Influence of zeolite additive on the properties of plaster used for monumental salted walls

Authors: 
Klimek B., Barnat – Hunek D., Franus M.

For the protection of walls against salt dampness various plasters and coatings are proposed. The plasters which presented the ability to transport the salt solution from the substrate, assuring the materials durability, are preferable in respect to traditional plasters such as cementplaster. The purpose of this study is to investigate the impact of natural zeolite additives in the production lime plasters meant for salted walls. This paper addresses the results of investigation of lime plaster with zeolites. The article presents the laboratory examinations of the basic physical and mechanical parameters such as absorbability, capillary absorption, density, total porosity, compressive and flexural strength. Mechanisms of the mortar modification are discussed based on the characterization results. There were used the special additives to improve properties such as hydrophobizer, methylcellulose - water-retaining additive; vinylacetate and ethylene copolymer powder, the redispersive additive for improvement of adhesion. The experimental results showed that the mortars modified by natural zeolites thank to their porous structure are distinguished for good sorption properties and can accumulate in themselves a sufficient amount of salt. Lime plasters with natural zeolites proposed in this work are fully compatible with traditional building materials, meaning that they can be used in the restoration of architectural heritage where there are problems with salts.

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Klimek B. Influence of zeolite additive on the properties of plaster used for monumental salted walls / B. Klimek, D. Barnat – Hunek, M. Franus // Вісник Національного університету "Львівська політехніка". - 2014. - № 781. - С. 72-78.