Study of nitrate contaminated samples from a historic building with the hygroscopic moisture content method: Contribution of laboratory data to interpret results practical significance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F18%3A00480895" target="_blank" >RIV/68378297:_____/18:00480895 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.culher.2017.09.013" target="_blank" >https://doi.org/10.1016/j.culher.2017.09.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.culher.2017.09.013" target="_blank" >10.1016/j.culher.2017.09.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study of nitrate contaminated samples from a historic building with the hygroscopic moisture content method: Contribution of laboratory data to interpret results practical significance

Popis výsledku v původním jazyce

The assessment of moisture and soluble salt affecting the masonry materials of a historic building located in Prague triggered the present experimental research focused on the use of the hygroscopic moisture content method for the evaluation of nitrate salts in building materials. The building under study had been recently subjected to a rehabilitation intervention that encompassed the injection of a damp-proofing chemical at the ground level and the application of renovationmortar coats. The applied renovation plasters and renders showed striking moist stains within 6 months after their application. To unveil the reason behind the moist-related problems observed, several samples of repair plasters and renders were collected from affected areas. The HMC method combined with ion chromatography was used to investigate amount of soluble salts. Nitrates were generally found in a high content and located at high levels in the walls. The IC results and the generalised surface wetting observed on-site led us to infer that nitrocalcite was one of the main salts present. The results obtained instigated a laboratory study with the HMC method to assess the hygroscopic behaviour of single nitrate salts and salt mixtures. The selection of single salts and the design of the salt mixtures was based on the IC data of the selected materials’ samples aiming at replicating their hygroscopic behaviour. The results of the case study indicated that the rehabilitation strategy implemented reduced the rising damp phenomena, but that the choice of the type of mortar coats may have contributed to drawing existing moisture to higher levels in the walls. The evaluation of the hygroscopic behaviour of samples with the HMC method at a range of RH provided a better understanding of the on-site behaviour of the salt-contaminated materials in the building. The results of the laboratory study showed that the salt mixtures prepared simulated well the hygroscopic behaviour of the building samples.

Název v anglickém jazyce

Study of nitrate contaminated samples from a historic building with the hygroscopic moisture content method: Contribution of laboratory data to interpret results practical significance

Popis výsledku anglicky

The assessment of moisture and soluble salt affecting the masonry materials of a historic building located in Prague triggered the present experimental research focused on the use of the hygroscopic moisture content method for the evaluation of nitrate salts in building materials. The building under study had been recently subjected to a rehabilitation intervention that encompassed the injection of a damp-proofing chemical at the ground level and the application of renovationmortar coats. The applied renovation plasters and renders showed striking moist stains within 6 months after their application. To unveil the reason behind the moist-related problems observed, several samples of repair plasters and renders were collected from affected areas. The HMC method combined with ion chromatography was used to investigate amount of soluble salts. Nitrates were generally found in a high content and located at high levels in the walls. The IC results and the generalised surface wetting observed on-site led us to infer that nitrocalcite was one of the main salts present. The results obtained instigated a laboratory study with the HMC method to assess the hygroscopic behaviour of single nitrate salts and salt mixtures. The selection of single salts and the design of the salt mixtures was based on the IC data of the selected materials’ samples aiming at replicating their hygroscopic behaviour. The results of the case study indicated that the rehabilitation strategy implemented reduced the rising damp phenomena, but that the choice of the type of mortar coats may have contributed to drawing existing moisture to higher levels in the walls. The evaluation of the hygroscopic behaviour of samples with the HMC method at a range of RH provided a better understanding of the on-site behaviour of the salt-contaminated materials in the building. The results of the laboratory study showed that the salt mixtures prepared simulated well the hygroscopic behaviour of the building samples.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/DG16P02H012" target="_blank" >DG16P02H012: Vápenné materiály pro restaurování a konzervování autentických prvků historických staveb</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of Cultural Heritage

ISSN

1296-2074

e-ISSN

—

Svazek periodika

30

Číslo periodika v rámci svazku

March-April

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

13

Strana od-do

57-69

Kód UT WoS článku

000427580300008

EID výsledku v databázi Scopus

2-s2.0-85035041238