Model of high-strength lightweight concrete

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Abstract

Modeling is a tool of scientific cognition that makes it possible, by replacing the object under study with its representation (model), to explore it and interpret the results on the object itself. Obviously, the material model should allow for the study of the influence of prescription factors on its properties (direct task) or, with established requirements for the material, determine the parameters of the model (values of factors) that ensure the achievement of established requirements (inverse task). In the course of the study, a compounding and structural model of high-strength lightweight concrete was developed, which is a system of equations that establish the relationship of structural parameters (geometric characteristics, compounding factors (component content) with the sedimentation rate and viscosity of the concrete mixture and the specific strength of concrete. The conducted modeling makes it possible to predict the properties of the concrete mixture and concrete on a hollow aggregate and establish boundary conditions to achieve the target values of key quality indicators. It has been established that an urgent task in the production of high-strength lightweight concretes is the development of compounding and technical solutions that provide a combination of high mobility and uniformity, which is explained by the value of I/C as a key control factor located in opposite optimization areas, and in order to achieve high specific strength of high-strength lightweight concrete, it is additionally necessary to regulate the adhesion of cement stone to a hollow filler.

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About the authors

A. S. Inozemtcev

National Research University Moscow State University of Civil Engineering

Author for correspondence.
Email: InozemcevAS@mgsu.ru

Candidate of Sciences (Engineering) 

Russian Federation, 26, Yaroslavskoe Highway, Moscow, 400074

E. V. Korolev

Saint Petersburg State University of Architecture and Civil Engineering

Email: korolev@nocnt.ru

Doctor of Sciences (Engineering) 

Russian Federation, 4, 2nd Krasnoarmeyskaya Street, Saint Petersburg, 190005

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Supplementary files

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2. Fig. 1. Model distribution of particle sizes (a) and wall thickness of a hollow core (b)

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3. Fig. 2. Dependence of viscosity of lightweight concrete mix on W/C with varying content of hollow aggregate

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4. Fig. 3. Sedimentation intensity of hollow aggregate in cement suspension (the sign “–” corresponds to the direction of particle movement opposite to the action of gravity, i. e. floating)

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5. Fig. 4. Dependence of the curvature of the curve of functions f1 (a) and f2 (b)

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6. Fig.

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7. Fig. 5. Dependence of the specific strength of lightweight concrete on the particle size and volume content of hollow aggregate

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8. Fig. 6. Effect of adhesion on the specific strength of lightweight concrete on hollow aggregate (Df=80 µm)

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