Physical foundations of variatropia recipe regulation and control of concrete properties with centrifugal seal

Don State Technical University, 344000, Rostov-on-Don, Russia

^* Corresponding author: au-geen@mail.ru

Abstract

The features and mechanisms of the processes occurring during concrete centrifugation are considered. It was found that a significant difference in the centrifugal and centripetal forces acting on the outer, middle and inner layers of the cross-section leads to significant differences in the structure and characteristics of the element layers. The possibility of regulating the variatropia and controlling the concrete properties during centrifugal seal by regulating the prescription factors is considered. The forms of various aggregates’ interaction with cement stone and the mixture components’ separation features during centrifugation are analyzed. Based on the analysis data, it is proposed to use a combination of various types aggregates and densities in centrifuged concrete. The main types of fibers are identified and the analysis of the effectiveness of their use is carried out. On the basis of the performed analysis, the most promising way of increasing the efficiency of fiber-concrete centrifuged elements was determined, namely, the combination of two or more types of fibers. The most expedient combinations of the aggregates and fibers’ types have been identified, which makes it possible to guarantee the directional movement of the components of the concrete mixture during centrifugation. In terms of the aggregate, this is the use of a large aggregate with a high density and a fine aggregate with a lower density, and in terms of fibers, it is a combination of steel and non-metallic fibers.