When is this schedule used?
- The early strength gain of many high performance mixes requires crushes before 24 hours.
- These mixes are used in a lot of construction applications requiring quick turnaround of formwork, or tensioning activities which are time-sensitive.
- Pre-24hr crushes generally involve keeping a lab open overnight and this can incur additional lab costs.
- Crushes can be omitted at your own discretion. It is common to remove any crushes falling on a Sunday, for example, due to lab opening hours.
How many samples are required?
28 samples (including 2 instrumented samples which should not be crushed)