employee
Rostov-na-Donu, Rostov-on-Don, Russian Federation
Rostov-na-Donu, Rostov-on-Don, Russian Federation
Rostov-on-Don, Rostov-on-Don, Russian Federation
Rostov-na-Donu, Rostov-on-Don, Russian Federation
employee from 01.01.2017 until now
Rostov-na-Donu, Rostov-on-Don, Russian Federation
student
Rostov-na-Donu, Rostov-on-Don, Russian Federation
UDK 69 Строительство. Строительные материалы. Строительно-монтажные работы
GRNTI 67.09 Строительные материалы и изделия
GRNTI 67.01 Общие вопросы строительства
OKSO 08.06.01 Техника и технологии строительства
BBK 38 Строительство
BBK 308 Монтаж, эксплуатация, ремонт машин и промышленного оборудования
BISAC TEC005000 Construction / General
The analysis of the influence of ultraviolet irradiation of building sand, which is a filler in a concrete mixture, on the dependence of the strength of concrete on the content of filler is carried out. With an increase in the content of sand due to the hydrophilicity of the surface of its particles in the mixture, the amount of free water required for the hydration of cement and the formation of cement stone decreases. Along with a decrease in the content of binder cement, this factor is an additional reason for a decrease in the strength of concrete with an increase in the content of sand. Ultraviolet irradiation leads to dehydration of the surface of the sand particles and the appearance of hydrophobic centers. As the hydrophobicity of the sand in the concrete mix increases, the content of free water available for cement hydration increases, and the strength of the cement stone increases. The change in the hydrophobicity of the surface of sand particles depending on the time of irradiation is non-monotonic. Therefore, there is an optimal UV activation mode that provides the greatest increase in concrete strength.
ultraviolet irradiation, particle surface, concrete mix, concrete strength
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