Testing of tack coats (VSS1999/277)
Overview
Background & policy context:
A good inter layer adhesion is essential for a good performance of asphalt concrete roads. The empirical use of tack coats serves this goal. A parameter study should provide information for a more systematic use. Parameters like surface characteristics, cleanness, type of pavement, being of the practical importance, are investigated.
Objectives:
The aim of the research project is the evaluation of an appropriate testing scheme to asses tack coats (applicable type) and criteria for application (dosage, surface properties, and others). The project deals with new and used surfaces as well as surfaces after removal of upper layers. The project will proved a base for standardisation, thus contributing to a prolonged use of roads.
Methodology:
A basis for determining the quality of the layered composite is the shearing test according Leutner, where at selected systems but also the suitability of the strength tester is to be clarified. In some specimens, the water storage is carried out in order to discuss the influence of moisture on the coating adhesion. The long-term effects, that is e.g. the temporal variation of adhesion (setting process or building a adhesion effect under load) are considered in more detail in the system.
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