Effect of step heat treatment modes on the physical-mechanical properties of concrete

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.164505

Keywords:

heavy concrete, solar heat treatment, heated air, step modes, compressive strength

Abstract

Heat treatment of waterproof heavy concrete samples using heated air in step modes is carried out. It is indicated that these experiments are an integral part of the research of the method of heat treatment of concrete and reinforced concrete products using the air heated in a solar energy collector (the products are in closed forms). It is noted that on cloudy days and in the cold period of the year, an electric heater is used.

It is emphasizedthat in certain cases, the time of intermittent clouds during the day will be relatively short, and it can be assumed that under such conditions the decrease in concrete hardening intensity due to the break in the heated air flow to the chamber will be negligible.

It is indicated that simulation of the air heating process in the solar energy collector is carried out using an infrared heater.

It is determined that the investigated step modes of heat treatment of heavy concrete with heated air give an opportunity to increase the compressive strength of concrete 1.59...1.76 times compared with hardening in air conditions. It is shown that the higher the heating intensity of the concrete of the studied composition during the first hour of heat treatment (in the range from 4 to 8 °С), the greater theconcrete compressive strength at 1 day.

It is recommended not to use an electricair heater for the purpose of energy saving in the warm period of the year in conditions of intermittent clouds.

It is found that in the investigated cases, concrete temperature after heat treatment in step modes after 4 hours 15 minutes was 30 °C, and concrete temperature after 22 hours of hardening in the chamber was 26.3...27.2 °C. It is specified that this concrete temperature at the end of hardening in the chamber indicates that relatively intensive hydration of cement occurs. It is recommended for similar cases to analyze the expediency of extending the period of concrete thermosetting in the chamber

Author Biographies

Tatiana Kugaevska, Poltava National Technical Yuri Kondratyuk University Pershotravnevyi ave., 24, Poltava, Ukraine, 36011

PhD, Associate Professor

Department of Heat and Gas Supply, Ventilation and Heat and Power Engineering

Viktor Sopov, Kharkiv National University of Civil Engineering and Architecture Sumska str., 40, Kharkiv, Ukraine, 61002

Doctor of Technical Sciences, Professor

Department of Physical and Chemical Mechanics and Technology of Building Materials and Products

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Published

2019-04-16

How to Cite

Kugaevska, T., & Sopov, V. (2019). Effect of step heat treatment modes on the physical-mechanical properties of concrete. Eastern-European Journal of Enterprise Technologies, 2(6 (98), 51–57. https://doi.org/10.15587/1729-4061.2019.164505

Issue

Vol. 2 No. 6 (98) (2019): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2019 Tatiana Kugaevska, Viktor Sopov

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