An experimental study on structural behaviour of reinforced cement concrete and pre-tensioned slab panels using high strength hybrid fiber self compacting concrete

Abstract

An experimental program is carried out to evaluate the effect of hybrid fibers on the structural behavior of high strength hybrid fiber reinforced self-compacting concrete (HSHFSCC) slab panels. For the present experimental work, 1200mm x 1200mm and 100mm thick slab panel specimens were cast with addition of hybrid fibers (steel and glass fibers) and the high strength self-compacting concrete (HSSCC) mix developed by complete replacement of river sand with quartz sand and by using micro silica and quartz powder as mineral admixture. The hybrid fibers i.e., glass fibers and steel fibers are varied from 0% to 1.5% of weight of powder content in mix. The slab panels with HSSCC mixes for reinforced cement concrete slabs (RCCS) are designed as per IS: 456 (2000) and pre-tensioned slabs (PTS) are designed as per IS: 1343 (2012). The slab panels are tested under loading frame to obtain the load and deflection characteristics, first crack load, ultimate load and comparative analysis is made between RCCS and PTS panels using the obtained results for various HSSCC mixes. Addition of hybrid fibers enhanced the first crack load and post cracking behavior. A marginal improvement in the ultimate load carrying capacity is observed. It is observed that the load carrying capacity of slab panels with hybrid fibers (1.0% steel fibers + 0.75% glass fibers) showed improved load carrying capacity compared to all other slab panels.