Short-Term Effect of Biopolymer-Based Coatings on Surface Hardness and Color of Limestone Exposed to Tropical Outdoor Conditions

Camacho-Chab, Juan Carlos and Camacho-Chab, Pedro Alberto and Pereañez-Sacarías, Juan Enrique and Montero-Muñoz, Jorge Luis and Almeyda-Cen, Augusto Ignacio and Dzul López, Luis Alonso and Reyes-Estebanez, María Manuela and Ortega-Morales, Benjamín Otto UNSPECIFIED, UNSPECIFIED, UNSPECIFIED, UNSPECIFIED, UNSPECIFIED, luis.dzul@uneatlantico.es, UNSPECIFIED, UNSPECIFIED (2024) Short-Term Effect of Biopolymer-Based Coatings on Surface Hardness and Color of Limestone Exposed to Tropical Outdoor Conditions. Coatings, 14 (2). p. 154. ISSN 2079-6412

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Abstract

It has previously been shown that epilithic bacterial biopolymers used as coatings influenced the physical properties (surface hardness and color change) at different levels and decreased the surface disaggregation of experimental limestone when evaluated at the laboratory level. A short-term study (30 days) was conducted to evaluate the performance under natural conditions of limestone blocks exposed to tropical conditions of a selected bacterial biopolymer (TM1B-488, after the producing bacterium) and a previously unreported Mayan plant biopolymer known as “Escobilla”, Sida rhombifolia (Malvaceae) used in conservation procedures. Surface hardness (Leeb units) and color (L*a*b* coordinates) were measured and statistically tested for two types of limestone blocks (sound and deteriorated limestone). Both biopolymers increased surface hardness, decreased surface disaggregation, and did not alter color. Escobilla polymer is a carbohydrate-rich biopolymer characterized by tangential filtration, global chemical composition, and monosaccharide composition of hydrolyzed polymer. These results indicate that biopolymers of a heteropolysaccharide nature are constituted by some anionic charge residues that could contribute to surface stabilization and consolidation, but compatibility with traditional building materials (mortars) and longer time of exposure (a year) are necessary to fully assess their applicability in the restoration of architectural heritage.

Item Type:	Article
Uncontrolled Keywords:	polysaccharide-based polymers; bioconsolidation; limestone; surface hardness; non-destructive test; stone bioconservation; confidence interval; bootstrapp; short-term assessment
Subjects:	Subjects > Engineering
Divisions:	Ibero-american International University > Research > Articles and books
Depositing User:	Sr Bibliotecario
Date Deposited:	08 Jul 2026 06:33
Last Modified:	08 Jul 2026 06:33
URI:	https://repositorio.funiber.org/id/eprint/28602

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