Behavior of hybrid fibre reinforced self compacting concrete load bearing wall panels

Author(s): M. Chandrasekhar, M. Janardhana, M.V.S. Rao
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 1253 - 1264
Total Pages: 11
Language: English

Abstract: 
Fibre reinforced concretes were found to be improving the performance of the concrete and hybridization of fibres in the concrete was found to be more useful. The Self Compacting Concrete (SCC) was proved to be more eco-friendly, efficient and has exhibited improved performance when tested by introducing different types of fibres. The present studies are aimed at studying the behaviour of the self compacting concrete with the introduction of hybrid fibres. The hybrid fibres chosen are high dispersion glass fibres with an aspect ratio of 857 at a dosage of 0.024% by volume and the steel fibres content is 0.4% by volume having an aspect ratio of 30 to form Hybrid Fibre Reinforced Self Compacting Concrete (HFRSCC). It is observed that the inclusion of hybrid fibres in SCC has improved its mechanical properties like strength, ductility factor, plasticity ratio and modulus of elasticity. Using the results of the above mechanical properties, the stress-strain behaviour of HFRSCC was investigated under different confinements in the form of steel hoops with the percentage confinement varying from 0% to 1.591%. Strength enhancement ratios were also reported for both plain SCC and HFRSCC. Stress-strain models were developed in the form of single polynomial equations to predict the stress-strain behaviour. Subsequently, wall panels of 1500mm × 1000mm size and 75mm thick (model wall panels) were cast with SCC and HFRSCC mixes as developed and tested under vertical compressive load with minimum eccentricity of t/6 i.e 12.5mm. The experiments have shown that the load carrying capacity of HFRSCC panels has increased by 53% under minimum eccentric loading condition. These values are compared with theoretical load carrying capacities and found to be agreeing closely. Using these test results, the load carrying capacities of prototype wall panels are predicted by adopting principles of strength of materials.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00