Modification of the structure and Properties of Fine-Grained Concrete with Carbon Black Dispersion

The study shows that adding carbon black (soot) in the form of an aqueous dispersion into the composition of fine-grained concrete leads to an increase in bending and compressive strength of the samples: at a soot concentration of 0.005% by weight of cement, respectively, to 37.63 and 15.99%, at a c...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-09, Vol.603 (5), p.52012
Main Authors: Ivanovich Yakovlev, Grigory, Pavlovich Grakhov, Valery, Drochytka, Rostislav, Fedorovna Gordina, Anastasia, Vladimirovna Nikitin, Svetlana, Vyacheslavovna Begunova, Ekaterina, Fedorovich Buriyanov, Alexander, Anatolievich Repin, Alexander
Format: Article
Language:English
Subjects:
Aluminum oxide
Bend strength
Carbon
Carbon black
Cement hydration
Composition
Compressive strength
Concrete
Crystal structure
Differential thermal analysis
Dispersion
Soot
Spherulites
Tricalcium aluminate
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Summary:The study shows that adding carbon black (soot) in the form of an aqueous dispersion into the composition of fine-grained concrete leads to an increase in bending and compressive strength of the samples: at a soot concentration of 0.005% by weight of cement, respectively, to 37.63 and 15.99%, at a concentration of 0.02% up to 26.39 and 26.39% due to compaction of the structure of the cement matrix. An intensification of cement hydration processes has been noted, confirmed by the results of IR-spectral, differential-thermal analyses and studies of the cement matrix microstructure in the composition of fine-grained concrete. On the surface of new formations in the composition of modified soot dispersion, the formation of needle-like crystals has been observed. On their surfaces, structures of spherulites formed with sizes ranging from 100 to 200 nm, which are typical for calcium hydro-sulfonic aluminates of 3CaO·Al2O3·3CaSO4·32H2O type. The formation of spherulites is observed in the pores of the cement matrix, which contributes to additional compaction of the structure of fine-grained concrete.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/603/5/052012