Modulus of elasticity of concrete is defined as the ratio of the applied stress to the corresponding strain. Not only does it demonstrate the ability of concrete to withstand deformation due to applied stress but also its stiffness. In other words, it reflects the ability of concrete to deflect elasticity.
The higher the value of the modulus, the stiffer the material is. Thus comparing a high performance concrete will be higher, thereby making it a stiffer type of concrete.