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Short-term properties of concrete

Modulus of elasticity, flexural strength and modular ratio of concrete. Reference: IS 456:2000 Cl. 6.2.2, 6.2.3.1, Annex B.

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# Grade
f_ck := 25 MPa
sigma_cbc := 8.5 MPa

# Properties
E_c := 5000*sqrt(f_ck/(1 MPa))*1 MPa = GPa
f_cr := 0.7*sqrt(f_ck/(1 MPa))*1 MPa =
m_r := 280/(3*sigma_cbc/(1 MPa)) =

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