文章基本信息

标题：Effect of step heat treatment modes on the physical-mechanical properties of concrete
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作者：Tatiana Kugaevska ; Viktor Sopov
期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2019
卷号：2
期号：6
页码：51-57
DOI：10.15587/1729-4061.2019.164505
语种：English
出版社：PC Technology Center
摘要：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
关键词：heavy concrete;solar heat treatment;heated air;step modes;compressive strength