Comprehensive Analysis of Adherence in Stone Pavements

This study aims to establish a reliable method for analyzing adherence on stone road pavements. Field tests were conducted under dry and wet conditions on various natural stones, including porphyry, and basalt. The adherence was tested in different orientations (0°, 90°, 180°, and 270°), demonstrating a substantial invariability concerning the test direction for all materials tested. This allowed for the validation of the testing methodology prescribed in UNI EN 13036-4 for stone pavements. The adherence of stone pavements is influenced not only by the stone elements but also by the joints. The comparative analysis included tests on old and refurbished pavements, showing few significant differences in adherence characteristics. Furthermore, the properties of polyurethane resin joints were examined, including laboratory tests. These investigations revealed that an augmented resin presence on the surface of aggregates tends to reduce adherence. In conclusion, this study provides a detailed analysis of the adherence of stone pavements, taking into consideration various factors such as the type of stone, surface conditions (dry or wet), testing direction, and the contribution of joints. This information is crucial for the design and maintenance of stone road pavements.