Practice Compressive Strength (9.1.1) - Topics in Hardened Concrete - Concrete Technology

Practice: Compressive Strength

Lesson 9.1.1Topics in Hardened Concrete

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10 questions

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6 sample questions

Question 1.
Define compressive strength in concrete.
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Think about what happens when concrete is pushed vertically.
Question 2.
What is a common standard test to measure compressive strength?
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This test uses what shape for the concrete sample?
3Question 3.
What is the term for the resistance of concrete to axial loads?
- a) Tensile Strength
- b) Compressive Strength
- c) Flexural Strength
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Remember the main strength criteria for concrete.
4Question 4.
True or False: A lower water-cement ratio tends to decrease the compressive strength of concrete.
- True
- False
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Consider how water affects concrete density.
Question 5.
If a concrete mix is designed with a water-cement ratio of 0.6, what would be the expected implications on its compressive strength compared to a design with a ratio of 0.4? Calculate the potential percentage difference if compressive strength at 0.4 is known to be 40 MPa.
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Refer to the impact of water-cement ratio discussed earlier.
Question 6.
You are tasked with designing a new concrete mix for a high-rise building that requires a minimum compressive strength of 80 MPa. Discuss the steps and considerations you would take in preparing this mix, including material selection and testing methods.
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Think about how factors talked about earlier can help enhance strength while meeting design criteria.

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