Cement type, aggregates and air content in concrete mixture influence on the fire resistance of concrete

Vytautas Jocius

Doctoral dissertation

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Fire resistance of concrete is an important factor for buildings structures fire safety – essential characteristics of buildings, it is defined on the basis of the following criteria: R – ability to withstand structural loads, E – conform to (satisfy) integrity and I – insulation characteristics for the fire resistance period given. During reinforced concrete structures design several criteria are taken into account, excluding, however, performance characteristics and components of concrete (e.g. composition of cement, characteristics of aggregates and air content in concrete mixture) which is used to make the structure.

There are a number of scientific researches carried out with various types of cement concrete to assess the damage caused to cement concrete structures. However, insufficient attention is being paid to the impact of the components of concrete – cements, aggregates and chemical admixtures having different influence on concrete properties. Concrete is a multi-component composite with a complex structure, which if exposed to a fire has numerous processes taking place in it – from heat transfer, water vapor migration to various   disintegrations of chemical compounds. The main objective of the researches carried out in the dissertation was to analyze the impact of the types of cement, aggregates and air content in concrete mixture on the fire resistance of cement concrete.

The dissertation consists of an introduction, three chapters, general conclusions, the list of references and author’s publications on the topic of the dissertation. The introduction reveals the investigated problem, the importance of the dissertation, describes the object of the research, describes the purpose and the tasks of the dissertation, the scientific novelty, the practical significance of results examined in the paper and defended statements. The introduction ends in presenting the author’s publications on the subject of the dissertation and presentations in conferences and defining the structure of the dissertation. The first chapter revises the literature used, defines the issues of the impact of high temperatures on the fire resistance of concrete and reinforced concrete structures. At the end of the chapter, conclusions are given and the tasks for the dissertation are formulated. The second chapter presents the materials used for the research, as well as the methodology and the equipment used. The third chapter presents peculiarities of destruction processes of concrete in high temperature and the impact of different types of cements, aggregates and air content on the fire resistance of concrete. At the end of the thesis, general conclusions are given.

Three articles on the subject of the dissertation were published and five reports on the subject of the dissertation have been presented in Lithuanian and foreign conferences.

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DOI: https://doi.org/10.20334/2017-044-S

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145×205 mm
138 p.
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