Characteristics of hardening of mechanically activated composite cements

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Resumo

Composite cement is a binder system containing a mineral component that improves the construction and technical properties of cement. During separate and combined grinding of composite cement components in a high-energy centrifugal impact mill the mechanical activation of the mineral additive is carried out and mechanocomposites are formed, affecting the hardening and properties of the finished product. Hydration schemes for composite cements of separate and combined grinding are proposed. It is shown that during the hydration of composite cements, X-ray amorphous calcium hydrosilicates and hydroaluminates are formed, which crystallize under nonequilibrium conditions according to the non-classical kvataron mechanism. This leads to the formation of a fractal structure of cement stone with high early strength.

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Sobre autores

M. Garkavi

Ural-Omega CJSC

Autor responsável pela correspondência
Email: mgarkavi@mail.ru

Doctor of Sciences (Engineering) 

Rússia, 89, building 7, Lenin Avenue, Magnitogorsk, 455037

A. Artamonov

Ural-Omega CJSC

Email: aav@uralomega.ru

Candidate of Sciences (Engineering) 

Rússia, 89, building 7, Lenin Avenue, Magnitogorsk, 455037

E. Kolodezhnaya

Institute for Integrated Development of Mineral Resources of the Russian Academy of Sciences

Email: kev@uralomega.ru

Candidate of Sciences (Engineering) 

Rússia, 4, Kryukovsky Tupik, Moscow, 111020

S. Dergunov

Orenburg State University

Email: dergunow79@mail.ru

Candidate of Sciences (Engineering) 

Rússia, 13, Pobedy Avenue, Orenburg, 460018

S. Serikov

Orenburg State University

Email: svserikov@list.ru

Engineer 

Rússia, 13, Pobedy Avenue, Orenburg, 460018

D. Khamidulina

Magnitogorsk State Technical University

Email: loza_mgn@mail.ru

Candidate of Sciences (Engineering) 

Rússia, 38, Lenina Avenue, Magnitogorsk, 455000

S. Nekrasova

Magnitogorsk State Technical University

Email: snek-mgn@mail.ru

Candidate of Sciences (Engineering) 

Rússia, 38, Lenina Avenue, Magnitogorsk, 455000

Bibliografia

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2. Fig. 1. Flat analogue of the structure of composite cement in the case of different (a) and identical (a) particle sizes [9]: A – mineral additive; B – clinker

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3. Fig. 2. Evolution of the structure of the powder mixture during mechanical processing [10]

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4. Fig. 3. Compressive strength of cement stone depending on the content of waste blast furnace slag: a – at the age of 1 day; b – at the age of 28 days

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5. Fig. 4. The influence of the type of cement on activity (Rнорм) and the strength of cement stone

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