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Re: Modulus of Elasticity for concrete

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Following are the provisions of ACI 318-05 and ACI 318-05M:

ACI 318-05
8.5.1 — Modulus of elasticity, Ec , for concrete shall be permitted to be
taken as wc^ 1.5 x 33 (fc')^.5 (in psi) for values of wc between 90 and 155
lb/ft^3. For normal weight concrete, Ec shall be permitted to be taken as
57,000 (fc')^.5.

ACI 318-05M
8.5.1 — Modulus of elasticity, Ec , for concrete shall be permitted to be
taken as wc^ 1.5 x 0.043 (fc')^.5 (in MPa) for values of wc between 1,440
and 2,480 kg/m^3. For normal weight concrete, Ec shall be permitted to be
taken as 4,700 (fc')^.5.

Rizwan Mirza, CE
Lahore, Pakistan

On 3 June 2015 at 21:46, Lloyd Pack, P.E. <lloyd(--nospam--at)advantage-engineers.com>
wrote:

> Hello Thor,
> 
> I my copy of "Reinforced Concrete Design, 5th ed." by Wang & Salmon
> On page 15, they reference the modulus of elasticity as:
> 
> Ec = 0.043 x wc^1.5 x sqrt(fc')      (ACI 318-89M)
> 
> with wc in kg/m^3 and Ec and fc' in MPa
> 
> Then they reference Ec for normal weight concrete as:
> 
> Ec = 5000 x sqrt(fc')           (ACI 318-89M)
> 
> with Ec and fc' in MPA
> 
> Then they reference Ec for normal weight concrete as:
> 
> Ec = 15,000 x sqrt(fc')      (approximate)
> 
> with Ec and fc' in kgf/cm^2

Truncated 437 characters in the previous message to save energy.

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