Multilevel dispersive reinforcement of self-stressed concrete

Abstract

In the introduction the object of the research is specified – expansive concrete composite with multilevel disperse reinforcement. The review of literature sources on the topic of research in the field of concrete science in the following directions: dispersed reinforcement of concrete composites and self-stressed concrete has been carried out. The relevance of the multilevel approach in disperse reinforcement has been noted. It is noted that the concept of reinforcement of self-stressed concrete by fibers has not been fully implemented up to the present day. In most cases disperse reinforcement is primarily considered from the point of view of effectiveness in increasing the strength characteristics, and self-stressed concrete is used only as one of the modifications of the concrete matrix. In view of the fact that in the early periods of hardening of expansive concrete the parallel processes of active growth of ettringite crystals and the formation of C–S–H crystal interlock may lead to recessions, and in later periods – even to complete destruction of the structure, the use of disperse reinforcement as a limiter of uncontrolled expansion strains is a promising area for research. The aim of the work is to obtain a self-stressed concrete composite with multilevel disperse reinforcement with specified strength and deformation characteristics. In the main part of the work, the choice of the adopted reinforcing elements of self-stressed concrete is substantiated, taking into account the concept of multilevel reinforcement. The investigated concrete compositions with the description of the materials used and the research methods are given. The positive effect of multilevel dispersed reinforcement of self-stressed concrete has been experimentally confirmed. The results of compression and bending strength tests of specimens have been analyzed. The results of the research can be used at enterprises, as well as in educational and research institutions.