High strength concrete (Hsc) and ultra-high strength concrete (uHsc) have become today highly required due to their enhanced properties in terms of strength and durability. An experimental program was executed at Bme, Department of construction materials and technologies in order to evaluate the mechanical properties of Hsc and uHsc mixtures including supplementary cementitious materials (scm) such as silica fume and metakaolin, to achieve the optimal mixture for site applications. compressive strength was evaluated at different ages. variable parameters were the amount of water, cement and scm. several alterations were performed to reach the required strength by the designers. Based on the laboratory experiment results, the most effective replacement amount of cement is 8% for sF and 17% for mk. keywords: compressive strength, high strength concrete, optimization, ultra-high strength concrete.
Supporting structures can be transparent nowadays due to the development of glass strengthening procedures. The building glass as a versatile building material supports architectural design due to its transparency. The paper focuses on load-bearing glass columns and also on the design, the load bearing capacity and the stability issues of fins. International and Hungarian case studies demonstrate the possible use of cross-sections, layers and supporting structures of glass columns [1]. Laboratory experiments were carried out at the BME, Department of Construction Materials and Engineering Geology on buckling of glass columns. More than 60 specimens where loaded until fracture. The load and deformations (buckling, surface deformations) were measured. Based on the experimental results, the critical force was determined and the fracture and stability processes were illustrated by force-deflection diagrams. The results were analysed with the calculation procedures in the focus of the international literature (results are presented separately in the 2nd part of the present paper series).
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