With the Bending Drain it is possible to measure the shrinkage and bending of building materials. Also you may simulate with an electrical heating system a real floor heating.

In case of thicker layers such as a screed, the Bending Drain is able to measure different shrinkage of the surface and the underground of the material, i.e. the length and heigh of the sample mortar change. It is also possible evaluate the bending of the building materials. The drain is made of stainless steel with U-profile 1m long, in which the material test is placed.

In the U-profile the sample is fixed by two bolds. The sample length is 1000 mm. For the length and heigh changing measurement LVDT sensor are used. LVDT (Linear Variable Differential Transformers) is a contacting sensor that has a movable ferromagnetic core.

In the bottom of the drain a computer controls electrical heating unit (that is free programmable) it can simulate different temperature profiles over several days (the maximum temperature that is possible to reach is 70 °C). In this way it is possible simulate a real conditions. For example, it is possible to program a temperature profile over time like the following: rising the temperature after 7 days from 20°C to 60°C, holding it for 2 days, and coming down to 20°C again.

A foil made of neoprene is placed between the U canal and mortar and it avoids blocking of material, also when expanding materials are used. The container is static independent from the mortar which is supported by two well defined points. The Bending Drain has an Internet connection and an integrated data logger. During the measurement it is not required special PC. A network browser software, like the Internet Explorer or similar software, controls completely the instrument. All data are stored inside on non volatile memory for weeks or months. Just by one mouse click you can load the data directly into your Excel worksheet in a network.

 

 

Instrument able to measure the shrinkage and the inflection of building materials.