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Is BS EN 459-1:2015 fit for purpose in the context of conservation?


Reference:

Figueiredo, C., Ball, R. J. and Lawrence, M., 2016. Is BS EN 459-1:2015 fit for purpose in the context of conservation? The Journal of the Building Limes Forum, 23, pp. 46-52.

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    Abstract

    Natural hydraulic lime (NHL) binders consist mainly of portlandite, reactive silicates, and aluminates formed from the reaction of crushed limestone, containing clays or other impurities, during calcination. By their nature, these binders have a variable chemical and mineral composition, depending on the geographical location of the limestone extraction (initial composition) and the manufacturing process. The NHL classification, as specified in BS EN 459-1:2015, does not consistently give a representative indication of the properties of mortars made with particular NHL binders, because different limes in the same classification often exhibit very different properties and behaviour, thereby hindering the ease of user specification for mortars. A representative selection of binders was characterised using calorimetric analysis, X-ray diffraction, X-ray fluorescence, and particle size analysis. The varying proportions of reactive mineral phases between the limes were related to the kinetics of the hydraulic reaction of the NHL binders and their chemical and physical properties. A relationship has been established between the chemical and physical properties of the binders and the NHL characteristics. These results will be used to validate a model predicting the long-term behaviour of NHL mortars for conservation interventions on heritage and historic buildings.

    Details

    Item Type Articles
    CreatorsFigueiredo, C., Ball, R. J. and Lawrence, M.
    Uncontrolled Keywordsnatural hydraulic lime,conservation,lime mortar
    DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
    Research CentresCentre for Doctoral Training in Decarbonisation of the Built Envinronment (dCarb)
    BRE Centre in Innovative Construction Materials
    Centre for Sustainable Chemical Technologies
    Building Research Park
    RefereedYes
    StatusPublished
    ID Code52903

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