Effect of innovative bioproducts on the performance of bioformulated earthen plasters

Parracha, João Luís; Silva, R. Velez da; Silva, V.; Faria, Paulina

doi:10.1016/j.conbuildmat.2021.122261

Cited by 6 publications

(2 citation statements)

References 52 publications

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“…More recently, Parracha et al [20] used an innovative bio-product based on cellular extracts of Escherichia coli, cultured in lysogeny broth (LB) medium and supplemented with iron, in earth mortar formulation. Apart from a distinctive porous structure, a general decrease in mechanical properties was clearly observed, including in adhesion strength.…”

Section: Raw Earths Characterizationmentioning

confidence: 99%

“…Stabilizers such as lime, gypsum and cement were considered to improve the durability and mechanical properties of earth-based products [19]. However, in order to preserve the sustainability added value of raw earth-based construction, the choice of natural sources, possibly derived from wasted biomass, for extracting and/or producing bio-chemical stabilizers [20] should be pursued, in order to reduce overall environmental impact and to support future recyclability [15].…”

Section: Introductionmentioning

confidence: 99%

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Can TEMPO-Oxidized Cellulose Nanofibers Be Used as Additives in Bio-Based Building Materials? A Preliminary Study on Earth Plasters

et al. 2022

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Interest towards cellulose nanofibers obtained from virgin and waste sources has seen a significant growth, mainly thanks to the increasing sensitivity towards the concept of circular economy and the high levels of paper recycling achieved in recent years. Inspired by the guidelines of the green building industry, this study proposes the production and characterization of TEMPO-oxidized and homogenized cellulose nanofibers (TOHO CNF) from different sources and their use as additives for earth plasters on two different raw earth samples, characterized by geotechnical laboratory tests and mineralogical analysis: a high-plasticity clay (T2) and a medium-compressibility silt (ABS). Original sources, including those derived from waste (recycled cardboard and paper mill sludge), were characterized by determining chemical content (cellulose versus ashes and lignin) and fiber morphology. TOHO CNF derived from the different sources were compared in terms of nanofibers medium diameter, crystallinity degree, thermal decomposition and oxidation degree, that is the content of carboxylic groups per gram of sample. Then, a preliminary analysis of the influence of CNF on earth plasters is examined. Adhesion and capillary absorption tests highlighted the effect of such nanofibers on blends in function of two factors, namely the cellulose original source and the oxidation degree of the fibers. In particular, for both earth samples, T2 and ABS, a significant increase in adhesion strength was observed in the presence of some TOHO CNF additives. As far as capillary sorption tests, while an undesired increase in water adsorption was detected for T2 compared to the control, in the case of ABS, a significant reduction in water content was measured by adding TOHO CNF derived from recycled sources. These results pave the way for further in-depth investigation on the role of TOHO CNF as additives for earth plasters.

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Section: Raw Earths Characterizationmentioning

confidence: 99%