Mortars 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 Measurement Gauge
Measure the change in length of concret slabs or cylinders.
Schleibinger Measuring Bending Unit
Measures simultaneously the bending and shrinkage of building materials.
Schleibinger Shrinkage Cone
Laser based system for non-contact measurement of the early shrinkage of pastes.
Schleibinger Shrinkage Drain
Measures the long-time shrinkage and expansion of mortar and concrete.