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the substrate crumbles as a result of repeated impact by a hardened point, which causes the aggregate and cement paste to crack. This damages the surface considerably but allows the contractor to obtain a very rough profile with a CSP ranging from four to nine.
CHEMICAL TREATMENTS Chemical reaction may sound like an obsolete and environmentally unfriendly solution, but there are still applications in which this is necessary. If the job site cannot accommodate big machinery and the substrate is so compromised that hand-held devices are not powerful enough, chemical treatments might be the only solution. This method involves applying a solution of water and muriatic or citric acid to the concrete with a low-pressure sprayer or a plastic sprinkling can remove the superficial cement paste
The Hum-B Edge Grinder can cover more square footage in less time, with less effort while focusing on comfort. The ergonomic design allows the user to work standing upright. Getting them up off their knees reducing fatigue, backaches, and job site injuries.
and expose the fine aggregate. Acid treatments produce a very light profile similar to fine sandpaper. Since light profiling is suited to thin coatings, this method is ideal for microtoppings that are less than 10 mm thick. During the chemical treatment, toxic materials can be released, so it’s essential that operators wear personal protective equipment such as goggles. It’s also important to prevent contact between machinery and acid, since this could corrode any metallic components. Lastly, operators should be aware of local regulations on how to safely dispose of acid and contaminated water. Claude Besson is the country manager for France at surface preparation expert National Flooring Equipment.
Find this article at ForConstructionPros.com/ 21427377.
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Pulse-Bac Hum-B is the only edge grinder with the patented Dust Grabber™ shroud. This shroud allows the grinder to float across the surface like a puck on ice, eliminating suction lock and capturing 99% of airborne dust. DUST GRABBER SHROUD™ Patented Anti-Suction Lock Technology
The Hum-B Edge Grinder is ideal for concrete, terrazzo, stone, and removing paint, thin-set, adhesives, VCT, mastic and epoxy. www.ForConstructionPros.com/Concrete
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www.pulsebac.com/edge-grinders • 844-223-0584 DECEMBER 2021
CONCRETE CONTRACTOR 43
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