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

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.

[1] MosqueraM.J., BenitezD., PerryS.H., Pore structure in mortars applied on restoration. Effect on properties relevant to decay of granite buildings, Cem. Concr. Res. 32 (2002) 1883–1888.
[2] DegryseP., ElsenJ., WaelkensM., Study of ancient mortars from Salassos (Turkey) in view of their conservation, Cem. Concr. Res. 32 (2002) 1457–1563.
[3] WTA Merkblatt 2-9-04 Sanierputzsysteme.
[4] Maggot C., Rokiel M., Tynki renowacyjne w њwietle normy PN-EN 998-1:2004 oraz instrukcji WTA nr 2-9-04. Materiaіy
Budowolane 9(2009) 6-8.
[5] MoropoulouA., CakmakA.S., Biscontin G., Bakolas A., Zendri E., Advanced Byzantine cement based composites resisting earthquake stresses: the crushed brick/lime mortars of Justinian’s Hagia Sophia, Constr. Build. Mater. 16 (2002) 543– 552.
[6] LanasJ., Alvarez J.I.,Masonry repair lime-based mortars: Factors affecting the mechanical behavior. Cement and Concrete Research 33 (2003) 1867–1876.
[7] Sezemanas G., Sinica M., Zacharcenko P., Pivenj N., Mikulskis D., Kligys M., Influence of Zeolite Additive on the Properties of Plaster Used for External Walls from Autoclaved Aerated Concrete. Materials Science (Medziagotyra). 19, 2(2013)
[8] Perraki, T., Kakali, G., Kontoleon, F. The Effect of Natural Zeolites on the Early Hydration of Portland Cement Microporous and Mesoporous Materials 61 (2003) 205-212.
[9] Sahmaran, M., Ozkan, N., Keskin, S., Uzal, B., Yaman, L, Erdem, T. Evaluation of Natural Zeolite as a Viscositymodifying Agent for Cement-based Grotus Cement and Concrete Research 38 (7) (2008) 930-937.
[10] PN-EN 1015-11:2001P:Methods oftest for mortar formasonry - Part 11:Determination offlexural strengthand compressive strengthof hardened mortar.
[11] PN-EN 1015- 10: 2001P:Methods of test formortar for masonry Part 10:Determination ofdrydensityof hardened mortar.
[12] PN-EN 1936:2010: Natural stone test methods-Determination of density and bulk density and of total
and open porosity.
[13] PN-EN 1015-18:Methods of test formortar for masonry Part 18:Determination of water absorption coefficient due to capillary hardened mortar.
[14] PN-88/B-06250: Beton zwykіy.
[15] PNEN12370: 2001: Methods of research of natural stone. Determination of resistance to crystallization of salts.

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.