Question

A project specifies a concrete strength of at least 3000 psi. Materials engineers will design the mix for

a strength higher than that. Calculate the required average compressive strength of the mix design if

the standard deviation is s = 350 psi. Estimate the modulus of elasticity of the concrete at the required

average compressive strength (the calculated strength, not the given strength).

Answer 1

3000 psi

s = 350 psi

Average compressive strength= $\frac{Force (F)}{Cross Sectional Area (A)}$

Average Compressive strength= $\frac{3000psi}{350 psi}$

Average Compressive strength= 8.57