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Preservation and restoration of historical plaster

Using selected historical buildings as a basis, determine
quantitative/chemical parameters and limit values to more
accurately define historical properties so historical
and current production methods/techniques can be compared.

1. State-of-the-art and project scope: As a rule, the repair and maintenance of historical buildings (HBs) are required because they are to be re-utilized in total or in part. However, the exterior structural elements of such buildings, in particular the plaster facades which have been exposed to weathering and pollution impact, have suffered a decrease in durability during long time exposure. When dealing with repair, renovation and conservation of such facades, modern standard methods of plastering apply only to a limited extent. It is therefore essential to develop guideline information and test modifications of recent recipes on mortar preparation and application for the above purpose. In particular, the scope of the project is the development of suitable methods which allow for the evaluation whether: - the outdoor plaster of a given HB can be preserved; if so, which repair and conservation measures must be undertaken; - the outdoor plaster of a given HB must be removed; if so, which properties other than essential appearance must be defined for the new mortar system. Such methods must be as little destructive as possible, easy to handle and relatively cheap, as frequently they will have to be applied by craftsmen at the worksite. 2. Definition Phase: - Selection of HBs in AUSTRIA (in accordance with the AUSTRIAN FEDERAL MONUMENTS PERSERVATION OFFICE) and in partner countries; the HBs selected (in total about 5 to 7) will be mainly of the classicist and historicist architectural styles in keeping with the foregoing items. - Selection of suitable mechnical and physical examination methods, preferentially applicable in-situ. - Definition of sample parameters to be measured by conventional means. 3. Implementation phase: - Analyses of major parameters of historic plaster samples from the selected HBs, both defining their original composition including aspects of mixture and application technology, and their state and degree of alteration (chemical and petrographical properties, physico-mechanical properties like permeability, water absorption, various mechanical strength parameters, frost resistance, etc.). Wherever possible, relevant standard and norms will be applied. - Application of selected in-situ methods and calibration by the conventional ones. - Definition of the properties of suitable repair and substitution mortars according to the results from HP analyses. Thus, not more than five types of mortar with respect to mixture on to raw and primary materials will be developed. Development of corresponding process technologies for mortar production. - Tests of the above materials according to the relevant standards, with particular attention being paid to the limit values worked out in the earlier stages. 4. Exploitation Phase: - Commercial production of mortar systems by manufacturers. - Eventual commercial production of in-situ test devices.
Acronym: 
EUROPLASTER
Project ID: 
1 382
Start date: 
01-06-1995
Project Duration: 
30months
Project costs: 
370 000.00€
Technological Area: 
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.