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What is the characteristic strength of concrete?
What is the characteristic strength of concrete?
- The maximum strength of test results
- The strength below which not more than 5% of test results fall (correct)
- The strength above which not more than 5% of test results fall
- The average strength of test results
How is the strength of concrete at an age of less than 28 days used?
How is the strength of concrete at an age of less than 28 days used?
- For determining the deformational properties
- For demoulding and release of prestress (correct)
- For calculating the Eurocode 2 table of concrete properties
- For testing the compressive and tensile strengths
What does the coefficient in the equation for the strength of concrete at time t depend on?
What does the coefficient in the equation for the strength of concrete at time t depend on?
- The age of the concrete
- The deformational properties of the concrete
- The strength class of the concrete
- The type of cement used (correct)
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Study Notes
- High-strength concrete is used in prestressed concrete structures.
- Compressive and tensile strengths, as well as deformational properties, are important properties of concrete.
- Deformational properties affect long-term prestress retention.
- The Eurocode 2 provides a table of concrete properties.
- Compressive strength is specified in terms of characteristic cylinder strength fck at 28 days.
- Characteristic strength is defined as the strength below which not more than 5% of test results fall.
- Strength classes for concrete are quoted in terms of fck/fck, cube.
- The strength of concrete at an age of less than 28 days is required for demoulding and release of prestress.
- The strength of concrete at time t in days cured at 20oC is given by an equation involving a coefficient depending on the type of cement.
- Fig. 3.1 shows the variation of βcc with time for the three classes of cement.
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