Modeling of Accelerated Hardening of Self-Compacting Concrete by Methods of Mathematical Experiment Planning

Studies have been performed simulating the processes of accelerated hardening of self-sealing concrete prepared on sulfate-resistant Portland cement with a polycarboxylate superplasticizer. As part of the concrete mix, construction waste was used – sand from crushed concrete as an enlarging component in an amount of 10% of the mass of fine aggregate. The Polyplast PC anionactive superplasticizer was used as a universal additive for precast and monolithic self-sealing concrete with a dosage consistent with the mineralogical and dispersed composition of sulfate-resistant Portland cement. For mathematical modeling of concrete hardening intensification processes, a two-factor simplex was adopted-a summarized plan on a hexagon inscribed in a circle, as the most convenient for solving prescription and technological problems of building materials science. The factors that most affect the physico-mechanical properties of self-sealing concrete after heat treatment were the duration of preliminary holding of concrete without coolant supply and the maximum heating temperature of concrete. During the implementation of the full factor experiment, the conditions of comparability were observed: a self–sealing mixture of the same composition was prepared, the rate of temperature rise was 10^оC/h, and the total duration of thermal exposure was 15 hours. It has been found that the presence of an anionactive chemical additive and a mineral additive, which is part of Portland cement, slow down the setting processes of cement paste and concrete mixture. It was revealed that the retarding effect of the “sulfate-resistant Portland cement-superplasticizer” pair is explained by the spatial effect of the chemical additive and the grain characteristics of cement containing an easily grindable mineral additive. It is proved that the application of methods of mathematical planning of the experiment makes it possible to comprehensively assess the influence of prescription and technological factors on the strength characteristics of heat-treated self-sealing concrete. It was found that for the studied self-sealing concrete on sulfate-resistant Portland cement, the holding time before applying the coolant should be 4.8 hours, and the maximum heating temperature of concrete should not exceed 48^оC.

L.I. KASTORNYKH, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.A. GIKALO, Graduate Student (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.),
I.A. SEREBRYANAYA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
D.V. KUZMENKO, Graduate 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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