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Title: CHALCEDONITE-BASED REPAIR MORTARS APPLICABLE IN HISTORIC BUILDINGS – SALT CRYSTALLIZATION RESISTANCE
CHALCEDONITE-BASED REPAIR MORTARS APPLICABLE IN HISTORIC BUILDINGS – SALT CRYSTALLIZATION RESISTANCE

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Adam Pivak; Milena Pavlikova; Martina Zaleska; Zbysek Pavlik
10.5593/sgem2023/6.1/s26.34
10.5593/sgem2023/6.1
1314-2704
978-619-7603-61-3
English
23
6.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Green Buildings Technologies and Materials
Increasing demands on the thermal performance of the building envelope play a crucial role in the design of buildings in order to maintain a quality indoor climate with reduced energy consumption. In case of repair mortars development, the necessary thermal insulation improvement can be effectively achieved by using lightweight aggregates. However, the application of new materials to historical buildings might be problematic due to their incompatibility with materials originally used in the past. In this paper, two lime-based mortars have been prepared and studied in terms of their basic structural, thermal and mechanical properties with emphasis on the mechanical performance after salt crystallization. In terms of design, the first mortar mixture used silica sand as aggregate. In the second mixture, the sand was fully replaced by crushed chalcedonite. The samples were subjected to 10 wetting/drying cycles, immersed in NaCl solution and distilled water. The results confirmed that the application of porous chalcedonite aggregate caused significant increase in material porosity followed with the drop of thermal conductivity and compressive strength compared to the reference mortar with silica sand. On the other hand, residual compressive strength retained after the crystallization test exceeded the initial value before crystallization. Based on the results of the conducted experimental analyses it was concluded that the use of chalcedonite as aggregate in lime-based repair mortars might be beneficial due to the improved thermal insulation performance and resistance to salt crystallization.
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Authors greatly acknowledge the financial support received from the Czech Science Foundation under project No 21-06582S - Experimental and computational analysis of salt transport, accumulation, and crystallization in non-hydrophobized rendering mortars. The travel costs were covered by the Grant Agency of the Czech Technical University in Prague, under grant No SGS23/149/OHK1/3T/11 - Research and development of high performance building composites.
conference
https://doi.org/10.5593/sgem2023/6.1/s26.34
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 03 - 09 July, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
273-280
03 - 09 July, 2023
website
9246
lightweight repair mortars, chalcedonite, lime and natural hydraulic lime, salt crystallization resistance, compatibility and durability