Jūros aplinkos poveikis hidrotechninio betono ilgaamžiškumui

Ramunė Lebedeva

Doctoral dissertation

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Hydrotechnical concrete structures located in the Baltic sea environment maintenance conditions, causes of the Baltic sea water and freezing and thawing cycles influencing concrete damages were analyzed in dissertation. Experimental research determined mineral additives (blast furance slag, limestone, coal burning fly ashes, silica fume) influence to hydrotechnical concrete properties and changes after affecting with solution of the Baltic sea water chemical composition and freezing and thawing cycles. Environmental conditions of the Baltic sea port water area and their effect on hydrotechnical concrete with different cements, mineral additives and coarse aggregates were researched and evaluated. Hydrotechnical concrete durability testing methodology was created after performed analysis of different factors like sorption and desorption, chloride diffusion, influence of freezing and thawing cycles to concrete of hydrotechnical structures.

Dissertation consists of introduction, three chapters, general conclusions, reference list and list of dissertation author’s academic publications.

Researched problem, work relevance are discussed, subject of research is described, work purpose and tasks are formulated, methods and its methodology, scientific work novelty, practical value and defensive statements are described in introduction chapter. Author’s academic publications and reports on dissertation topic posted in conferences, seminars, also dissertation structure is presented at the end of introduction.

First chapter is dedicated to analysis of literature. Conditions of maintenance of seaport structures concrete and reinforced concrete structures, hydrotechnical concrete degradation mechanism from cyclical freezing and thawing and effect of salts, influence of sea water to corrosive processes of concrete, influence of mineral additives to durability of hydrotechnical concrete, processes of chloride diffusion were described in a performed analysis of literature as well.

Materials and their properties used in the research, composition of concrete mixtures, research methods and used equipment, sample preparation, curing and testing methods were described in second chapter. The new original testing method of concrete resistance to the Baltic sea Environment is presented.

Results of research are presented in third chapter of dissertation such as damages of structures maintained in the Baltic sea Environment, strength characteristics of long time maintained concrete, and quantity of salts in it, influence of active mineral additives on hydrotechnical concrete properties, its sorbtion characteristics, chloride diffusion and durability.

Electronic version of the book:

DOI: https://doi.org/10.20334/2018-029-M

Book details

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Imprint No:
145×205 mm
170 p.
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