Effect of step heat treatment modes on the physical-mechanical properties of concrete
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2019, Vol 2, Issue 6
Abstract
<p class="a"><span lang="EN-US">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.</span></p><p class="a"><span lang="EN-US">It is emphasized</span><span lang="EN-US">that 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.</span></p><p class="a"><span lang="EN-US">It is indicated that simulation of the air heating process in the solar energy collector is carried out using an infrared heater.</span></p><p class="a"><span lang="EN-US">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 the</span><span lang="EN-US">concrete compressive strength at 1 day.</span></p><p class="a"><span lang="EN-US">It is recommended not to use an electric</span><span lang="EN-US">air heater for the purpose of energy saving in the warm period of the year in conditions of intermittent clouds.</span></p><span lang="EN-US">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</span>
Authors and Affiliations
Tatiana Kugaevska, Viktor Sopov
Keywords
Related Articles
- EP ID EP666318
- DOI 10.15587/1729-4061.2019.164505
- Views 52
- Downloads 0
Technological features in obtaining highly effective hydrogel dressings for medical purposes
The new technology of formation of hydrogel dressings for medical purposes, containing particles of silver was developed. To obtain metal-containing composite hydrogels, we proposed a high-tech single-stage method, which...
Analysis of detection of ecological hazard based on computing the measures of current recurrence of ecosystem states
<p>Analysis of the early detection of an environmental hazard in ecosystems was performed. New measures of the current recurrence of states that allow their use for the early detection of an environmental hazard in ecosy...
Development of a model for determining a priority sequence of power transformers out of service
<p>The research is devoted to the development of a model and algorithm for making decisions on determining the priority of power transformers out of service. Reducing the reliability of EPS operation, caused by the objec...
Development of principles and methods for calculation of direct current hybrid contactors
<p>The study showed that we can implement the principle of current control of the main circuit of a hybrid DC contactor by introduction of a small-size transformer of current into it. It has two primary windings, the fir...
Development of the ñonverter structure that enables power supply to traction induction motors of mine electric locomotives from different levels of voltage
<p class="a">We have proposed an adjustable structure of the converter of energy of electric drive in the electrotechnical complex of a mine electric locomotive from power sources with different voltage levels ‒ from a c...