Creep of claydite-concrete in a dry hot climate
Abstract
Abstract: This paper presents the features of long-term deformation of claydite-concrete in a dry hot climate. It is known that a dry hot climate is characterized by abrupt changes in temperature and humidity during the day and season. In a dry hot climate, an increase in the creep strain of concrete is observed on which the performance characteristics of reinforced concrete depend. The rapid increase in strength in the early stages of hardening and the development of microinstructions in the structure of concrete from daily and seasonal fluctuations in temperature and humidity significantly affect the development of creep deformations. They are about 1.5 times more than in normal conditions. Under natural conditions of a dry hot climate, the schedule for the development of concrete creep deformations does not have a smooth outline, with a monotonous decrease in time of the growth rate of deformations, characteristic of constant temperature and humidity conditions. In dry, hot climates, creep strain growth occurs predominantly in the warm season. Curves of creep deformation of concrete acquire a stepped development. The greater the difference between changes in temperature and humidity in the warm and cold seasons, the clearer the stepwise character of the development of creep deformations. The degree of influence of a dry hot climate significantly depends on the massiveness of the element. The smaller the cross-section of the element, the more pronounced the effect of temperature and humidity changes in a dry hot climate. The effect of cross-sectional dimensions and climatic conditions is most pronounced in the early life of the structures, and this effect decreases later. Creep deformations of concrete depend on the time of year the structures are loaded. All other things being equal, concrete loaded in the summer warmer season has the greatest creep deformations. Therefore, when calculating the creep deformations of concrete, it is necessary to take into account the actual relative and seasonal (monthly average) air humidity during the period of structural loading. To determine creep deformations, experimental studies have been carried out to determine creep deformation in a dry hot climate.