Hardened Concrete and Properties
- Strength of Concrete
- A Compressive Strength
- Flexural Strength
- Tensile Strength of concrete
- Strain And Stress Characteristics Of Concrete
- Creep Of Concrete
- Permeability Of Concrete
- Durability Of Concrete
- Acid attack
- Efflorescence
- Fire resistance
- Thermal Properties Of Concrete
- Microcracking Of Concrete
- Rheology Of Concrete
- Workability Of Concrete
A Compressive Strength
Of the various strength of concrete, the determination of compressive strength has received a large amount of attention because of the concrete is primarily meant to withstand compressive stresses. Cubes, cylinders, and prisms are the three types of a compression test specimen used to determine the compressive strength.The cubes are generally of 100 mm or 150 mm side, the cylinders are 150 mm diameter by 300 mm height, the prisms used in France are 100mm * 100 mm * 500 mm in size. The specimen is cast, cured and tested as per standards prescribed for such tests.
FLEXURAL STRENGTH
The determination of flexural tensile strength is essential to estimate the load at which the concrete members may crack. As it is difficult to determine the tensile strength of concrete by conducting a direct tension test, it is computed by flexure testing. Its knowledge is useful in the design of pavement slabs and air-field runway as flexural tension is critical in these cases. The modulus of rupture is determined by testing standard test specimens of 150mm *150mm*700mm over a span of 600 mm or 100mm*100mm*500 over a span of 400 mm, under symmetrical two-point loading.The tensile strength of concrete
Apart from the flexure test, the other methods used to determine the tensile strength of concrete can be broadly classified as a direct and indirect method. The direct methods suffer from a number of difficulties related to holding the specimen properly in the testing machine without introducing stress concentration and to the application of a uniaxial tensile load which is free from eccentricity to the specimen.
Even a very small eccentricity of the load will induce bending and axial force conditions and the concrete fails at apparent tensile stress other than the tensile strength. In the indirect method, generally, a compressive force is applied to a concrete specimen in such a way that the specimen fails due to tensile stresses induced in the specimen. The tensile stress at which failure occurs is the tensile strength of concrete.