Solar radiation, rain, humidity and severe temperature levels. Cultural heritage is exposed to a selection of external aspects that weaken it in time. Amongst them, the most aggressive might well be microbial contamination, triggered by a sufficient community of fungis, algae, germs and tiny lichens that grow inside the pores of the products the structures are made from and they make these structures less resistant to other external representatives, accelerating the wear and tear procedure in time. .
When bring back historic monoliths, it is necessary to utilize difficult products that can hold up against these microbes. This job is intricate, considered that the products utilized in these sort of repairs should remain in accordance with the initial products, made from plaster, lime mortar and stones such as limestone or marble. Cement and concrete, products typically utilized in the most recent research study, are dismissed as they are incompatible with products such as lime mortar and might even intensify the issue. .
A research study group from the University Research Study Institute into Fine Chemistry and Nanochemistry at the University of Cordoba (the FQM 214 and FQM 175 groups) and Seville’s Institute of Natural Resources and Agrobiology of the Spanish National Research study Council (abbreviated to IRNAS-CSIC in Spanish) interacted to produce a biocide additive, as in one that eliminates microbes, that can be integrated into products utilized to restore historical monoliths and structures. .
“The products which contain these sort of chemical substances are commonly utilized in remediation however their efficiency typically lasts for a short quantity of time -about 2 years – given that the external representatives, in addition to degrading the product, wind up compromising its biocidal residential or commercial properties”, discusses Adrián Pastor, among the scientists on the research study which belongs to his doctoral research study for his thesis entitled “New practical products to decontaminate cultural heritage and metropolitan environments”. The research study has actually been carried out under the assistance of Dr. Luis Sánchez and Dr. Ivana Pavlovic and with the involvement of Dr. Manuel Cruz Yusta and Dr. Beatriz Gámiz (RNM 124). .
In this research study, the group evaluated hydraulic lime mortar to which they included carbendazim, a biocide substance usually commonly utilized in paint, as it has low water solubility and is for that reason more water resistant. In order to do so, they compared, on the one hand, the antimicrobial efficiency of a lime mortar to which carbendazim was straight included and on the other hand, a lime mortar whose clay consisted of an anchored biocidal substance. .
Both went through a number of microbiological tests in order to evaluate their capability to combat microbes and a seeping procedure, in which the soluble parts of a product are gotten rid of, imitating numerous rain cycles in a brief quantity of time. .(* )” In the very first microbiological test, we confirmed that the very first mortar, to which we straight included carbendazim, had a rather higher biocidal capability. Nevertheless, after the seeping procedures, we confirmed that the 2nd mortar, that had carbendazim anchored to the clay, revealed much better outcomes given that the biocide substance was launched more gradually and for that reason, its impact is more lasting”, discusses Adrián Pastor. .
This is an initial research study that needs more research study to get this product under research study on the marketplace, implying a bigger scale research study, along with studying the product’s particular physical residential or commercial properties in order to validate that it abides by guidelines concerning resilience, adhesion and other residential or commercial properties.
This research study belongs to the MATERPAT Task- “New practical products based upon encapsulation methods for the avoidance, preservation and remediation of cultural heritage” (RTC-2015-3916-6), moneyed by the Ministry of Economic and Organization Affairs. .
Adrián Pastor, Beatriz Gámiz, Manuel Cruz-Yusta, Luis Sánchez, Ivana Pavlovic. “Carbendazim-clay complexes for its prospective usage as antimicrobial ingredients in mortars”
Structure and Environment Doi:/ 10.1016/ j.buildenv.2020.107214
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