| Abstract [eng] |
The final master's project analyzes the construction technology of monolithic concrete domes. The project includes the analysis of monolithic concrete domes’ construction technologies by distinguishing different formwork systems, and the comparison of the alternatives for torching different sides of the dome from inside and outside. Moreover, the project covers the revision of concrete dome-forming ideas’ development. The research part of the project includes the analysis of the coating technology influence on the determination of physical and mechanical properties of concrete samples as well as concrete durability, comparing the samples that were formed in the concrete mix production factory and on the construction site. Moreover, technological properties of concrete mix, determination of compressive strength, frost resistance, water impermeability, depth of water penetration into concrete samples, and determination of wear were determined and compared. All tests were performed in the KTU laboratory. The obtained research results show that the average density of the samples formed in the concrete mix production factory (further - T) is 2413kg/m3; the average density of samples formed on the construction site (further - TO) - 2301kg/m3. The average of the compressive strength results of the samples formed in the concrete mix production factory, T - 46.2 MPa; samples formed on the construction site, TO - 45.8 MPa. Average compressive strength after 200 freezing cycles: T - 4.6%; TO - 10%. Mass change after 200 freezing cycles: T - 0.6%; TO - (-2%). Water-resistance results: T and TO specimens correspond to the W8 mark. The water penetration depth results showed that both T and TO samples are waterproof. Abrasion results: samples formed in the concrete mix production factory, T - 10,01 cm3/50cm2; samples formed on the construction site, TO – 9,74 cm3/50cm2. The obtained results and the properties of the samples formed in different ways differ due to different formation and storage conditions. The specimens formed in the concrete mix production factory were compacted on a vibrating table perfectly and left to solidify in a laboratory immersed in water. The specimens formed on the construction site were spread into the mold without additional compaction and left to solidify under field conditions on the construction site. Due to these conditions, it was predicted that the properties of the samples formed in the concrete mix production factory should be better. It was proved by the results that were obtained after the tests. |
