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Elsevier, Construction and Building Materials, (102), p. 125-132

DOI: 10.1016/j.conbuildmat.2015.10.169

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Absorbent materials in waterproofing barriers, analysis of the role of diatomaceous earth

Journal article published in 2016 by A. Tavares, A. Costa, F. Rocha ORCID, A. Velosa
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Calcined diatomite mortars retain and transport water above waterproofing barriers. The volumetric dosage changed from 1:3 to 1:2 reduces capillary coefficient levels. Non-calcined diatomite mortar showed better results in comparison with NHL3.5. Non-calcined diatomite shows better results in opposition to calcined diatomite. a b s t r a c t This paper presents recent development in experimental assessment of the capillarity involving the effect of diatomaceous earth in water proofing barriers (1940s and 1950s solutions). The introduction of diato-mite in hydraulic lime mortars as a waterproofing barrier was firstly reported in licensed architectural plans after 1945 in the central region of Portugal. This was the period of Modernist buildings, a recent heritage to preserve and widely disseminated worldwide, recognised as the 20th century heritage. A methodology was presented to test these types of solutions considering the calcined and not calcined dia-tomite. Experiments reveal that two aspects need to take into account: (1) the presence of not calcined diatomite tends to have a better behaviour in relation to calcined diatomite; (2) the type of diatomite— calcined or not calcined—has influence in the capacity of retaining water in the barrier, as well as the variation of volumetric dosage of the components.