MICROSTRUCTURAL STUDIES AND DURABILITY OF GEOCOMPOSITES FOR THERMAL PROTECTION COATINGS OF LANDFILLS

Abstract

The article presents the results of experimental studies to assess the durability of a geocomposite consisting of low-pressure polyethylene (HDPE) and geotextile used to shelter winter blocks of the TMO dumps of the Kounrad mine. Samples that have been in use for various periods (from one month to three years) have been studied. Microstructural studies of HDPE and geotextile surfaces were performed using a JSM-6390LV scanning electron microscope (JEOL, 2007). It has been established that microcracks and perforations form on the HDPE surface during operation, indicating gradual deformation of the material, while the geotextile structure remains intact. The results make it possible to assess the nature of the degradation of the polymer matrix of the geocomposite and confirm its high resistance to external influences under long-term operation conditions. It was also revealed that even in the presence of microdefects in the polymer part, the coating retains its functionality and continues to effectively perform thermal protection tasks.