MROZOODPORNOŚĆ BETONÓW ZE ZBROJENIEM ROZPROSZONYM

Abstract

The influence of different fibers (steel, propylene, microfibers) on the frost resistance of concrete elements was analyzed. Seven types of concrete specimens with various types of fiber reinforcement at 1,0 or 0,5% volumetric ratio were selected for test. Destructive de–icing salt impact in environment of cyclic freezing and thawing was determined based on the procedure of PKN – CEN/TS 12390 – 9: Testinghardened concrete – Part 9: Freeze–thaw resistance – Scaling. It was found that fibers are very important additives in concrete mixture. Frost resistance of concrete without this type of reinforcement is about five times lower than resistance of concrete with steel fibers. Moreover, frost resistance accompanying analyses such as absorbability, capillarity sorption was analyzed. Relationships between examined properties of concrete were noticed. All observations lead to comprehensive understanding of this important material.