Flexural strength test

July 12, 2017
831 Views

Aim:

To determine the flexural strength of the given specimen

What is flexural strength?

Flexural strength, conjointly called modulus of rupture, bend strength, or fracture strength, a parameter for brittle material, is outlined as a material’s ability to resist deformation beneath load

Apparatus required:

  • Mould (15x15x70)
  • Tamping rod
  • Flexural testing machine

Procedure:

  • Prepare and the take a look at specimen by filling the concrete into the mould in three layers of roughly equal thickness. Tamp every layer thirty five times by using the tamping rod. Tamping ought to be distributed uniformly over the complete crossection of the beam mould and throughout the depth of every layer.
  • Clean the bearing surfaces of the supporting and loading rollers and subtract any loose sand or totally different material from the surfaces of the specimen where to make contact with the rollers.
  • Circular rollers factory-made out of steel having cross section with diameter thirty eight millimeter are going to be used for providing support and loading points to the specimens. The length of the rollers shall be a minimum of ten millimeter over the dimension of the take a look at specimen. a complete of 4 rollers shall be used, 3 out of that shall be capable of rotating on their own axes. The space between the outer rollers shall be in 3d and therefore the distance between the inner rollers shall be d. The inner rollers shall be equally spaced between the outer rollers, specified the complete system is systematic.
  • The specimen hold on in water shall be tested at once on removal from water; while they’re still wet. The take a look at specimen shall be placed within the machine properly focused with the longitudinal axis of the specimen at right angles to the rollers. For molded specimens, the mould filling direction shall be traditional to the direction of loading.
  • The load shall be applied at a rate of loading of four hundred kg/min for the fifteen.0 cm specimens and at a rate of one hundred eighty kg/min for the ten.0 cm specimens.

Formula:

  • fb = pl/bd2
  • fb = 3pa/bd2

Result: 

  • The flexural strength of concrete is=

 

 

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