Overview: Concrete cancer may be experienced in older pools when concrete cracks, and water penetrates to the steel reinforcement deep inside the concrete. With emptying and refilling of swimming pools over time, and also thermal expansion and ground movement, minute cracks may occur in the concrete structure. The cracks then allow ingress of pool water down into the structure and in contact with the reinforcement. In turn the moisture causes the steel to rust. Rusting steel ultimately sheds its oxide skin forcing the rust layer to push against the
surrounding concrete. If left untreated pieces of concrete may ultimately be dislodged, further accelerating the corrosion process.
Treatment: The services of an experienced concrete specialist should be sought for pools exhibiting major concrete corrosion. Once the pool has been properly assessed, the correct repair process can be established.
In general this will involve:
- Removal of loose and damaged concrete.
- Clean concrete and water blast.
- Clean and remove all loose, rusted or damaged steel reinforcement
- Replace any steel reinforcement which is deteriorated beyond repair.
- Treat steel and exposed concrete surfaces with specialised priming products.
- Reinstate the void using high strength cementitious mix, or filled epoxy compound.
- Reinstate the surface quality commensurate with the finish of choice.
Epoxy vs Cementitious Repair? The decision will normally be based on a combination of the comparative costs of each process, and the speed by which the repair is required to be achieved. The difference in materials cost will be exaggerated for repairs of ‘large volume’.
- The high strength cementitious option will be lowest materials cost, however the time required for full cure, before which pool coatings can be applied, will be much extended.
- Epoxy repair techniques will be at higher materials cost, however the rapid cure will result in compatible linings/pool coatings able to be applied normally within 24 hours.
- A combination of cementitious and epoxy repair is often chosen by contractors.
Epoxy Repair using EPOXACOTE and LUXAPOOL products: Deep ‘cavity repairs’ may be carried out using EPOXACOTE HF as the concrete surface primer, and the same product extended using appropriate mineral extenders generally in accordance with ‘epoxy concrete repair techniques’. Refer to ‘EPOXACOTE HF
Thinner repairs and high quality re-surfacing are best achieved using LUXAPOOL SEF, premixed structural filler.
Refer to the technical data sheet for LUXAPOOL SEF.
In both cases allow 24 hours cure before surface grinding using 40-60 Grit ‘ZEC Disc’. Then brush or vacuum
away dust before application of LUXAPOOL EPOXY FINISH.
The technical information and/or application advice given in this publication represents the present state of our knowledge, and is believed to be reliable. Buyers and users of all Colormaker Industries products should conduct their own assessment to confirm the suitability of our product under their own conditions and intended requirements. Colormaker Industries offers no warranty of performance based on the above information either expressed or implied.