Experimental Study on the Influence Factors of Durability of Composite Geomembrane

The durability of composite geomembrane materials may decrease under the long-term influence of natural environment such as light and temperature. In order to study the influence of different factors on the durability of composite geomembrane, the durability of composite geomembrane with different aging time was tested by artificial accelerated aging test. The experimental results show that the longitudinal tensile strength of composite geomembrane material decreases slightly with the increase of time. Additionally, the longitudinal elongation of composite geomembrane materials is proved to be located in a reasonable range, and there is no obvious upward or downward trend. The permeability coefficient of composite geomembrane material varies with the aging time, however, the test result remains in the same order of magnitude. The longitudinal tensile strength of composite geomembrane in dry state is larger than that in immersed state. The strength of the welded joint of geomembrane is larger than that of the bonded joint. The yield strength and breaking strength of geomembrane materials increase slightly with time, and there exists no significant changes in terms of the yield elongation and breaking elongation.