Test method for water saturation of asphalt pavements (VSS1998/085)
Overview
Background & policy context:
In early January 1998, numerous Swiss standards were revised by the "Association Schweizerische Stassenfachleute" VSS. Among them, the Swiss standard SN 640 is 452c "hot mix foundation layers, request execution" [1]. The revision of this standard, the test of sensitivity to water has been added, where the strength is to be reviewed by hot mix foundation layers after immersion in water. An important point of this test is to determine the saturation or partial saturation level. The information contained in this standard are largely based on the requirements of ASTM D 4867-92, "Standard Test Method for Effect of Moisture on Asphalt Concrete Paving Mixtures", which are drafted in such imprecise that by modern standards in terms of quality assurance and reproducible practice is not guaranteed close to implementation. The aim of this project is the development of a methodology for determining and calculating the degree of saturation of Marshall´s bodies with different void content based on the ASTM and finishing work of a Swiss test specification for the implementation of the saturation (partial saturation).
Objectives:
The objective of the project is to develop a test method to evaluate the saturation level of Marshall specimen with various void contents. The basis for this test method is the relevant ASTM standards.
Methodology:
Following steps will be done during the project:
1. All specimens that were prepared for the same tests should be saturated with the same pressure.
2. The aided by the standard saturation level by 55 to 80% can be achieved with 300mbar pressure.
3. Saturation levels all specimens should comply with the defined in ASTM saturation limits between (55 and 80Vol-%).
4. The time between conditioning and testing must be the same for all specimens.
5. In cases where the test specimens have a difference of the void content of more than 1%, the degree of saturation on the basis of the volume of the test specimen has to be calculated.
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