Resumen de Structural behavior of sustainable lightweight Hollow-Core Slabs reinforced with fibers

Wael Jasim Mohammed, Nagham Tariq, Zainab M. Hussein

• A hollow Core Slab (HCS) is a concrete component with holes that distribute throughout the slab's span, intending to reduce weight and expense and provide a lateral advantage that can be used in electrical or mechanical systems, in addition to good thermal and acoustic insulation properties. This study's main objective is to study the structural behavior of HCS produced from sustainable lightweight aggregate concrete (LWAC) reinforced with chopped carbon fiber (CF) under symmetrical twopoint loads. Five Hollow Core Slabs containing crushed pumice stone as coarse Lightweight Aggregate (LWA) were casted including, three HCS specimens with CF as a variable; the first is a normal HCS specimen with 0% CF, the second HCS specimen is reinforced with 0.5% carbon fiber, and the third is HCS specimen reinforced with 1.0% CF, while the remaining two HCS specimens containing replacement of a Percentage of sand with a fine lightweight aggregate (RE) as a variable and 0.5% CF, one is HCS specimen with 10% RE and the other is HCS specimen with 30% RE.

  Load-deflection Relationship, the first cracking and the ultimate loads, and the ductility ratio of hollow Core Slabs were studied. The results indicate that the ductility ratio of the HCS specimen with 1% carbon fiber increased by 131.5% and also the deflection at ultimate load grew by 42.5% compared with the nonfibrous specimen. At the same time, the deflection at the ultimate load is increased by using the lightweight fine aggregate (LWFA) as a replacement with a percentage (10% and 30%) of sand by 21.23% and 36.1% respectively, as compared to HCS specimen without replacement and reinforced with 0.5% CF.