispersion and stabilisation of particles. Based on rheometric
investigations on cementitious and limestone based dispersions with different volumetric water to solid ratios, the
mode of operation of modified potato starch is explained in comparison to a sphingan gum. It is shown that the stabilising
effect of starch in a coarsely dispersed system is mainly depending upon the water to solid ratio and that above a certain particle
volume threshold starch mainly affects the dynamic yield stress of dispersions, while plastic viscosity is affected only to
a minor degree. Sphingans operate more independent of the particle volume in a coarsely dispersed system and show significantly
higher effect on the plastic viscosity than on the yield stress. In systems incorporating superplasticizers, influences of
both stabilising agents on yield stress retreat into the background, while both observed polysaccharides maintain their effect
on the plastic viscosity.
► Cite this publication as follows:
Schmidt W, Brouwers HJH, Kuhne H-C, Meng B: The working mechanism of starch and diutan gum in cementitious and limestone dispersions in presence of polycarboxylate ether superplasticizers, Appl. Rheol. 23 (2013) 52903.
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