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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/223945
Additius naturals amb funcions hidrofugants en morters de calç aèria: un estudi comparatiu de l'arròs, el nopal i l'oli de llinosa.
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[cat] Aquest treball estudia l’eficàcia hidrofugant de tres additius naturals (pols de midó d’arròs, pols de
nopal i oli de llinosa) incorporats a morters de calç aèria, amb l’objectiu de millorar-ne el
comportament davant l’aigua en intervencions de conservació-restauració de patrimoni arquitectònic
exposat a l’exterior. Mitjançant assaigs experimentals, s’han avaluat l’angle de contacte, l’absorció
capil·lar, la porositat oberta i la duresa superficial. Els resultats indiquen que l’oli de llinosa i el nopal
augmenten la hidrofobicitat, mentre que el midó d’arròs no presenta canvis significatius. L’oli de
llinosa, però, pot comprometre la transpirabilitat del morter. Els additius no redueixen la porositat
oberta de manera significativa, excepte en el cas de l’oli, tot i que el seu valor pot estar infraestimat.
Pel que fa a la duresa superficial, només el nopal mostra un augment rellevant. Aquest estudi destaca
el potencial d’aquests materials naturals com a alternatives sostenibles, tot i que caldrien assaigs de
durabilitat i una revisió metodològica per validar els resultats a llarg termini.
[eng] This study investigates the water-repellent effectiveness of three natural additives (rice starch powder, opuntia powder, and linseed oil) incorporated into non-hydraulic lime mortars, aiming to improve their performance against moisture in outdoor conservation-restoration interventions on architectural heritage. Through experimental tests, contact angle, capillary water absorption, open porosity, and surface hardness were evaluated. Results show that linseed oil and nopal increase hydrophobicity, while rice starch does not produce significant changes. However, linseed oil may compromise the mortar’s breathability. The additives do not significantly reduce open porosity, except for linseed oil, whose value may be underestimated due to its high hydrophobicity. Regarding surface hardness, only the nopal additive shows a notable increase. This research highlights the potential of these natural materials as sustainable alternatives, though further durability tests and methodological adjustments are required to confirm long-term effectiveness.
[eng] This study investigates the water-repellent effectiveness of three natural additives (rice starch powder, opuntia powder, and linseed oil) incorporated into non-hydraulic lime mortars, aiming to improve their performance against moisture in outdoor conservation-restoration interventions on architectural heritage. Through experimental tests, contact angle, capillary water absorption, open porosity, and surface hardness were evaluated. Results show that linseed oil and nopal increase hydrophobicity, while rice starch does not produce significant changes. However, linseed oil may compromise the mortar’s breathability. The additives do not significantly reduce open porosity, except for linseed oil, whose value may be underestimated due to its high hydrophobicity. Regarding surface hardness, only the nopal additive shows a notable increase. This research highlights the potential of these natural materials as sustainable alternatives, though further durability tests and methodological adjustments are required to confirm long-term effectiveness.
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Treballs Finals de Grau de Conservació-Restauració de Béns Culturals. Facultat de Belles Arts. Universitat de Barcelona, Curs: 2024-2025, Tutor: Otero Hermo, Jorge
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PÉREZ RUIZ, Andrea. Additius naturals amb funcions hidrofugants en morters de calç aèria: un estudi comparatiu de l'arròs, el nopal i l'oli de llinosa. [consulted: 17 of June of 2026]. Available at: https://hdl.handle.net/2445/223945