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Effect of innovative bioproducts on the performance of bioformulated earthen plasters
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Parracha, J.L., Pereira, A.S., Velez da Silva, R., Silva, V. and Faria, P. (2021) Effect of innovative bioproducts on the performance of bioformulated earthen plasters. Construction and Building Materials, 277 . p. 122261. ISSN 09500618 [Article]
Full text not available from this repository.Abstract (in English)
Biotechnologies mainly based on precipitation of chemical compounds produced by microbial metabolism can be used as biotreatment or bioformulation of construction materials. Bioformulation of cement-based materials has been a common research practice, though its application to earthen-based building materials is still limited. Although earth mortars are vulnerable to water damage, they are nowadays often used as plasters on new constructions but also for the retrofitting of existent buildings. Their reversibility and compatibility with old substrates make them also interesting for conservation interventions, namely when applied to protect archaeological structures as sacrificial renders. In this study, an innovative bioproduct based on cellular extracts of Escherichia coli, cultured in Lysogeny broth (LB) medium and supplemented with iron, was developed and used as a component for earth mortars’ bioformulation. The Escherichia coli strain used is classified as not hazardous. An additional earth mortar bioformulated with LB medium as mixing liquid was also tested to assess the influence of the culture medium. The iron supplement was chosen to infer about iron oxide biomineral formation, a less toxic mineral than calcite, since no toxic by-products are produced, and iron oxide minerals have a longer lifetime when compared with calcite crystals. Bioformulated mortars presented a very distinct porous structure, with a significant decrease on mechanical properties. Nevertheless, they also showed a decrease on thermal conductivity, a slight consolidative effect, and a significant decrease on vulnerability towards water. Apart from the possible use as mortar air entraining agents, the obtained results show the interest on further studies on the use of nontoxic iron-based bioproducts for earthen mortars optimization.
| Item Type: | Article |
|---|---|
| Authors: | Authors Email Parracha, J.L. UNSPECIFIED Pereira, A.S. UNSPECIFIED Velez da Silva, R. UNSPECIFIED Silva, V. UNSPECIFIED Faria, P. paulina.faria@fct.unl.pt |
| Languages: | English |
| Keywords: | Air entraining agent; Biotechnology; Clayish earth mortar; Physical performance; Porous structure; Water absorption; Vulnerability to water; plaster; earthen plaster |
| Subjects: | C.ARCHITECTURE > 04. Building materials F.SCIENTIFIC TECHNIQUES AND METHODOLOGIES OF CONSERVATION > 06. Analysis of materials F.SCIENTIFIC TECHNIQUES AND METHODOLOGIES OF CONSERVATION > 11. Artificial ageing tests |
| Volume: | 277 |
| ISSN: | 09500618 |
| Depositing User: | Prof. Paulina Faria |
| Date Deposited: | 27 Mar 2022 21:44 |
| Last Modified: | 27 Mar 2022 21:44 |
| URI: | https://openarchive.icomos.org/id/eprint/2601 |
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