3 Questions
What is the characteristic strength of concrete?
The strength below which not more than 5% of test results fall
How is the strength of concrete at an age of less than 28 days used?
For demoulding and release of prestress
What does the coefficient in the equation for the strength of concrete at time t depend on?
The type of cement used
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.
"Test your knowledge on High-Strength Concrete and Eurocode 2 with our quiz! Explore the important properties of concrete, including compressive and tensile strengths, and deformational properties that affect long-term prestress retention. Discover the Eurocode 2's table of concrete properties and learn how to specify compressive strength in terms of characteristic cylinder strength fck at 28 days. Challenge yourself with questions on strength classes for concrete and the equation for calculating concrete strength at a given time. Take the
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