Petra Štukovnik (Author), Janez Peter Grom (Author), Marjan Marinšek (Author), Violeta Bokan-Bosiljkov (Author)

Abstract

This paper presents the results of cement-based mortars characterizations that were taken from rendered layers of military bunkers in the Rupnik Line. The Rupnik Line was conceived as a part of the fortified defence system protecting the Rapallo Border between the Kingdom of Italy and the Kingdom of Yugoslavia, established in 1920. The bunkers were built between 1938 and 1941, and the renders of various compositions were applied as a camouflage layer that merged the bunkers with the environment. Results of petrographic examination and microstructural and chemical analysis of the samples confirmed that locally available crushed dolomite or limestone sands were used as an aggregate in the mortars. As binders, pure Portland cement or a mixture of cement and ground granulated blast furnace slag were used. The selection of the aggregate and binder type in a particular mortar was based on the colour of the artificial stone produced. All samples with the dolomite aggregate show the presence of alkali-aggregate reactions, dedolomitization of the grains and secondary calcite formation in the cement binder, along with the Mg-Al, Mg-Si and Mg-Al-Si phase formations. In mortar compositions with a high Portland cement content, the presence of delayed ettringite formation was also confirmed.

Keywords

ACR reactions;camouflage renders;cement-based mortars;DEF;military bunkers;Rupnik Line;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
UDC: 691
COBISS: 9112417 Link will open in a new window
ISSN: 1558-3058
Views: 15
Downloads: 3
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Other data

Type (COBISS): Article
Pages: str. 1-12
Volume: ǂLetn. ǂXX
Issue: ǂšt. ǂX
Chronology: 2020
DOI: 10.1080/15583058.2020.1745320
ID: 19478696