Long-term durability assessment of PVC-P waterproofing geomembranes
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 these geomembranes, especially in relation to the long expected lifespan of new tunnels (i.e. 100–150 years).
PVC Geomembranes for Environmental Containment - Layfield
PVC Specifications Product Description Flexible Polyvinyl Chloride films (usually called PVC) have been used for geomembrane applications for over 60 years. PVC films are blends of rigid PVC (such as in PVC pipe) with softening agents called plasticizers.
Long-term durability assessment of PVC-P waterproofing geomembranes
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...
What Is PVC Geomembrane? | EPI - The Liner Company
Polyvinyl butyral (PVB) resin, the adhesive interlayer used in the manufacture of safety glass. Polyvinyl fluoride (PVF) resin used as an outdoor weather-resistant coating. Polyvinylidene chloride (PVDC) has good resistance to moisture vapor and oxygen transmission and is widely used in food packaging film. Polyvinyl chloride (PVC) resin is the
PVC geomembrane plasticizer technology
PVC geomembrane plasticizer technology Technology of Plasticizers EXTRACT FROM: "THE TECHNOLOGY OF PLASTICIZERS" BY J. KERN SEARS AND JOSEPH R. DARBY CHAPTER ON "PERMANENCE OF PLASTICIZED PVC"from the plasticizers occupying more of the surface area at higher concentrations.
- What is PVC geomembrane?
- PVC geomembrane is a highly flexible thermoplastic waterproofing geomembrane manufactured from a mixture of vinyl compounds, plasticizers, and stabilizers. They are your answer if you need to cover your subgrade fast.
- 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.
- 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.
- 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.
