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MODULUS OF ELASTICITY OF HIGH STRENGTH CONCRETE
Abstract
Development of high strength concrete has been continuous over the years, its production becoming available at competitive prices to the construction industry, thus moving away from being a novelty product. Although high-strength concrete properties have been widely studied for nearly 100 years, currently available design standards for concrete structures contain stipulations based on research conducted on concrete with lower grades than those available today. The modulus of elasticity is a very important mechanical property of concrete and therefore is a key factor for estimating the deformation of structural elements and very important for structures that require strict control of their deformability. International codes propose a large variety of formulas to establish the relationship between modulus of elasticity and compressive strength. A research program has been carried out to establish the experimental values of modulus of elasticity according to Romanian Standard (STAS 5585), but also according to European Standard (EN 12390-13). Five classes of concrete were studied: C40, C60, C70, C80 and C90. Values obtained experimentally were compared with those obtained by calculation, taking into account the value of compressive strength. The influence of age on the modulus of elasticity is also discussed.
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References9
American Concrete Institute, State-of-the-Art Report on High Strength Concrete, ACI Manual of Concrete Practice, Part 1, 1997.
Măgureanu C., High strength/performance concrete, Cluj-Napoca, România, UT Press, 2003.
fib Bulletin 42: Constitutive modelling of high strength/high performance concrete, International Federation for Structural Concrete (fib), 2008.
Hegheș B., Ductility of high strength - high performance concrete, PhD Thessis, România, 2011
STAS 5585-71 Tests of concrete. Determination of the modulus of compressibility of concrete
EN 12390-13:2014, Testing hardened concrete - Part 13: Determination of secant modulus of elasticity in compression
EN 12390-4:2002, Testing hardened concrete Part 4: Compressive strength Specifications for testing machines, ASRO, 2002
EN 12390-3:2003, Testing hardened concrete Part 3: Compressive strength of test specimens, ASRO, 2003
EN 1992-1-1: 2004, Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings, pp. 30
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