Investigation of technological and performance characteristics of decorative concrete with disperse reinforcement

Rimvydas Moceikis

Doctoral dissertation

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The dissertation deals with properties of dispersive reinforced fine-grained finishing concretes (DASAB) with different aggregates (quartz sand, crushed granite, and conventional quarry sand), fibers (glass, basalt, carbon, polyvinyl alcohol) and mineral additives (SiO2 micro fume and metakaolin (MK)). The aim of this work is to develop dispersive reinforced concrete for production of prefabricated wall elements and to investigate the effect of fibers, aggregates and active mineral additives on the consistency and segregation of mixtures and the durability of the concrete surface.

The dissertation consists of an introduction, three chapters, general conclusions, used literature and lists of the author's publications on the topic of the dissertation, a summary in English and seven appendices.

The first chapter is devoted to the analysis of the literature. It provides information on DASAB production technologies and their development, the influence of different fibers on the physical and mechanical properties of concrete mix and hardened concrete. The durability mechanisms of these composites and the effect of various mineral additives on durability are also analyzed. At the end of the chapter, conclusions are formulated and the tasks of the dissertation are specified.

The second chapter describes the materials used in the research and their properties. The compositions of the investigated concrete mixtures are presented, the selected concrete mixing process and sample formation are described. Research methods and used laboratory equipment are discussed.

The third chapter describes the research of technological, mechanical properties and durability of DASAB composite. Data on the effect of fiber and crushed rock aggregates on the workability and segregation of concrete mix, as well as data on frost resistance studies with cement matrix-modifying MK and SD additives are presented. Using the research results, a dispersive reinforced concrete composite with a flexural strength of 10.1 MPa and a flexural strain energy of 1149 N/m was developed, which can be used for facade structures operated for at least 20 years in aggressive climatic conditions of the Baltic region, which are characterized by the effects of freezing and thawing cycles.

7 scientific articles were published on the topic of the dissertation: three in the peer-reviewed scientific journals, two in the publications of the Clarivate Analytics Web of Science database in Conference Proceedings, and two in the other conference proceedings. Seven papers on the topic of the dissertation were presented at scientific conferences in Lithuania and other countries.

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