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HYDRATION OF THE SULFOFERRITE CLINKER IN THE PRESENCE OF DICALCIUM SILICATE

CONCRETE

UDC 666.9.035

Borisov, I. N. Dr. Eng. Sc., Prof., Shukhov Belgorod State Technological University, Russia

Grebeniuk A. A. candidate of technical sciences, senior lecturer, Belgorod State Technological University named after V. G. Shukhov, Belgorod, Russia

Alitinform №3 (60) 2020 г. 36-52 p.

Abstract

The article examines the effect of dicalcium silicate on the sulfoferrite clinker hydration and the structure of the cement stone formed on its basis. It is determined that an increase of the β-C2S content in binding sulfoferrite composition is accompanied by a reduction in the induction period of reactions during hydration and shortens the period of crystal hydrate formation from the moment of solidification. An increase of the amount of β-C2S in binding sulfoferrite composition contributes to a more intensive combining of dihydrate gypsum and accelerated formation of the ferrous ettringite phase during gyration. The changes in the morphology of ferrous ettringite formed glandular and formation of hydrosilicates of calcium are observed in the study of hydrated samples with increasing amounts of dicalcium silicate in the initial component composition. As a result, sizes of three sulphate forms crystal calcium hydrosulpoferrite become smaller, and area of formation of calcium hydrosilicates is shifted from the near-surface layer on the particles in the pore spaces between the crystallohydrate. The use of binding compositions as a part of mixed sulfoferrite cements provided a denser structure of the cement stone in comparison with the cement stone obtained which is based on Portland cement.

Key words:

sulfoferrite clinker, dicalcium silicate, bound sulfoferrite composition, hydration, ferrous ettringite, cement stone, mixed sulfoferrite cements

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