Experimental procedure for non-destructive testing of concrete layer adhesion by means of vibration measurement

we have carried out two series of experiments.The first one is an experimental procedure in the laboratory with the goal to see if vibrational data are able to distinguish among different levels of fixation between the two layers. We use a concrete slab as the thick layer and a MDF board as the thin layer, bonded by means of gypsum plaster. Different amounts of the surface covered by the gypsum plaster give different levels of fixation between the layers. For each configuration we produced vibration with a standard tapping machine and measured it with the aid of a vibrometer. Our results are positive; with a simple test vibrational data can distinguish whether two layers are fixed by 25% or less,by 50% or by 100% of their surface. With the laboratory results we have designed a non-destructive test to be carried on in-situ measurements so as to ascertain the level of fixation of two layers of a concrete slab. The test is based on the installations described in Annex A of ISO 16251-1, so that it does not require large investments or facilities. It is able to cope with different kind of data and is independent of the characteristics of the slab thanks to the statistics tools applied to the data. You can find the data in "Datos ensayos.zip" file.The second one is the application of the test to data measured in an actual building with the aforementioned problem in its garage floor. We measured vibration induced by a different source, a car passing by, and in several locations, both with loose and well fixed layers. The vibration was recorded by the same vibrometer as above. You can find the data in "Aravaca Class.zip" file.

Finally, you can find the data of the example of application described in the article in "Majadahonda.zip"