Durability of Concretes with Compensated Chemical Shrinkage

Number of journal: 8-2019
Autors:

Panchenko A.I.
Harchenko I.Ya.
Vasiliev S.V.

DOI: https://doi.org/10.31659/0585-430X-2019-773-8-48-53
УДК: 666.972

 

AbstractAbout AuthorsReferences
The durability of concrete under atmospheric impact to a significant extent depends on the level of defects in its structure. In turn, the degree of defectiveness is a consequence of its own deformations and the nature of the resulting own stresses. The ability to control the processes of its own deformations, and in particular chemical shrinkage, provides an opportunity to reduce the level of defectiveness of concrete and ensure its required durability. In the given classification of own deformations, special attention is paid to chemical contraction and chemical expansion. The method for determining the values of general and external contraction is described. It is shown that it is possible to reduce or eliminate the negative effects of chemical contraction by using sulfoaluminate expansion additives to cement when preparing the concrete. By changing the amount of the expanding additive from 8% to 11% by weight of Portland cement, it is possible not only to significantly reduce the external contraction, but also to provide a small expansion of the cement stone, which will lead to the appearance, albeit small values, own compressive stresses. The use of sulfoaluminate expansion additives provides a significant reduction in tensile stresses in the structure of concrete, which helps to reduce the level of defectiveness of concrete, and this in turn provides an increase in the quality of the contact zone of the cement stone with the filler, an increase in frost resistance by two and more times and water impermeability by more than three times.
A.I. PANCHENKO, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
I.Ya. HARCHENKO, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
S.V. VASILIEV, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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For citation: Panchenko A.I., Harchenko I.Ya., Vasiliev S.V. Durability of concretes with compensated chemical shrinkage. Stroitel’nye Materialy [Construction Materials]. 2019. No. 8, pp. 48–53. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2019-773-8-48-53


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