Properties of Concrete : (Part-1) _ STRENGTH PARAMETER #3

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1. Properties in Strength Parameter:  #3

          The following are the other two important properties of concrete in STRENGTH parameters and these should be noted down.

    D. FLEXURAL STRENGTH: It is a material property, defined as the Bending Stress which is maximum, that can be applied to the member before it "Yields" (member that can no longer resist Tensile Strength) in the bending test. 

             Flexural Strength is the measure of:
  • the Tensile Strength of the concrete member indirectly.   
  • the Maximum Bending Stress on the Tension zone of an Unreinforced (No steel) concrete beam at a point of Failure in Bending.
                                                                                                                                                                    
            Flexural Strength identifies:
  • the amount of Stress (N/mm2) and Forces (kN) of an unreinforced concrete beam which is capable of resisting any bending failures.
            Concrete member fails due to Tensile Stress before they fail under Compressive Stress.

          Wherever Flexural Strength appears just replace it with Bending Strength, Modulus of Rupture, Transverse Rupture Strength and Fracture Strength.

     E. SHEAR STRENGTH: Before learning Shear Strength, better to know about the following points; 

                      What is SHEAR?

                     The Shear denotes a Force which acts perpendicular to the length of a Beam (or) Column. In simple words "a Force (or) Stress made a cut" in the member.

                      What is SHEAR FORCE?

                      The Shear Force acts parallel to the surface of a member, due to this a member may shear off completely. 

                       What is SHEAR STRESS?

                       The Shear Stress may occur within the object (or) in between two different objects.

                       The Shear Stress within an object will occur when a force parallel to the plane causes one plane of the material to want to slip against another, thus deforming the material.

                      The Shear Stress between two different objects occurs when a force pulls the object along the same plane as the face of the object is in contact with another object that is being pulled in the opposite direction.

                        What is SHEAR STRENGTH?

                        As per Civil Terminology, Shear Strength of a member against failure where the member fails in shear.

  • One must know the amount of load that a structure can support.
  • It is mandatory to understand the forces that are applied to a structure in different directions.

  • The usage of shear strength parameter 
    • the evaluation of bearing capacity is dependent on the shear strength in the design of foundations.
    • used in the design of retaining wall etc., 



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