
Concrete Countertop Fills Role of Night Light
This blog post highlights the innovative use of Ambient Glow Technology (AGT) in a concrete bathroom countertop project. Nick Coello, operations manager of Concrete Interiors in Waukesha, Wis., successfully integrated AGT, a glow-in-the-dark concrete aggregate, along with turquoise and amber glass into a seamless precast countertop. The project involved a 6-foot by 26-inch countertop with an integral sink and backsplash, crafted from 2 cubic feet of concrete.
The fabrication process began with Coello using a melamine mold and a polyurethane sink mold to form the countertop. Wooden dowels, sprayed with form release, were incorporated for faucet knockouts. To achieve both aesthetic and functional elements, 8-millimeter AGT and decorative glass were meticulously glued to the surface of the mold using 3M spray adhesive. Steel reinforcement was added before the concrete pour, ensuring structural integrity.
For the concrete mix, Coello utilized Cheng Pro Formula Mix in Platinum, dry-mixing the color with the concrete before adding water in a 12-cubic-foot Imer electric mixer. During the pour, a vibrating table was employed to ensure even distribution and consolidation of the concrete, with a pencil vibrator used for precision along the edges. The bottom of the countertop and sink were finished with a hand trowel. A controlled curing environment was maintained for three days using a plastic tent and a warm mist humidifier.
Post-curing, the countertop underwent a multi-stage polishing process. Coello used a 5-inch wet polisher and diamond pads, starting from a 50-grit and progressing to a 3,000-grit, to expose the aggregate and AGT, achieving a smooth and lustrous finish. The integral sink required hand polishing pads due to its intricate shape. Following polishing, the surface was sealed with Cheng Pro Formula Sealer, burnishing pads were used to eliminate air bubbles, and a final wax and polish completed the process.
Coello expressed satisfaction with the outcome, noting that the AGT, which appears pale white in daylight and glows blue in the dark, functioned effectively as a night light. The AGT's ability to charge in 10 minutes and emit light for up to 10 hours provided both a decorative and practical feature for the homeowners. This project marked Coello's first time working with AGT in a countertop application, and the material handled well during grinding and polishing, similar to other decorative aggregates. The article emphasizes the potential for creativity and functionality that specialized aggregates like AGT bring to concrete countertop design.
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