ABSTRACT
ABSTRACT: The contribution deals with problems concerning the new technique of elimination early ages cracking in reinforced concrete walls of water treatment tanks. Slight prestressing, or rather sustained compressive stress (0.5÷ 1,0N/mm2) applied to young concrete after a few hours of setting prevents concrete walls from cracks caused by exothermal reactions and shrinkage of hardening concrete. Different technologies of prestressing: with bonded and unbonded, permanent and temporary, internal and external tendons are discussed. The results of investigations concerning the influence of the prestressing start time on the ability to regeneration of the microstructure of young concrete and on its strength and stiffenes necessary to withstand the prestressing force are presented and discussed in this paper.
