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Author(s):	Schubert, Peter
Title:
Abstract:	Außenputz muss in wichtigen Eigenschaften auf den Putzgrund, vor allem bei wärmedämmendem Leichtziegel-Mauerwerk, angepasst sein, damit schädliche Putzrisse bis in den Putzgrund vermieden werden. Der Nachweis ausreichender Eigenschaftsanpassung kann mit Hilfe der Druckfestigkeit des Putzes auf dem Putzgrund erfolgen. Diese soll etwa 5 N/mm2 nicht überschreiten. Die Druckfestigkeit wird mit den Verfahren II oder III nach DIN 18555-9, vorzugsweise mit dem Verfahren III an Putzscheiben von am Bauwerk entnommenen Bohrkernen ermittelt. Ein Bezug dieser Druckfestigkeitswerte zu denen an Prismen nach DIN EN 1015-11 (“Standard”-Normprüfung, Normdruckfestigkeit) ist möglich. Dadurch lässt sich auch näherungsweise der (obere) Grenzwert der Normdruckfestigkeit bestimmen, bei dem davon ausgegangen werden kann, dass die Putzdruckfestigkeit am Bauwerk den empfohlenen Wert von etwa 5 N/mm2 einhält. Testing the compressive strength of external rendering on masonry. The important properties of external renderings have to be adapted to the respective rendering base, especially in case of masonry made of high thermal insolating light clay units, to avoid unintentional crack formation in the rendering extending into the rendering base. A criterion for the adaptation between rendering and base is the compressive strength of the rendering, which should not exceed 5 N/mm2. The compressive strength of the rendering can be tested according to DIN 18555-9, test method II or III. Preferably, it should be determined with test method III by use of small plates of the rendering taken from drilled masonry samples. A relation of these compressive strength values to values tested on prisms (standard test method according to DIN EN 1015-11) does exist. Thus, the upper limit value of the compressive strength tested on prisms can approximately be determined, with which it can be assumed that the compressive strength of the rendering on the masonry wall does not exceed the recommended value of 5 N/mm2.
Source:	Mauerwerk 15 (2011), No. 3
Page/s:	140-144
Language of Publication:	German

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