Memo 14 Days Concrete Testing

In this lab report to calculate the 14-day compressive strength of the concrete samples plus find the modulus of the elasticity along with the Poisson ratio .For this experiment the initial procedure to remove the for cylinder samples from the curing tank , and calculate the diameter of a specimen. The Compressive strength with the ASTM C39 set the concrete cylinder in the compression testing machine by the neoprene caps .The modulus of the elasticity plus the Poisson ratio of the ASTM C469 to calculating the compressive strength of the cylinder, and place the compressor meter for the remaining cylinder .The experimental investigations for the relative investigations among the elastics modulus, Poisson ratio, and the cylinder compressive strength of the concrete. Analyses of the test results represents the compressive strength plus the elastic modulus are related along with to increase the generally reflected to increase other.

Modulus of the elasticity is calculated by the Secant Modulus which is represent in the ACI 318: plot data “fit”. And the second method is Chord Modulus;

psi

Where: S₂ = Stress at 0.4 f’_c

S₁ = stress at a strain of 0.00005 in/in, e₂ = longitudinal strain at 0.4 f’_c, e₁ = 50.0 x 10^-6or 0.00005 in/in

The comparison of the Modulus of Elasticity (E) with the two empirical equations

psi

Poisson Ration of concrete is calculated, as per the ASTM C469

(Dimensionless),

Where, e_t2 = lateral strain at 0.4 f’_c ; e₂ = longitudinal strain at 0.4 f’_c ; e_t1= lateral strain at S₁           e₁ = 50.0 x 10^-6

It is recommended that, the Modulus of the elasticity, and the compressive strength, and the Poisson Ratio is calculated by the flowing formula which is explained as the above discussion.