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FASTENERS & SEALING


Grady Knight, manager at Belzona


Technology Washington, explains: “When we first approached engineering houses, they were familiar with methods of cold bonding but had seen or heard of many failures. We highlighted that this was due to two fundamental reasons. Firstly, some of the previously used shop-bought adhesives were prone to shrinkage. Belzona’s systems are 100% solids, so there will be no shrinkage due to solvent evaporation. Secondly – and perhaps most importantly – insufficient surface preparation could be blamed for these failures. Tis could be easily rectified via supervised application with a Belzona technical consultant on site.”


CASE STUDY Over a five-year period, the distributor has completed more than 110 applications of varying size and scale. Of these, one of the largest occurred in October 2013 on a 220ft water tower. Te system chosen to carry out the application was Belzona 1111 (Super Metal), a corrosion-resistant composite material capable of exceptional levels of adhesion. Once the number of plates per antenna was determined, the bonding areas of the tank and plates were sufficiently prepared in line with the specification. Particular care was taken on uneven areas, especially where the mounts needed to bond over weld seams; therefore, the existing paint was removed without compromising the integrity of the weld itself. Belzona 1111 was then thoroughly


mixed and brush-applied onto both surfaces, before being pressed firmly together to ensure optimum bond strength. Since installation, the material has performed well in service, much to the satisfaction of the tank asset owner and the network provider.


Expansion is eased by using tanks in the wastewater industry


and providing a significant advantage over drilling holes in the substrate.


Optimal surface preparation achieved prior to bonding


Belzona 4111 (Magma-Quartz) used to embed steel beam into the roof


46 www.engineerlive.com


NOT ONLY TANKS It is not only water tanks that have been used to increase network coverage across the state. In addition, concrete structures and municipal buildings have become agreed locations on which cell antennae can be established. Concrete walls and parking structures have featured frequently, as well as one example on a Seattle high-rise building. Following the removal of roofing insulation, steel beams were embedded using one of Belzona’s concrete rebuild solutions. Tis then allowed the mounts to be cold bonded with a Belzona adhesive, avoiding complications with pre-stressed concrete


TREND SIGNALS A PROMISING FUTURE Failure of the mounts can cost the mobile phone company tens of thousands of dollars in fallen equipment, plus the potential physical danger to anyone in the area below. Belzona’s multipurpose adhesives mitigate these risks, making them ideal solutions because of their cold-applied nature and excellent adhesive properties. As well as the bonding of mobile phone antennae mounts and brackets, often this application extends to cable mounts and trays on to the side of the structures due to success experienced with previous applications. Indications suggest that over the next


two years, the application of phone antennae (and therefore their mounts) will triple in size across the USA. With cold bonding and its accompanying application procedures now featuring prominently in the installation schematics, this marks promising growth for the partnership of polymeric adhesives and the mobile phone network.


For more information visit www.belzona.com


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