In Slovenia the pathological chemical reactions in concrete occur as alkali-silica (ASR) and sulphate reaction (SR). The mechanism of the ASR depends upon the crystallinity of the aggregate, and the threat of the phenomena exists in the use of silicate gravel and of certain lightweight aggregates. The studies of the SR have shown thaumasite (in railway tunnels due to sulphur pollution), and etringite (in road tunnels, built in rock containing sulphur) reaction. The studies are important for the understanding of the reaction mechanisms, and for the selection of prevention measures.
COBISS.SI-ID: 986727
It was established that corrosion processes of steel in concrete can be dynamic and localized. In such cases the applicability of conventional electrochemical methods is limited, because they provide only general data over a defined time interval. Three different methods were developed (electrochemical noise, measurements of partial corrosion currents using coupled electrodes, electrical resistance probes), upgrading the traditional methods in such a way as to allow the detection of rapid changes in the corrosion processes and their localization.
COBISS.SI-ID: 958055
The articles listed above deal with the problem of measurements and characterization of complex types of corrosion, which are typical of corrosion-resistant alloys. It was proved that the method of stress-corrosion cracking (SCC) is crucial for crack detection and the monitoring of these processes. By using a combination of several methods (electrochemical noise, acoustic emission), in transgranular SCC was possible to detect individual cracking events, whereas in intergranular SCC was possible to monitor the cumulative development of cracking (cumulation of defects due to corrosion).
COBISS.SI-ID: 957799
The study focused on the possibility of use of coupling agents based on organicaly modified alkosysilanes as potential modifiers for cementitious materials. The role of the coupling agent was to make covalent bonding among different inorganic phases of inorganic matrix (cement, aggregate) and covalent bridging between inorganic matrix and organic (polymer) phase of the cementitious system. The study showed that by adding different acryloxysilanes to the cement mortars a significantly improvement in mechanical properties and durability of mortars was achieved.
COBISS.SI-ID: 1028967
It was proved that the pigments used in historical paintings can be reliably identified by using a simple technique based on a combination of optical and scanning electron microscopy. The relevance of the proposed technique was verified during the study of colour layers from the Abbey of Stična, and the Manor of Novo Celje. The mechanisms of ageing of different binders were also determined. It was found that some binders are more stable, especially when combined with different pigments. The results of this work are crucial when deciding which binder to use in specific case of restoration.
COBISS.SI-ID: 1306215