Estimation of the bending stiffness of rectangular reinforced concrete beams made of steel fibre reinforced concrete

Influence of steel fibres addition on mechanical and selected rheological properties of steel fibre high-strength reinforced concrete

“…The collected results were used to establish the theoretical relation between the maximum/peak specific creep of fibre reinforced concrete and time and load intensity. The knowledge of creep strain is particularly important in estimating long-time deflection of fibre reinforced concrete beams [8].…”

“…The main aim of the investigations into the rheological properties was to determine the creep strains whose knowledge is essential to, e.g., estimate the long-term deflections of beams [8]. Since the creep tests were carried out on uncovered specimens it was necessary to determine the total shrinkage strains without separating them into autogenous shrinkage strains and drying shrinkage strains.…”

X-ray computed tomography of fibre reinforced self-compacting concrete as a tool of assessing its flexural behaviour

“…The main obstacle in successful implementation of SFR-SCC in civil engineering is the lack of thorough analysis of fibre distribution (especially when considering thin elements [8,23]). The results of a few research programmes dealing with SFR-SCC [6,7,24,26,37] prove that fibre distribution in such structural elements varies due to the type of casting process, the flow rate, the wall effect, the location of concrete casting point (CCP), the thickness of elements and the proximity to the bottom of moulds. Variations in fibre distribution in case of SFR-SCC can be higher compared to traditional SFRC.…”

City sewer collectors biocorrosion

“…The obvious aim was always "better concrete" [1][2][3][4][15][16][17]. The general material concept of polymer concretes covers -from the technological point of view -the process during which the monomers, oligomers, pre-polymers or polymers are introduced into the concretes mix and, if chemically active, undergo to polymerization or polycondensation, usually initiated by catalysts [2][3][4][5][6][7][8][24][25][26][27][28].…”

“…In this case, the polymer is introduced into the hardened cement concretes. The result of this is an extraordinary increase of the tightness, manifesting itself by tenfold or even twentyfold downfall of the absorbability, from 5% for unmodified concrete to 0.30% -0.15% for impregnated concretes [2][3][4][24][25][26][27][28][29][30][31][32][33].…”