Abstract
A study on the use of amorphous metallic fibers (AMFs) in concrete was undertaken to combine its action with that of hooked-ended steel fibers for improving flexural strength and toughness. Tests on mixtures with various dosages of AMF (10, 20, and 30 kg/m³ [16.9, 33.7, and 50.6 lb/yd³]), and 15 kg/m³ (25.3 lb/yd³) of steel fibers were carried out, along with hybrid mixtures with two dosages of AMF. The results showed a significant increase in the flexural strength of concrete with the addition of AMF, even at low dosages. The performance of concretes with the hybrid combinations is significantly enhanced. For example, the equivalent flexural strength for the concretes with just 10 kg/m³ (16.9 lb/yd³) of AMF and 15 kg/m³ (25.3 lb/yd³) of steel fibers is 35% higher than with only steel fibers and is approximately 3.5 times that obtained with only 10 kg/m³ (16.9 lb/yd³) of AMF. The load-deflection behavior and the toughness parameters clearly indicate a significant synergy in the hybrid combination.
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