Publicomos

Notice (permalien)

Réf.

43292

Type

article

Titre

Efficacy of iron-based bioproducts as surface biotreatment for earth-based plastering mortars

Langues

English

Auteurs

Parracha, João Luís / Pereira, Alice S. / Almeida, Nídia / Faria, Paulina / Silva, Ricardo Velez da

Maison d'édition

Elsevier

Date

2019

Addenda

Article n° 117803.

Titre de la revue

Journal of Cleaner Production

Vol. & n°

v. 237

ISSN

0959-6526

Mots-clés

earth architecture / non-destructive testing / iron / bacteria / biochemical analysis / protective coatings / compatibility / biotechnology / ecology

Résumé en anglais

The use of bacteria for the enhancement of construction materials has been a focus of study in the pastfew years. Microbial cells have been applied to consolidate the surface of different materials. Earthen plasters are eco-efficient building products that can be applied on new buildings but also used to protect cultural heritage structures, with several advantages. They are based on abundant, affordable and easy to obtain materials, but are vulnerable to water. New eco-efficient bioproducts were developed based on E. coli cultures supplemented with iron, that can be obtained as an industrial by-product. They wereapplied in laboratory on an earth plaster surface and the biotreatment efficacy was assessed. The main objective was to improve the durability of the plastering mortar when exposed to water. An optimized E. coli-iron based surface biotreatment strongly increased the plaster resistance to water with the application of only 0.0625 mL/cm2 of E. coli-Fe leading to a significant increase of water absorption time in comparison with similar plasters where the same amount of water was applied. Moreover, all biotreatments produced an increase of resistance to water absorption creating a slight waterproofing effect, ensuring compatibility. Their loss of efficacy with time guarantees reversibility of the intervention. The results show the interest to perform an in-depth study on the microstructure of biotreated earthmortars to understand the biotreatment effect.

Ressource intégrale

DOI

https://doi.org/10.1016/j.jclepro.2019.117803