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.

本文介绍了从Rupnik线的军事掩体的渲染层获取的水泥基砂浆特性的结果。Rupnik防线被构想为保护意大利王国和南斯拉夫王国之间的拉帕洛边界的强化防御系统的一部分，始建于1920年。地堡建于1938年至1941年之间，各种构图的效果都被用作将掩体与环境融合在一起的迷彩层。岩石学检查结果以及样品的微观结构和化学分析结果证实，当地可用的碎白云石或石灰石砂用作砂浆中的骨料。作为粘结剂，使用纯硅酸盐水泥或水泥与磨碎的高炉矿渣的混合物。在特定砂浆中，对骨料和粘合剂类型的选择基于所生产的人造石材的颜色。具有白云石聚集体的所有样品均显示出碱聚集体反应，晶粒的去离子化和水泥粘结剂中的二次方解石形成以及Mg-Al，Mg-Si和Mg-Al-Si相形成。在波特兰水泥含量高的砂浆组合物中，也证实了钙矾石形成延迟。