Conclusions
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1.
Addition of polyethylene oxide (PEO) improves the rheological properties of concrete mixes: it increases their cohesiveness and homogeneity, reduces the water separation and segregation, and enables us to produce a mixture with a mobility which increases with time (up to 0.5–1.5 h) after preparation. The addition of PEO to high-mobility and casting concrete mixes is especially effective.
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2.
PEO can be added to a concrete mix in the form of a finely dispersed powder which is first mixed with cement, or as a solution in the mixing water.
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3.
The improvement of the rheological properties of the concrete mix depends on the dose of PEO, the molecular weight of the polymer, and the method of adding the additive to the concrete mix. It is best to add PEO with a molecular weight of over 3·106, to the extent of 0.005–0.1% (as a rule, 0.01–0.05%) of the weight of cement, in the form of a solution.
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4.
Addition of PEO has no practical effect on the mechanical properties of the concrete; however, it increases the homogeneity of its structure.
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Literature Cited
R. Davidson and M. Sitting, Water-Soluble Resin, New York (1968).
Transport and Supply of a Concrete Mix: British Patent No. 1349467, published 1974.
Compositions of Concrete Mixes and Their Additives: USA Patent No. 3788869, published 1974.
K. E. Fletcher and M. H. Roberts, “Effect of a polyethylene oxide admixture on the strength of concrete,” Concrete,5, No. 10 (1971).
Additional information
From the Editors. With regard to this article by B. M. Mazur, the editors do not think that the results can be recommended for adoption. They are publishing the article in order to draw the attention of engineers to the promise shown by research into water-soluble polymers as additives for improving the properties of concrete mixtures and concrete.
Translated from Gidrotekhnicheskoe Stroitel’stvo, No. 6, pp. 39–41, June, 1977.
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Mazur, B.M. Improving the rheological properties of concrete mixtures by adding polyethylene oxide. Hydrotechnical Construction 11, 606–609 (1977). https://doi.org/10.1007/BF02413421
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DOI: https://doi.org/10.1007/BF02413421