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Recommendations of RILEM TC 139-DBS: Durability of Building Sealants Durability test method - Determination of changes in adhesion, cohesion and appearance of elastic weatherproofing sealants for high movement façade joints after exposure to artificial weathering



Title: Recommendations of RILEM TC 139-DBS: Durability of Building Sealants
Durability test method - Determination of changes in adhesion, cohesion and appearance of elastic weatherproofing sealants for high movement façade joints after exposure to artificial weathering
Author(s): RILEM TC 139-DBS
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 34
Issue: 244
Issue date: 2001-12-01
Publication year: 2001
Pages: 579 - 588
Total Pages: 10
Language: English


Abstract: Weatherproofing joint seals in light-weight building façades (curtain-wall cladding)are exposed to frequent cyclic movements.
This joint movement imposes cyclic mechanical strain on the seal,which,depending on the exposure conditions and the construction design,can vary substantially in rate and amplitude.
The joint seals are subjected to movement immediately after installation and are therefore exposed to continuous cyclic move ment during their curing period.
During cure,the rheological characteristics of cured-in-place sealants gradually change from being viscous,semi-fluid materials to nonflowable elastomers and most sealants,in particular onecomponent products,can take a considerable time (over four weeks)to cure.
Continuous building movement coupled with slow sealant curing time can lead to permanent and detrimental changes in sealant bead geometry and performance characteristics.
During their entire service life,joint seals are exposed to cyclic mechanical strain and environmental degradation factors.
Cyclic joint movement,sunlight, temperature variations (heat,cold)and moisture (water) are considered to be the primary environmental and service degradation factors leading to sealed joint failure.
This technical recommendation provides a framework for assessing the effects of cyclic movement and weathering in a laboratory-based procedure.
While default values for the test parameters are provided in the test method,test conditions can be adapted by the experimenter to better reproduce local climatic or service conditions.


Online publication: 2001-10-27
Classification: RILEM Technical Committees
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/13782


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