Ready-mix concrete supplier a.b.e. Construction Chemicals’ durajoint flexband joint bandage system offers a solution for waterproofing expansion and construction joints, including critical joint areas with high or frequent movement, says the company’s concrete repair and general construction products manager Ivor Boddington.
The a.b.e. sealing mechanism includes a durajoint flexband, durajoint adhesive, as well as a durajoint high-density polyethylene (HDPE) strip, durajoint flexband solvent wipe, bond breaking tape and the appropriate sealant for various substrates.
The durajoint flexband system is particularly suitable for the sealing of joints in potable water concrete reservoirs and other water-retaining structures, Boddington says.
“The system is the ideal solution for repairing failed joints, repairing and sealing structural cracks, and for the sealing of joints subject to chemical attack, as it is resistant to a range of chemicals.”
In addition to waterproofing concrete reservoirs, the system can be used on a variety of substrates including damp (not wet) substrates. It can also be used in contact with potable water. The bandage is supplied in 20 m rolls and several widths.
The system includes durajoint flexband adhesive, a special epoxy adhesive for bonding the durajoint flexband thermoplastic elastomer membranes. The adhesive is a two-component, solvent-free epoxy resin bedding mortar/adhesive with low slump characteristics.
The adhesive can be applied in sections of up to 20 mm thickness horizontally, and 10 mm vertically in a single application without the need for formwork. Greater thickness can be achieved by the application of more layers. The adhesive can be hand mixed on a flat clean surface.
Some of the advantages of the adhesive include early high strength, which reduces downtime, high peel strengths to the membrane, and resistance to chemicals. Priming is usually not required unless the concrete is very porous.
Food and Drug Aministration-compliant, durajoint flexband adhesive is supplied in 2 ℓ kits. The solvent wipe, used to clean the surfaces to be sealed, is produced in 5 ℓ containers; the system’s HDPE strips are 3 mm thick, 50 mm or 75 mm wide, produced in 3 m lengths. The strips are used to centrally straddle expansion joints when support below the flexband membrane is required.
a.b.e. is part of the Chryson Southern Group.