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How to determine flexural strength of concrete

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 How to determine flexural strength of concrete

The flexural strength of concrete is determined by testing concrete beams of rectangular cross-section. The beams are supported at their ends and loaded in the middle. The loads are applied gradually until the beam fails. The flexural strength is the stress in the concrete at the time of failure.How to determine flexural strength test of 

.concrete

How to determine flexural strength of concrete
How to determine flexural strength of concrete

Introduction

The flexural strength of concrete is an important property that must be considered in the design of concrete structures. The purpose of this blog post is to explain how flexural strength is determined and what factors can affect it.

?What is flexural strength

Definition of flexural strength

Flexural strength of concrete is a measure of tensile strength for concrete. It is a measure of the ability of concrete to resist deformation under load. The flexural strength of concrete is determined by testing specimens in accordance with ASTM C 78.

Importance of flexural strength

Flexural strength is an important property of concrete because it is a measure of the ability of concrete to resist deformation under load. Flexural strength is used to design structures such as beams, slabs, and columns.

?How to test flexural strength of concrete

  • Purpose of the test

The flexural strength of concrete is an important property that must be determined in order to ensure the safety and performance of concrete structures. The purpose of this test is to determine the flexural strength of concrete by testing specimens that are cast in a standard mold and cured under standard conditions.

  • Apparatus needed

The apparatus needed for this test includes a flexural testing machine, a curing tank, molds, and other materials as specified in ASTM C78.

Procedure of the test

  • The procedure for test is as follows 

1) Specimens are cast in molds and cured in a curing tank at 73 ± 4°F (23 ± 2°C) for a minimum period of 28 days.

2) After curing, specimens are removed from the molds and placed in the testing machine.

3) The testing machine applies a force to the specimen at a constant rate until failure occurs.

4) The maximum load applied to the specimen is recorded along with other relevant data such as specimen dimensions and type of concrete used.

?What are the factors affecting the flexural strength of concrete

  • Age of concrete

One factor that affects the flexural strength of concrete is the age of the concrete. The younger the concrete, the lower the flexural strength. This is because the concrete has not had enough time to cure and harden fully. The older the concrete, the higher the flexural strength. This is because the concrete has had more time to cure and harden fully.

  • Quality of materials

Another factor that affects flexural strength is quality of materials used in making concrete mix . If a lower quality cement is used, or if there are impurities in other ingredients, it will generally result in lower flexural strength.

  • Mixing of concrete

The manner in which concrete ingredients are mixed together can also affect flexural strength. If ingredients are not properly proportioned, or if they are not mixed together thoroughly enough, it will usually result in a lower flexural strength.

Conclusion

The flexural strength of concrete is an important property that needs to be considered in the design and construction of concrete structures. There are several methods available for testing the flexural strength of concrete, but the most commonly used method is the four-point bending test. The four-point bending test is a simple and straightforward test that can be easily conducted on site. The results of the test can be used to determine the flexural strength of concrete.

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