Performance Evaluation and Technical Requirement of Interlayer Stress Absorbing Composite Sticker (ISACS) for Mitigating Reflective Cracking in Asphalt Concrete Overlays

摘要

In order to establish the technical standard system of an interlayer stress absorbing composite sticker (ISACS), technical indexes including thickness, mass per unit area, tensile force, and corresponding elongation rate, performance after thermal aging test, and low-temperature flexibility were developed based on the study of relevant waterproofing membrane tests and the serviceability of ISACS. Six samples of ISACS made of three different kinds of materials, including glass fiber, polypropylene, and nonwoven geotextile were tested. The results showed that ISACS made of polypropylene has too high % elongation and very poor thermal aging capacity, ISACS made of nonwoven geotextile has too low a tensile strength, while ISACS made of glass fiber presented very good mechanical and thermal properties. Therefore, it was concluded that glass fiber is especially suitable for ISACS among these three kinds of materials. A technical requirement was also developed based on the above test results and reference to the standards of waterproofing membranes.