The Effect of Carbon Black and Silica Fume on the Properties of Self-Compacting Concrete

In the course of the study, experiments were carried out to modify the self-compacting concrete (SCC)-mixture with silica fume in combination with carbon black dispersion. The purpose of the work was to study the technological parameters of the modified mixtures and the physical and mechanical properties of the mixtures in the hardened state. Based on the evaluation of the technological parameters of the studied SCC mixtures, the optimal composition containing 0.25% carbon black and 5% microsilica by weight of cement was established. The following parameters were set for this mixture: normal cone flow equal to 680 mm; t₅₀₀=3.1 s; solution separation 11.46%; visual stability index of the mixture – VSI0; lack of water separation; retention of properties for 120 minutes from the start of mixing the mixture (the flow of the cone changed from 680 mm to 510 mm). For a sample modified with microsilica and technical carbon in the amount of 5% and 0.25% of the cement mass, respectively, an increase in compressive strength by 17.1% on 28 days of hardening was also found compared to the control sample, due to the compaction of the concrete structure due to the introduction of fine particles and the manifestation of the pozzolan effect of microsilica.

Е.А. КARPOVA¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
G.I. YAKOVLEV¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
I.К. AVERKIEV², PhD student (This email address is being protected from spambots. You need JavaScript enabled to view it.);
М.А. VOLKOV¹, PhD student (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.V. KUZMINA¹, PhD student (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.A. KNYAZEVA¹, master (postgraduate student) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Kalashnikov Izhevsk State Technical University (7, Studencheskaya Street, Izhevsk, 426000, Russian Federation)
² Udmurt Federal Research Center (132, Kirova Street, Izhevsk, 426000, Russian Federation)

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