An Investigation of the Effects of Thermo-Oxidative Aging and the Freeze–Thaw Cycle on the Performance of Polyester-Based, Self-Adhesive Asphalt Waterproofing Membranes

Abstract

Polyester-based, self-adhesive asphalt waterproofing membranes have garnered significant attention due to their extensive use in building-waterproofing projects, with their resistance to aging in complex environments being particularly crucial. This study evaluates the performance changes of these membranes under thermo-oxidative aging and freeze–thaw cycling conditions. The thermo-oxidative aging process was simulated using a thin-film oven and combined with freeze–thaw cycle tests to assess membrane performance at various aging stages. Changes in functional groups were analyzed via Fourier Transform Infrared Spectroscopy (FTIR), and tests for low-temperature flexibility, tensile properties, and peel strength were conducted. The results demonstrated that aging significantly reduced the membrane’s low-temperature flexibility and peel strength, accompanied by oxidative reactions and a loss of lightweight components. This study provides essential data on the aging behavior of the membrane and offers a theoretical foundation for its long-term application in practical engineering.