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230
Mechanical Properties of Ultra High Performance Concrete
Abstract:
A research program is conducted to evaluate the mechanical properties of Ultra High Performance Concrete, target compressive strength at the age of 28 days being more than 150 MPa. The methodology to develop such mix has been explained. The material properties, mix design and curing regime are determined. The material attributes are understood by studying the stress strain behaviour of UHPC cylinders under uniaxial compressive loading. The load –crack mouth opening displacement (cmod) of UHPC beams, flexural strength and fracture energy was evaluated using third point loading test. Compressive strength and Split tensile strength results are determined to find out the compressive and tensile behaviour. Residual strength parameters are presented vividly explaining the flexural performance, toughness of concrete.Durability studies were also done to compare the effect of fibre to that of a control mix For all the studies the Mechanical properties were evaluated by varying the percentage and aspect ratio of steel fibres The results reflected that higher aspect ratio and fibre volume produced drastic changes in the cube strength, cylinder strength, post peak response, load-cmod, fracture energy flexural strength, split tensile strength, residual strength and durability. In regards to null application of UHPC in India, an initiative is undertaken to comprehend the mechanical behaviour of UHPC, which will be vital for longer run in commercialization for structural applications.
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References:

[1] Association Fran├ºaise de Génie Civil (2002), "Interim Recommendations for Ultra High Performance Fibre-Reinforced Concretes".
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[9] Katrin HabelEmmanuel Denari'e Eugen Br¨uhwiler,2006 "Time dependent behaviour of elements combining ultra-high performance fiber reinforced concretes (UHPFRC) and reinforced concrete", Materials and Structures, Vol 39, pp:557-569
[10] D. Redaelli and A. Muttoni, 2007"Tensile Behaviour of Reinforced Ultra-High Performance Fiber Reinforced Concrete Elements". Symposium Dubrovnik,Concrete Structures - Stimulators of Development. pp. 267-274.
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[18] ASTM C 1609M-10, "Standard test method for flexural performance of fiber reinforced concrete".Richard, P. and Cheyrezy, M. H., (1994), "Reactive powder concretes with high ductility and 200-800 MPa compressive strength", ACI SP144, 24, 507-18.
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[20] RILEM (1985). "Determination of the fracture energy of mortar and concrete by means of three-point bend tests on notched beams". Materials and Structures, 18, 99-101. Prepared by TC50-FMC.
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