Which of the following tests compares the dynamic modulus of elasticity of samples of concrete?a)Compression testb)Ultrasonic pulse velocity testc)Split testd)Tension testCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

The correct answer is option 'B', the ultrasonic pulse velocity test. This test is used to compare the dynamic modulus of elasticity of samples of concrete. Let's take a closer look at what the ultrasonic pulse velocity test is and how it is used to determine the dynamic modulus of elasticity.

1. Ultrasonic Pulse Velocity Test:
The ultrasonic pulse velocity test is a non-destructive testing method used to assess the quality and integrity of concrete. It measures the time taken for an ultrasonic pulse to travel through a concrete specimen. This pulse travels through the material at a known velocity, and by measuring the time it takes for the pulse to travel a known distance, the velocity of the pulse can be determined. From this velocity, various properties of the concrete, including the dynamic modulus of elasticity, can be calculated.

2. Dynamic Modulus of Elasticity:
The dynamic modulus of elasticity is a measure of how well a material can deform elastically under dynamic loading, such as vibrations or seismic forces. In the case of concrete, it represents the ability of the material to withstand dynamic loads without permanent deformation. It is an important property to consider in the design of structures that will be subjected to dynamic loads.

3. How the Test Works:
In the ultrasonic pulse velocity test, two transducers are placed on opposite sides of the concrete specimen. One transducer emits an ultrasonic pulse, while the other receives it. The time taken for the pulse to travel through the concrete is measured, and the velocity of the pulse is calculated by dividing the distance between the transducers by the travel time. This velocity is then used to determine the dynamic modulus of elasticity using a suitable mathematical relationship or empirical formula.

4. Importance of the Test:
The ultrasonic pulse velocity test is widely used in the construction industry to assess the quality and strength of concrete. By comparing the dynamic modulus of elasticity of different samples of concrete, engineers can determine the suitability of the material for specific applications. This information can be used to optimize the design of structures and ensure their safety and durability.

In conclusion, the ultrasonic pulse velocity test is the appropriate test for comparing the dynamic modulus of elasticity of samples of concrete. This non-destructive testing method provides valuable information about the quality and strength of the material, allowing engineers to make informed decisions in the design and construction of structures.

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