The modulus of elasticity is determined by subjecting the specimen to longitudinal vibration at their natural frequency that is why this is known as dynamic modulus. In this method either the resonant frequency through a specimen of concrete or pulse velocity travelling through the concrete is measured.
How do you determine the dynamic modulus of elasticity?
The dynamic modulus of elasticity is determined using fundamental resonant frequency according to relations given in standards . The results are compared to the modulus of elasticity obtained by correlation with compression strength.
Which of the following is a measure of dynamic modulus of elasticity of concrete?
Ultrasonic pulse velocity measures the dynamic modulus of elasticity which is higher than those determined by static method because the dynamic method is unaffected by creep.
What is dynamic modulus of elasticity definition?
Dynamic modulus (sometimes complex modulus) is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation). It is a property of viscoelastic materials.
What is modulus of concrete How is it measured?
The static elastic modulus of concrete is defined as a chord modulus from the stress-strain curve , with a first point at a strain level of 0.00005 ( ) and the second point at 40% of maximum stress ( ) as follows: It is of interest to compare dynamic elastic modulus and initial tangent modulus, which corresponds to a ...
What are dynamic properties of materials?
Dynamic properties of viscoelastic materials are generally recognized on the basis of dynamic modulus, which is also known as the complex modulus. Theoretically, it can be defined as the ratio of stress to strain resulting from an oscillatory load applied under tensile, shear, or compression mode .
What is Dynamic Poisson’s ratio?
The dynamic Poisson’s ratio can be determined experimentally and the physical situation of such test is completely different from that of static loading. The value of dynamic Poisson’s ratio is always higher than the static Poisson’s ratio; an average value is about 0.24 [7].
What is dynamic Young’s modulus?
By definition, the dynamic moduli of rock are those calculated from the elastic- wave velocity and density . The static moduli are those directly measured in a deformational experiment. The static and dynamic moduli of the same rock may significantly differ from each other.
What is static modulus of elasticity?
Static modulus of elasticity of concrete is defined as the slope of the stress-strain curve under uniaxial tension or compression loading . When we test a concrete specimen in tension or compression, the following stress-strain relation is observed.
Is Young’s modulus The modulus of elasticity?
Young’s modulus is a measure of the ability of a material to withstand changes in length when under lengthwise tension or compression. Sometimes referred to as the modulus of elasticity, Young’s modulus is equal to the longitudinal stress divided by the strain .
What is viscoelasticity as a material property?
In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation . ... Elastic materials strain when stretched and immediately return to their original state once the stress is removed.
What is the difference between Young’s modulus and storage modulus?
Young’s modulus is referred to as tensile modulus , which is totally different material property other than the storage modulus. The storage modulus refers to how much energy was stored by the material when subjected to oscillating loads.
What is the value of modulus of elasticity of concrete?
The elastic modulus of hardened cement paste is around 10 to 30 GPa and that of aggregate is between 45 to 85 GPa. Concrete generally have an elastic modulus varying between 30 to 50 GPa .
How do you calculate Young’s modulus of concrete?
- Initial tangent modulus = stress/strain.
- Tangent modulus at working stress= stress/strain.
- Secant modulus = stress/strain.
Is concrete strong in tension or compression?
Concrete is a non-linear, non-elastic and brittle material. It is strong in compression and very weak in tension. It behaves non-linearly at all times. Because it has essentially zero strength in tension, it is almost always used as reinforced concrete, a composite material.
What is maturity of concrete?
Concrete maturity is an index value that represents the progression of concrete curing . It is based on an equation that takes into account concrete temperature, time, and strength gain. Concrete maturity is an accurate way to determine real-time strength values of curing concrete.
