The comparison of really measured compressive strength static modulus of elasticity with table values stated in Eurocode 2 is essential part of the paper. Since the standard draws from modulus of elasticity - concrete strength class, the set compressive strengths will be classified in concrete particular classes. Experimental part was based on several concrete design compositions differing in particular input raw-materials. Monitored values were set with concretes in different ages with final value 180 days. The experiment tries to demonstrate the impossibility of static modulus of elasticity derivation from table values which do not match the present-date produced concretes.

This study addresses the issue of the resistance to high temperatures of lightweight concrete lightweighted with sintered fly ash aggregate. Lightweight concretes with different amounts of lightweighting and their properties after loading temperatures of 600, 800 and 1000 °C were investigated. In particular, the effect of high temperature on the mechanical properties of the concrete was determined on the test specimens, and the effect on the microstructure was investigated by X-ray diffraction analysis and scanning electron microscopy. It was found that there is an increase in compressive strength between 0 and 21% up to 800 °C, where the increase in strength decreases with increasing degree of lightening. At 1000 °C, the internal structure of the lightweight concrete destabilized, and the compressive strength decreased in the range of 51–65%. After loading at 1000 °C, the scanning electron microscope showed the formation of spherical-shaped neoplasms, which significantly reduced the internal integrity of the cement matrix in the lightweight concrete due to the increase in their volume. It was found that the lightweight concretes with higher lightweighting showed significantly less degradation due to higher temperature.

Production of SCC concrete involves using a higher amount of fine particles consisting primarily of using increased amounts of cement and one or more admixtures. Due to the economic performance of Portland cements, recently looking for ways to lower the environmental and economic burdens. The first production of SCC concrete production was recommended only cements CEM I. Now, the standards EN 206 specify such a requirement and therefore attempt to use cement CEM II and higher amount of admixtures. This paper points out the possibility of using blended cement CEM II in combination with admixtures and particular monitors rheological properties of fresh SCC concrete.

The article discusses the physical mechanical concrete properties of five different concrete recipes. The objective of the composition of the concrete is to use the lowest quantity of Portland cement by adding additives (fly ash, slag and limestone) and the various combinations.

The modulus of elasticity is one of the most important properties of the concrete in terms of elastic behaviour of a construction. This parameter is used for the estimation of construction deflections and for assumption of serviceability and calculation of construction deformation. The paper summarises the most important parameters which have essential influence on the development of concrete physical and mechanical properties and mainly on its modulus of elasticity.