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Special reactive bituminous acrylate sealants are used for sealing surfaces in building structures. They are suitable for undergrade building structures as well as for freely accessible building structures. Structural elements with ground contact, however, must be laid bare before bitumen coatings for surface sealing can be applied. Bituminous coatings withstand high water loads and are especially suited for use in monument conservation.
Polymer modified bituminous thick coatings (PMB) are used for (classic) vertical sealants in building structures. Reinforcement fabric is used as reinforcing material in the area of joints and for bridging cracks.
Structural analysis before use:
This provides information on:
Substrates must be free of loose and separative substances. Slightly absorptive substrates should be roughened using a suitable method. Open joints, concave moldings and rounded edges in corners must be closed with mortar or floated to obtain a closed, smooth surface. Old, firmly adhering bitumen coatings can be reworked after cleaning.
A scratch coat must be applied to concrete substrates before applying the bituminous thick coating for actually sealing the surface. The coating material itself can be used as scratch coat.
Bituminous Acrylate Dispersion
It is recommended to apply a thin priming coat of WEBAC® 5611 without cement before mixing WEBAC® 5611 with the cement and applying it to the substrate. The bitumen coating can be applied by roller or wide paint brush; spraying is also possible. Reinforcing fabric can be used to reinforce corners and to bridge expansion joints.