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2.7.7 MODULAR RATIO Short term modular ratio is the modulus of elasticity of steel to the modulus of elasticity of concrete. Short term modular ratio = Es / Ec Es = modulus of elasticity of steel (2 x 10 5 N/mm2) Ec = modulus of elasticity of concrete (5000 x SQRT(fck) N/mm2) As the modulus of elasticity of concrete changes with time, age at loading etc the modular ratio also changes accordingly. Taking into account the effects of creep and shrinkage partially IS code gives the following expression for the long term modular ratio. Long term modular ratio (m) = 280/ (3fcbc) Where, fcbc = permissible compressive stress due to bending in concrete in N/mm2. 2.7.8 POISSON’S RATIO Poisson’s ratio varies between 0.1 for high strength concrete and 0.2 for weak mixes. It is normally taken as 0.15 for strength design and 0.2 for serviceability criteria. 2.7.9 DURABILITY OF CONCRETE Durability of concrete is its ability to resist its disintegration and decay. One of the chief characteristics influencing durability of concrete is its permeability to increase of water and other potentially deleterious materials. 16PDF Image | concretes that use polymers as a binder
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