| Abstract [eng] |
This master’s thesis is based on an experimental study of underwater concreting technology. The study investigated ways to find an alternative to the special admixture used for underwater concreting, replacing it with a conventional stabilizing admixture that increases the stability and cohesion of the concrete mix. The main objective was to determine the impact of a stabilizing admixture on the slump of the mixture and setting of concrete underwater and its influence on concrete’s physical and mechanical properties. The thesis was based on literature analysis and experimental studies. The literature analysis describes the field of concrete application, its advantages and disadvantages, the properties of the concrete mix, the methods used for placing the mix underwater, the physical and mechanical properties of the concrete, and an overview of the admixtures used. The experimental study includes reviewing the materials used in the research and the preparation of cementitious doughs and concrete mixes with different compositions. Tests were carried out on the spread ability of the cement dough and the flexibility of the concrete mix, the determination of the air content of the mix, the washout of fines from the concrete mix, and the formation of specimens in tap water, lagoon water and seawater. Determination of density, compressive strength and water penetration depth after hardening the concrete specimens. After the above tests, the results of the tests were evaluated. |
