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Concrete compressive strength develops over time and depends on water-cement ratio, curing, and aggregate quality. It's the primary design property.
Trinn-for-trinn guide
- 1Test at 7, 14, and 28 days to track strength gain
- 2Design strength (f'c) typically 28-day compressive strength
- 3Results guide concrete selection and timing of load application
Løste eksempler
Inndata
28-day test results: average 35 MPa
Resultat
Concrete rated f'c = 35 MPa
Typical structural grade
Vanlige feil å unngå
- ✕Using 7-day strength for design when 28-day is specified
- ✕Neglecting quality control testing effects
Ofte stilte spørsmål
Can concrete be loaded before 28 days?
Yes, but at reduced capacity. Strength at 7 days typically 60-70% of 28-day strength.
What affects concrete strength development?
Water-cement ratio (lower is stronger), curing temperature (warm speeds gain), and cement type.
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