Long-term durability assessment of PVC-P waterproofing
Currently, the most commonly used technology for tunnel waterproofing is plasticized polyvinyl chloride (PVC-P) geomembranes. However, not much is known about the long-term durability of...
PVC Geomembranes for Environmental Containment | Layfield
PVC is one of the most versatile plastics available with formulations that can provide oil resistance, UV stability, low-temperature resistance, and other specific properties. PVC is also the easiest material to repair with repair kits available. Standard formulations of PVC geomembrane materials are blended for longevity and low cost.
GSP-142: PLASTICIZER RETENTION IN PVC GEOMEMBRANES - Webflow
2001) for slo pe stability . Most PVC geomembranes contain plasticizers as an additive to increase the flexibility, softness, workability , pliability, and distensibility of the material . Plasticizers are typically a high boiling, organic liquid that reduce s the glass
PVC geomembrane plasticizer technology
When a material in contact with the PVC surface is efficient enough as an absorbent to remove plasticizer as rapidly as it reaches the surface, the rate of diffusion will control plasticizer loss. In such cases, loss will theoretically equal the loss by evaporation into a vacuum at that temperature.
PVC fabricated geomembrane polymeric plasticizers EPI - The
Polymeric plasticizer A-3,300 provides a respectable balance of migration resistance properties, while G-3,700 and G-12,000 provide excellent resistance to migration. Glutarate polymerics are especially known for their non-migration characteristics (3). Volatility Resistance
- 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 are PVC-P waterproofing geomembranes?
- Formualtion PVC-P waterproofing geomembranes are composed of 30–40% PVC resin and other additives ( Koerner, 2012), mainly plasticizers. Plasticizers are a group of more than 1000 different polymers used to change the behaviour of PVC from a rigid material to a semi-rigid or flexible one.
- How much plasticizer is in a geomembrane?
- Typically, the plasticizer content in geomembranes ranges from 25 to 35% in weight. Fillers (e.g. CaCO 3) added to the PVC resin may also account for 20–30% of the weight of the geomembrane. Fillers are used to reduce the price, but also to enhance the abrasion resistance and flame-retarding properties.
- Does plasticizer loss affect the behaviour of PVC-P geomembranes?
- Further, to better analyse the influence of plasticizer loss on the behaviour of geomembranes, eight different formulations of PVC-P geomembranes are studied and tested for their mechanical properties. Long-term extrapolations of the ageing of PVC-P geomembranes are estimated on the basis of the plasticizer absorption tests.
- How long does a PVC-P geomembrane last?
- Apart from the lack of a reliable long-term degradation model for PVC-P geomembranes, currently, there is no defined threshold to determine the end-of-life of a PVC-P geomembrane. Benneton (1994) proposed a plasticizer loss ratio of 0.5; however, the basis of this value is not provided.
- Does plasticizer loss affect geomembranes in underground applications?
- In the hypothesis that plasticizer loss is the only degradation process relevant to geomembranes in underground applications, the loss of plasticizer can be evaluated through the loss of weight of the specimens. Accordingly, all the specimens were cleaned, dried in the desiccator for 72 h and weighed before testing.
