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How to determine split tensile strength test of concrete

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How to determine split tensile strength test of concrete

The split tensile strength test of concrete is a test that determines the strength of concrete in tension. This test is important because it allows engineers to assess the ability of concrete to withstand forces that are applied to it in a splitting or cracking manner. The apparatus used in this test includes a split-cylinder mold, a loading frame, and an extensometer. The procedure for this test involves filling the mold with concrete, curing the concrete, and then applying a load to the specimen until it fails. The results of this test are used to determine the safety factor of concrete structures and to design appropriate reinforcement for these structures.

How to determine split tensile strength test of concrete
How to determine split tensile strength test of concrete

?What is split tensile strength test of concrete

Purpose of the test

The split tensile strength test is a laboratory test used to measure the tensile strength of concrete. The test is conducted by applying a compressive force to a cylindrical specimen of concrete until it fails in two halves. The maximum compressive force applied during the test is recorded and used to calculate the split tensile strength of the concrete.

Apparatus used in the test

The apparatus used in the split tensile strength test includes a compression testing machine, a split mold, and a set of calibration weights.

Compression testing machine: The compression testing machine is used to apply the compressive force to the concrete specimen. The machine consists of a frame, an actuator, and a load cell.

Split mold: The split mold is used to form the cylindrical concrete specimen for testing. The mold consists of two halves that are held together by clamps during casting and testing.

Calibration weights: Calibration weights are used to calibrate the compression testing machine prior to use. The weights are placed on the lower platen of the machine and raised until they rest on the upper platen. The calibration process is complete when the values displayed on the digital readout match those of the calibration weights.

Procedure of the test

The procedure for conducting the split tensile strength test is as .follows

1) Prepare the concrete mix according to specifications and pour into the split mold.

2) Allow the concrete to cure for 24 hours before removing from mold.

3) Center Specimen in compressiontestingmachineand secure with clamps (Be sure that Distal Endof Specimenis level with platens).

4) Apply loads at prescribed rateuntil failure occurs along axial plane (usually between 10-20 seconds).Record Max Load(Fmax), note type offailure,and release load fromSpecimenimmediately 5) Remove failedSpecimenfromtestingmachineand measureDiameterat point offailureto nearest 0.,1 mm 6) CalculateSplit Tensilestrengthaccordingto equation below 7) Repeat steps 3 through 6 for additional specimens as required by specification or standard

Where:

Fmax = maximum load applied to specimen (N)

d = diameter of specimen at point of failure (mm)

A0 = original cross – section area of a sample (mm2)

Importance of the split tensile strength test.

Significance of the test results

The split tensile strength test is important because it provides information about the concrete that can be used to determine its quality. The test results can be used to determine the amount of force required to break the concrete, and this information can be used to improve the quality of the concrete.

?How to determine the split tensile strength of concrete

  • Factors affecting the test results

One of the most properties of concrete is its compressive strength . This property is usually determined by the split tensile strength test. The split tensile strength test is a measure of the ability of concrete to resist splitting when it is subjected to tensile stresses. The test is performed by applying a force to a specimen of concrete, and measuring the amount of deformation that occurs.

There are several factors that can affect the results of the split tensile strength test. These include the type of aggregate used, the water-cement ratio, the curing conditions, and the age of the concrete.

  • Methods of calculating the split tensile strength

There are two main methods for calculating the split tensile strength of concrete:

The indirect method, which uses the compressive strength of concrete, and

the direct method, which uses the deformation caused by an applied force.

The indirect method is more commonly used, as it is less affected by errors in measurement. It involves dividing the compressive strength by a factor known as the modular ratio. The modular ratio is a measure of the elasticity of concrete, and varies depending on the type of aggregate used and the water-cement ratio.

The direct method involves measuring the deformation caused by an applied force, and calculating the split tensile strength from this measurement. This method is less common than the indirect method, as it is more affected by errors in measurement.

Conclusion

The split tensile strength test of concrete is a very important test that helps to determine the strength of concrete. The results of this test are very significant and can help to improve the quality of concrete. There are many factors that affect the results of this test, but the most important factor is the method of calculating the split tensile strength. There are two methods of calculating the split tensile strength, and each method has its own advantages and disadvantages.

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