In the article the impact of varying humidity conditions on selected strength properties of
hardened steel fibre-reinforced concrete (such as Young’s modulus and the compressive
strength of concrete) were analysed. The analysis shows that the value of the Young’s
modulus of concrete cured under 100% humidity conditions is the highest; 35% higher
compared to concrete hardening in the laboratory hall and about 18% higher than modulus
measured in the concrete samples maturing in the chamber. A much higher compressive
strength of approx. 25% was observed in samples hardening under 100% humidity conditions
than in the other two environments. It was also observed that the non-uniform distribution
of samples in the chamber and opening and closing the chamber during sample maturation
had an impact on the dispersion of the results and due to the coefficient of variation,
results can be even worse than in free-maturing samples.
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