Rubber, a material with an extremely low Young's modulus. Young's modulus, which is also known as the elastic modulus, is a mechanical property of linear elastic solid materials. It defines the relationship between stress (force per unit area) and strain (proportional deformation) in a material. Young's modulus is named after the 19th-century British scientist Thomas Young.
https://en.wikipedia.org/wiki/Young%27s_modulus
A short period of drying can produce a sharpdrop in flexural strength .Many state highway agencies have used flexuralstrength but are now changing to compressive strengthor maturity concepts for job control and quality assur-ance of concrete paving. Cylinder compressivestrengths are also used for concrete structures.
http://www.nrmca.org/aboutconcrete/cips/16p.pdf
Elastic properties and Youngs modulus for common metals and alloys as cast iron, carbon steel and more. It is convenient to express the elasticity of a material with the ratio stress to strain, a parameter also termed the tensile elastic modulus or Young's modulus of the material. This is usually given the symbol-E. 1  Young's modulus can be used to predict the elongation or compression of an object.
http://www.engineeringtoolbox.com/young-modulus-d_773.html
The modulus of elasticity is known for a wide variety of structural materials, including metals, wood, glass, rubber, ceramics, concrete, and plastics. Ad. The modulus of elasticity describes the relationship between the stress applied to a material and its corresponding strain. Stress is defined as a force applied over a unit area, with typical units of pounds per square inch (psi) or Newtons per square meter — also known as pascals (Pa).
http://www.wisegeek.com/what-is-modulus-of-elasticity.htm
Modulus of elasticity, also known as elastic modulus or Young’s Modulus, is a measure of how a material or structure will deform and strain when placed under stress. Materials deform differently when loads and stresses are applied, and the relationship between stress and strain typically varies.
http://www.wisegeek.com/what-is-modulus-of-elasticity.htm
(Reference 3) NRMCA and the American Concrete Pavement As-sociation (ACPA) have a policy that compressivestrength testing is the preferred method of concreteacceptance and that certified technicians should con-duct the testing.
http://www.nrmca.org/aboutconcrete/cips/16p.pdf
CIP 16 - Flexural Strength Concrete WHAT is Flexural Strength ?Flexural strength is one measure of the tensile strengthof concrete. It is a measure of an unreinforced con-crete beam or slab to resist failure in bending.
http://www.nrmca.org/aboutconcrete/cips/16p.pdf
Modulus of elasticity describes the relationship between stress and strain when under these conditions. Elasticity is the ability of a material to return to its original state or dimensions after a load, or stress, is removed.
http://www.wisegeek.com/what-is-modulus-of-elasticity.htm
Agencies not using flexural strength for field con-trol generally find the use of compressive strength con-venient and reliable to judge the quality of the concreteas delivered.Beam specimens must be properly made in the field.Pavement concrete mixtures are stiff (1/2 to 2 1 / 2 -inchslump).
http://www.nrmca.org/aboutconcrete/cips/16p.pdf
They suggest also that, while the flex-ural strength test is a useful tool in research and inlaboratory evaluation of concrete ingredients andproportions, it is too sensitive to testing variationsto be usable as a basis for the acceptance or rejec-tion of concrete in the field.
http://www.nrmca.org/aboutconcrete/cips/16p.pdf
what is modulus psi
The modulus of elasticity describes the relationship between the stress applied to a material and its corresponding strain. The modulus of elasticity describes the relationship between the stress applied to a material and its corresponding strain, and psi is a unit, pounds per square inch.