The Effect of Polycarboxylate-Based Superplasticizers on the Efficiency of Heat Treatment of Monolithic Concrete

Number of journal: 4-2023
Autors:

Kastornykh L.I.,
Kaklyugin A.V.,
Gikalo M.A.

DOI: https://doi.org/10.31659/0585-430X-2023-812-4-35-41
УДК: 691.32

 

AbstractAbout AuthorsReferences
The features of heat treatment of monolithic concrete with superplasticizers based on polycarboxylates are investigated. When designing the compositions of pumped concrete mixtures for concrete pumping technology, the provisions of directed concrete structure formation and technological factors that have a significant impact on the formation of optimal structures of an artificial conglomerate were taken into account. In the work, cements of various compositions and an active mineral additive, which is a waste of industrial production, were used. Polycarboxylate-based superplasticizers were used as water-reducing additives to ensure high connectivity and pumpability of mixtures. Modeling of concrete hardening acceleration processes was carried out in a laboratory steaming chamber according to the regimes that ensure that concrete achieves the required stripping strength in an economically reasonable time. It was revealed that the negative effect of high temperature, expressed in a decrease in the strength of concrete, is manifested to a greater extent for compositions with a high consumption of superplasticizer. It is established that in order to intensify the hardening of monolithic concrete with polycarboxylate-based superplasticizers, it is necessary to optimize its composition and heat treatment parameters. The duration of preliminary curing of concrete before heating should be consistent with the nature of the processes of structure formation of cement stone. To eliminate the negative effect of high temperature on the strength of concrete, the moment of the beginning of the thermal effect should coincide with the end of the induction (preparatory) period in the cement paste. Under the production conditions of monolithic concreting, the following heat treatment parameters are recommended: the duration of preliminary curing is not less than five hours, the temperature rise rate is not more than 10°C/h, the temperature of isothermal heating is not more than 50°C. The evaluation of the quality of heat treatment of monolithic concrete should be carried out according to the coefficient of heat treatment efficiency.
L.I. KASTORNYKH, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.V. KAKLYUGIN, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.A. GIKALO, Master’s student (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Don State Technical University (162, Sotsialisticheskaya Street, Rostov-on-Don, 344022, Russian Federation)

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For citation: Kastornykh L.I., Kaklyugin A.V., Gikalo M.A. The effect of polycarboxylate-based superplasticizers on the efficiency of heat treatment of monolithic concrete. Stroitel’nye Materialy [Construction Materials]. 2023. No. 4, pp. 35–41. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2023-812-4-35-41


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