Long-term durability assessment of PVC-P waterproofing
Plasticizer loss is the main phenomenon affecting the durability of PVC membranes. A device for accelerated ageing tests on PVC membranes has been developed. Mechanical tests are performed to study the time-dependent properties of membranes. Plasticizer loss with time has been modelled from plasticizer absorption tests data.
Long-term durability assessment of PVC-P waterproofing
Thus, a study on the durability of PVC-P geomembranes calls for an analysis of the long-term behaviour of plasticizer loss. 3. Tested materials In this study, two commercial geomembranes were tested. The first one, hereinafter called material A, was a coloured geomembrane, with a thickness of 2.0 mm with a signal layer.
Evaluating Plasticizer Loss In PVC Membranes - EPI
The rate of loss of plasticizer depends on plasticizer type, temperature, sheet thickness and exposure time. The actual mechanism behind this loss is evaporation of plasticizer from the surface of the membrane. Therefore, for highly plasticized PVC, as in this case, the rate of plasticizer loss is dependent on the surface area. Figure (1) shows
Methods for determination of plasticizer migration
In the case of PVC synthetic materials, plasticizers account for the vast majority proportion of the volatile substances. Until now the German DIN 75201 test method [ 11] formulated in 1992 has been the ‘gold standard’ to test the evaporation propensity of volatile compounds from vehicle interior materials.
Degradation of PVC Waterproofing Membrane containing Plasticizers
The actual lifetime of PVC waterproofing membrane is not only affected by the ageing of the materials, but also by the ageing of the joints. Thus, a significant phenomenon in the evaluation...
- Does plasticizer loss affect the durability of PVC membranes?
- Plasticizer loss is the main phenomenon affecting the durability of PVC membranes. A device for accelerated ageing tests on PVC membranes has been developed. Mechanical tests are performed to study the time-dependent properties of membranes. Plasticizer loss with time has been modelled from plasticizer absorption tests data.
- Does plasticizer loss occur in moist environments?
- Plasticizer loss is shown to be minimal in either moist or exposed environments. Membrane usefulness is not affected by the loss that does occur. Polyvinyl chloride (PVC) and PVC alloys have been used extensively for many years for containment. In fact, a number of sites decades old still have functional PVC liners.
- How does plasticizer loss affect geomembranes?
- A comparison of the aged geomembranes with the original commercial ones did not reveal a clear pattern of variation in the properties caused by plasticizer loss. This is because the ageing tests resulted in a loss of maximum 4% of plasticizer, which is not enough to clearly introduce changes in mechanical behaviour.
- Is plasticizer loss ratio a threshold for the end of a geomembrane?
- By analysing the changes in physical and mechanical properties of aged and tailor-made geomembranes, with different content levels of plasticizer, a value of plasticizer loss ratio that can be considered as a threshold for the end of the effectiveness of the geomembrane has been evaluated at 0.45.
- Are PVC-P geomembranes degraded in underground application conditions?
- To analyse the long-term degradation of PVC-P geomembranes in underground application conditions, in this study, a specifically designed accelerated ageing device has been used for the tests. Furthermore, plasticizer absorption tests have been used to estimate the dependence of plasticizer loss on temperature and plasticizer content.
- What is a plasticized PVC membrane?
- Typically, plasticized PVC membranes consist of a mixture of PVC and a plasticizer (1:2 %w), with 1–3 % of an ionophore conferring selectivity . The nature of plasticizers plays a crucial role in the performance of solid-state sensors, influencing their flexibility, structural integrity, and ion-binding capabilities.
