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• Vogiatzis, D
• Kantiranis, N
• Filippidis, A
• Tzamos, E
• Sikalidis, C
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• Kantiranis, N
• Filippidis, A
• Tzamos, E
• Sikalidis, C
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• Kantiranis, N
• Filippidis, A
• Tzamos, E
• Sikalidis, C

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Geosciences 2012, 2(4), 298-307; doi:10.3390/geosciences2040298

Article

Hellenic Natural Zeolite as a Replacement of Sand in Mortar: Mineralogy Monitoring and Evaluation of Its Influence on Mechanical Properties

Dimitrios Vogiatzis ¹ , Nikolaos Kantiranis ^1,* , Anestis Filippidis ¹ , Evaggelos Tzamos ¹  and Costas Sikalidis ²

¹ Department of Mineralogy–Petrology–Economic Geology, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece ² Department of Chemical Engineering, Aristotle University of Thessaloniki, P.O. Box 1683, Thessaloniki 54006, Greece

* Author to whom correspondence should be addressed.

Received: 9 October 2012; in revised form: 14 November 2012 / Accepted: 16 November 2012 / Published: 22 November 2012

(This article belongs to the Special Issue Geoscience of the Built Environment)

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Abstract: HEU-type zeolite-rich volcaniclastic tuff (Hellenic natural zeolite) is used as a raw material for the production of lighter mortars. The addition of natural zeolite in mortar mixtures of sand and Portland cement leads to a decrease of up to 18.35% unit weight. The increase of the natural zeolite proportions increases the porosity and water absorption of the mortar and, at the same time, decreases the uniaxial compressive strength. These variations in the mortar’s mechanical properties are due to the addition of natural zeolite, which causes incomplete hydration of C₂S (2CaO.SiO₂) and retardation of the mortar’s hardening.

Keywords: lightweight mortars; incomplete hydration; retardation of hardening; natural zeolite

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