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COATINGSPRO SURFACEPREP 2015 15 Concrete and Steel are often used for repairing common slab problems, such as uneven surfaces, curled joints, and trip hazards. EDCO manufactures both grinders and scarifers, which not only create a surface profle but also remove any existing coating material from the concrete substrate. "Te Direct Drive Grinder that can resurface hundreds of square feet per hour, as well as remove hard coatings, and the Heav y-Duty Floor Grinder/Polisher is capable of removing industrial strength coverings like waterproofng membrane, polymer, thick epoxy, and urethane," said Stanczyk of EDCO. Another Option: Abrasive Blasting Abrasive blasting is another option that coatings contractors have when it comes to creating a surface profle. "Airblast equipment and abrasive can give a consistent and uniform surface profle, resulting in overall performance of the coating applied. It also contributes to the quality and consistency of the coating system," said A l Slater of A xxiom Manufacturing Inc., the manufac- turer of Schmidt air blasting products. According to Slater, Schmidt products can be used on almost any substrate, including concrete, with variation of the blast pressure, abrasive fow rates, and hardness of the abrasive used. Tony A nni of Sponge-Jet, a company that manufactures recyclable encapsulated abrasive media, agrees that abrasive blasting is a viable option for preparing concrete surfaces. " T he core technolog y of Sponge Media compos- ite abrasives bonds high-quality abrasives w ith a sy nthetic sponge-like material. On concrete, Sponge Media can achieve concrete surface profile (CSP) one through eight, as authored by the International Concrete Repair Institute (ICR I). Sponge media products produce less surface fractur- ing of concrete than other ty pes of abrasives, resulting in stronger adhesive strength between the coating and the concrete," explained A nni. Wet abrasive blasting is another t y pe of abrasive blast- ing technique that can be used on concrete. In this process, water is injected w ith abrasive med ia and then projected onto the substrate. Accord ing to Her nan A zocar and Patti Roman of C lemco, water-injected, air-powered abrasive blasting is gent ler on the concrete sur face whi le sti l l creating a sur face prof i le and remov ing oi ls and other contaminants. " T he process a lso prov ides containment of airbor ne dust. C lemco is cur rent ly work ing on a repack aged version of a water-in- jected abrasive blasting system w ith a blast machine, water pump, and tank convenient ly located on one sk id w ith fork lif t slots for easy por tabi lit y," said Roman. Steeling Applicators for Protective Coating Success "W hen unprotected steel is exposed to oxygen and hydrogen in the air, an electrochemical reaction takes place in the steel that leads to its destruction by a process known as corrosion. Te application of a coating is the most common method — and arguably Some equipment can be used to remove existing material from the substrate as well as create a surface profile. Shown here is a scarifier, which can do just that, this one is from EDCO. Whether for steel or concrete, choosing the right system for your crew is important. There are many parts to consider, including the hoses, nozzles, and units. Shown here is an option from Sponge-Jet.

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