ROAD WATERPROOFING, CAPE TOWN, SOUTH AFRICA

The Municipality of Cape Town wanted a tough waterproofing solution to stop consistent water ingression into the mall and taxi rank below the Adderley and Strand streets in Cape Town. Delta`s proposal to the City Engineers was to strip the Asphalt Premix and expose the substrate below, prior to making any definite recommendation. Once the asphalt was removed; it was discovered the substrate was of old design precast concrete blocks (600 mm x 500 mm) that were in excellent condition. The specification submitted was to diamond grind the blocks, creating a sound surface profile of 60-80 microns. Intermediate trials had been conducted: Applying the bituminous tack coat that is used before laying 200 mm hot asphalt premix, onto 3 mm DELTAShield HP 400.

After the specification was confirmed, the application took place in following steps:

1. Removal of all existing asphalt premixes

2. Substrate preparation (Repair of any damages, cracks, imperfections on the concrete blocks)

3. Diamond grind of the substrates to create a sound surface profile of 60-80 microns

4. Priming with solvent free DELTAPrime 2K SF Primer

5. Application of Pure Polyurea DELTAShield HP 400 spray with a minimum thickness of 3mm