EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of EN 680 testing. This European standard specifies a method for measuring relative length changes due to drying (drying shrinkage) of autoclaved aerated concrete produced according to EN 771-4 or prEN 12602.
The shrinkage properties determined by this method are the conventional reference value drying shrinkage, the relative length variation between the two specified moisture contents. The total value of drying shrinkage is the relative length change due to drying from saturated to constant length under certain climatic conditions. Other drying shrinkage values can be determined, among other parameters, to meet other specified national requirements.
Prismatic test samples are cut from new production products. For conditioning, it is saturated with water at (72 ± 20)°C for at least 2 hours and then stored in sealed plastic for (24 ± 2) hours. They are then air-dried at (20 ± 2) °C and (45 ± 5) % relative humidity (drying time under reference shrink storage conditions) until a constant length is reached.
At the end of the conditioning period and at appropriate time intervals throughout the drying period, the length variations and masses of the test specimens are determined. Finally, the test samples are dried to constant mass at (105 ± 5)°C to determine the dry density of the autoclaved aerated concrete and to allow the moisture content of the test samples to be calculated from the difference at each measurement date.
The longitudinal axis of test specimens from a reinforced or non-reinforced component of the same mold should be perpendicular to the elevation direction and preferably in the longitudinal direction of the reinforced component. The longitudinal axis of the test samples taken from the unreinforced masonry units will be perpendicular to the elevation direction and preferably in the vertical direction of the unit corresponding to the unit height.
Test specimens may be prepared from specimens previously used for other tests, provided that they are cut at a distance of at least 150 mm from an area where visible damage or changes in normal structure and appearance have occurred.
EUROLAB assists manufacturers with EN 680 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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