Shrinkage
Mortras and concretes are changing its volume during setting and hardening. Many factors are influencing this mechanism:
- temperature changes
- drying
- van-der Waals forces between the small high surface particles
- growing and shape changing of crystals
- volume change of the aggregates
- ...and some other known and also already unknown reasons
If the concrete is still in the fluid state, volume change doesn't matter. (maybe you get, due to the shrinkage, some percent less cubic meters of concrete volume then ordered). If hardening begins, shrinkage and expansion will cause inner strains. If this strain is higher then the strength inner cracks or other may appear.
Schleibinger offers several instruments to measure this volume change from the early beginning with high precision.
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