MasterSeal 345
Spray applied waterproofing membrane for tunnel concrete composite shell linings
Description:
MasterSeal 345 is an EVA polymer based sprayable membrane for the waterproofing of underground concrete structures. It is spray applied in a sandwich structure between two sprayed concrete / cast concrete layers, creating a double bonded composite shell lining. It is flexible and has very high bond strength properties on both sides of the membrane. It is an effective alternative to conventional waterproofing sheet membranes.
As a double bonded system, this provides excellent
water tightness, preventing the development of
water migration on both sides of the membrane.
As with all spray applied membranes, it is not
possible to seal against water ingress through the
substrate. In such cases, a drainage system or local
water management using drainage pipes should be
used in combination with MasterSeal 345. However,
it can be applied to damp substrate (as long as there
is no running water).
Fields of application:
Suitable for all types of tunnel designs
Particularly well suited for underground structures with complex profiles and geometry such as stations, escape and access tunnels, utility caverns, cross passages and tunnel intersections
Enables tunnel design with composite shell lining to reduce excavation cross section and lining thickness, and is especially suited to tunnel rehabilitations
Features and benefits:
Fast curing
Easy to use, only addition of water needed
Application by spraying with simple equipment
Elasticity 80% to 140% depending on temperature
No toxic components
No classification needed for transport