What Is Flexural Strength Of Concrete & Why It Is Important?

To determine whether requirements are being met, the flexural strength of concrete measurement is performed.

Flexural strength of concrete measures how well a slab or beam constructed of concrete will withstand breakdowns caused by twisting without support. Flexural strength is measured using ASTM C 293 or ASTM C 78 methods. These readings are presented as MR. (Modules of Rupture). These MR values are between 10% and 20% of tensile strength, depending on how much coarse aggregate is used. The flexural rigidity of concrete beams is evaluated.

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Importance of flexural strength of concrete

  • To authorize and manage pavements in the field, some individuals use MR. In order to achieve the required design MR, a laboratory mix design based on flexural strength experiments may be required. Alternatively, a cementitious material composition may be chosen based on previous experience.
  • Flexural testing of structural concrete is extremely uncommon. When a company does not use flexural strength for field control to evaluate the quality of supplied concrete, compressive strength is usually practical and reliable.

Applications of concrete’s torsional strength

The following are some uses of the concrete test for bending strength:

  • Determining standards compliance
  • It is essential for the concrete mix’s composition.
  • Concrete for the construction of blocks and sidewalks is tested using this method.


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Testing for flexural strength: techniques

  • Beam specimens must be produced properly in the field. The pavement’s concrete is solid. Shake the sides and tap them to remove any air pockets before consolidating. To remove air pockets after rodding, prod the molds. Then, spade down the sides to combine for a higher slump. The beam sides must never be permitted to dry. Soak for at least 20 hours in wet limewater before testing.
  • For concrete flexural values up to 800 psi, the normal variation ranges from 40 to 80 psi. A measurement problem could be indicated by standard deviation values of more than 100 pressure. Low strength is most likely the product of testing errors or moisture differences inside a beam brought on by premature drying.
  • When a connection between flexural and compressive strength has been demonstrated in a laboratory setting, compressive strength can be determined using ASTM C 42 core strengths, which can then be compared to the desired value using the ACI 318 criteria of 85% of the specified strength for the average of three cores. It is impractical to saw pieces from a block for flexural testing. Saw beams are not recommended because they will greatly reduce the concrete’s determined flexural strength.


Concrete specimen size

  • According to ASTM, the specimen’s length cannot be greater than three times its depth and is 150 millimeters broad and deep.
  • According to Indian norms, the concrete has measurements of 150 mm in breadth, 150 mm in depth, and 700 mm in span.
  • As long as the highest aggregate dimension is 19 mm, it says measures of 100 mm in breadth, 100 mm in depth, and 500 mm in span may be used.
  • British guidelines call for square specimen cross-sections with dimensions of 100 or 150 millimeters and spans between four and five times specimen depth. However, it chose a sample with 750mm of length, 150mm of breadth, and 150mm of depth.


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Apparatus for evaluating the bending strength of concrete

  • Molds made of non-absorbing materials like cast, steel, or iron and measuring (150mmX150mmX 750mm)
  • Tamping sticks Large rod (16 mm in diameter and 600 mm in length) and tiny rod are both required by ASTM. (10mm diameter and 300mm long)
  • Testing device that can apply weights consistently without interrupting shocks
  • Scoop
  • Trowel
  • An accurate balance of 1g
  • Concrete mixer with power
  • Table vibration when compacting concrete in moulds with vibration




Flexural studies are greatly impacted by how the specimen is handled, prepared, and cured. Beams may be harmed when handled or transported from the office to the lab due to their weight. Letting a beam dry results in weaker bonds. The curing of beams must follow industry guidelines, and they must be checked while still damp. As a result of how challenging it is to satisfy each of these requirements on a jobsite, MR values are frequently inconsistent and frequently low. An abrupt decline in bending strength could be caused by a quick drying procedure.

Several state transportation agencies previously used flexural strength for task management and quality assurance of concrete paving, but are now moving to compressive strength or maturity principles. According to the data, a revision of current testing procedures is required. Furthermore, they assert that while the flexural strength test is suitable for laboratory and study assessments of the constituent parts and ratios of concrete, it is too sensitive to testing variations to be used as a basis for the approval or rejection of concrete in the field.


Flexural Strength Of Concrete

In the concrete business and among inspection and testing groups, traditional cylinder compression tests for concrete control and acceptance are much more prevalent. Flexure can be used in the construction, but ordering and accepting the concrete should be done using the appropriate tensile strength. Each experimental lot should undergo flexural and compressive testing in order to establish a link that can be applied to field control.

For building reasons, the flexural strength of concrete is crucial. A laboratory mix design based on flexure may be required because pavement builders use a hypothesis of flexural strength. The cement content may be chosen based on previous practice to create the necessary MR design. Few people attempt this test for structural concrete, but some also use MR for field control and the approval of sidewalks.


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Concrete’s tensile strength versus flexural strength

Concrete’s flexural strength measures how well a block or beam made of the material will hold up under bending-related fails, while its compressive strength refers to how much weight it can support before failing. Usually between 10% and 15% of tensile strength is flexural strength.




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