The development of high performance concrete has been progressive over the years. Many decades ago, concrete with a compressive strength of 5000 psi was considered high strength. Currently, compressive strengths are approaching 20,000 psi. High-strength concrete is predominately used in the columns of high rise buildings. It is also used in bridge girders, offshore drilling structures, and dams.

The modulus of elasticity is a very important mechanical property of concrete. The higher the value of the modulus, the stiffer the material is. Thus, comparing a high performance concrete to a normal strength concrete, it is seen that the elastic modulus for high performance concrete will be higher, thereby making it a stiffer type of concrete. Stiffness is a desirable property for concrete to have because the deflection a structure may experience will be decreased. However, deformations, such as creep, increase in high strength concrete (Neville 608).

The modulus of elasticity of concrete is typically calculated from a
compressive strength test of a concrete specimen. From these strength tests,
stresses and strains are measured and plotted. The ratio between stress
versus strain on these diagrams* *is called the modulus of elasticity,
E. Since concrete typically does not act in a linearly elastic manner,
there exists no portion on the stress versus strain diagram where Hooke’s
law may be applied to find the modulus of elasticity.

s = Ee Hooke’s Law

(where s = stress, e = strain)

Therefore, several ** methods**
are used to determine a value for the elastic modulus from a stress versus
strain diagram. There are also several

The following parameters can affect the value obtained for the modulus of elasticity:

Information compiled by Deborah Sipics.