Dampness problems in renovation plasters shortly after intervention: The case of a historicnbuilding in the Old Town of Prague

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Dampness problems in renovation plasters shortly after intervention: The case of a historicnbuilding in the Old Town of Prague

Popis výsledku v původním jazyce

This work is focused on the analysis of moisture and soluble salts affecting a historic building in the Old Town of Prague that was subject to a recent rehabilitation intervention. The intervention included the injection of a chemical damp-proofing substance at the ground level for blocking rising damp and the application of renovation mortar coats (in accordance with WTA-2-9-04/D) up to 2-3m of the walls' height and of a lime-based mortar in the area above. Striking widespread moisture stains appeared six months after the intervention, mostly on the lime-based mortar coats. To assess the effectiveness of the damp-proofing barrier applied in blocking rising damp, an assessment campaign was carried the renovation mortar coats, as well as of the underlying historic masonry materials along a vertical profile. The samples were analysed with the hygroscopic moisture content method combined with ion chromatography to investigate the nature and amount of salts present. Nitrates were generally found in high content at high levels in the walls pointing out a strategy implemented, i.e. with a water-repellent system applied at the lower level and an absorptive lime-based mortar coat applied at the upper level, can have contributed to draw more moisture (and salt) to a higher level. The overall results obtained indicate that rising damp was reduced to some extent, the moisture present in the superficial layers being mostly due to hygroscopic adsorption and the moisture registered in the deeper levels corresponding to previously accumulated damp before the intervention.

Název v anglickém jazyce

Dampness problems in renovation plasters shortly after intervention: The case of a historicnbuilding in the Old Town of Prague

Popis výsledku anglicky

This work is focused on the analysis of moisture and soluble salts affecting a historic building in the Old Town of Prague that was subject to a recent rehabilitation intervention. The intervention included the injection of a chemical damp-proofing substance at the ground level for blocking rising damp and the application of renovation mortar coats (in accordance with WTA-2-9-04/D) up to 2-3m of the walls' height and of a lime-based mortar in the area above. Striking widespread moisture stains appeared six months after the intervention, mostly on the lime-based mortar coats. To assess the effectiveness of the damp-proofing barrier applied in blocking rising damp, an assessment campaign was carried the renovation mortar coats, as well as of the underlying historic masonry materials along a vertical profile. The samples were analysed with the hygroscopic moisture content method combined with ion chromatography to investigate the nature and amount of salts present. Nitrates were generally found in high content at high levels in the walls pointing out a strategy implemented, i.e. with a water-repellent system applied at the lower level and an absorptive lime-based mortar coat applied at the upper level, can have contributed to draw more moisture (and salt) to a higher level. The overall results obtained indicate that rising damp was reduced to some extent, the moisture present in the superficial layers being mostly due to hygroscopic adsorption and the moisture registered in the deeper levels corresponding to previously accumulated damp before the intervention.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20103 - Architecture engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů