Wastewater treatment plants - robust surface waterproofing
Waterproofing and repair of communcal wastewater treatment plants have very specific requirements on the materials and coatings used within the structure. Dirt and rain water emerging from the pipework into the plant is subjected to a variety of cleaning stages. Due to the variety of water qualities, the concrete surfaces are exposed to a variety of risks. Moisture penetration from the rear and bubble formation from osmostic pressure form only a part of the type of damage which appear. For this reason, with repair measures, the concrete sections in contact with the water must be permanently protected with specially selected primers and water repellent surface waterproofing compounds.
1 Levelling out voids
Make good small areas of crack damage and defects up to 40 mm with a trowel or lath. Apply ASOCRET-BIS-5/40 “wet in wet“ over an ASOCRET-KS/HB slurry bonding coat.
2 Evening out surfaces
Apply ASOCRET-BIS-1/6 on to the prepared substrate at the desired thickness – up to 6 mm in one application. Do not post-treat the surface with a wet brush or steel float. For a smooth transition it is possible to rub down the repaired surface with a sponge.
3 Waterproofing wall-floor junctions
At the transition between wall and floor as well as over connecting joints, brush or trowel apply AQUAFIN-2K/M-PLUS and bond the waterproof tape ASO-Joint-Tape-2000-S without voids or folds. Completely cover over with the surface membrane.
4 Transition to flange construction
At the flange construction, apply without pinholes, the special primer ASODUR-SG2-thix with a short nap paint roller. Once adequately hardened, further waterproofing measures can be carried out. Alternatively, the universal primer ASODUR-GBM can be used. Broadcast quartz sand into the wet primer until blinded.
5 Waterproofing all areas
Apply a minimum of two coats of AQUAFIN-2K/M-PLUS by spray, brush or trowel.