Influence of modification of the solid component on the properties of non-autoclaved aerated concrete

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.171012

Keywords:

cellular concrete, aerated concrete, solid component, calcite, polymorphic modifications, portlandite.

Abstract

This paper reports results of research into the modification of a solid component in the non-autoclaved aerated concrete with a lime-carbonate additive that contains calcium carbonate (calcite), calcium hydroxide (portlandite) and the additive with a plasticizing and accelerating effect in order to improve its strength. Based on an analysis of the scientific literature, it has been suggested that the properties of cellular concretes are defined by the character of a solid component. The object of research that we selected was the non-autoclaved aerated concrete with a density of 500 kg/m3. The list of raw materials and their characteristics is provided. The aerated concrete was molded at a fixed water demand corresponding to the spread of a mixture of 220 mm by a Suttard viscometer. In the course of experimental study we applied both standard and original test methods (mathematical-statistical methods, x-ray phase analysis, determining the equipotential field of the surface of samples of aerated concrete).

We have obtained the non-autoclaved aerated concrete with a modified solid component, which has a maximum compressive strength of 3.53 MPa corresponding to concrete of class C2 in line with current standard. The high strength is explained, based on data from an X-ray phase analysis, by the presence of crystalline phases, which are represented by stable new structures in the form of calcium carbonate and its modifications: vaterite ‒ μ-form of СaСO3, aragonite ‒ metastable form of СaСO3 and tobermorite gel.

 Based on the data obtained, we have constructed experimental-statistical models of the examined properties. A specific relationship has been established between the strength of non-autoclaved aerated concrete and the equipotential field strength. The research results have been implemented industrially for manufacturing articles from non-autoclaved aerated concrete, which are not inferior, in terms of strength, to its autoclaved analogs.

Author Biographies

Eugene Krylov, State Enterprise "State Research Institute of Building Construction" Preobrazhenska str., 5/2, Kyiv, Ukraine, 03037

Lead Engineer

Department of Reinforced Concrete Structure Manufacturing Technology

Volodymyr Martynov, Odessa State Academy of Civil Engineering and Architecture Didrihsona str., 4, Odessa, Ukraine, 65029

Doctor of Technical Sciences, Associate Professor

Department of Production of Building Products and Structures

Maksym Mykolaiets, State Enterprise "State Research Institute of Building Construction" Preobrazhenska str., 5/2, Kyiv, Ukraine, 03037

PhD, Head of Laboratory

Department of Reinforced Concrete Structure Manufacturing Technology

Olena Martynova, Odessa State Agrarian University Panteleimonivska str., 13, Odessa, Ukraine, 65012

PhD, Associate Professor

Department of Agrarian Engineering

Oleksandr Vietokh, Odessa State Academy of Civil Engineering and Architecture Didrihsona str., 4, Odessa, Ukraine, 65029

PhD

Department of Construction Management and Occupational Safety

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Published

2019-06-21

How to Cite

Krylov, E., Martynov, V., Mykolaiets, M., Martynova, O., & Vietokh, O. (2019). Influence of modification of the solid component on the properties of non-autoclaved aerated concrete. Eastern-European Journal of Enterprise Technologies, 3(6 (99), 53–59. https://doi.org/10.15587/1729-4061.2019.171012

Issue

Vol. 3 No. 6 (99) (2019): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2019 Eugene Krylov, Volodymyr Martynov, Maksym Mykolaiets, Olena Martynova, Oleksandr Vietokh

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