Polishing concrete to achieve a high-gloss finish involves a multi-step process that requires specialized equipment and expertise. Here are the general steps involved in the process:
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Surface preparation: Before polishing, the concrete surface must be cleaned and any existing coatings or contaminants removed. This is typically done using a combination of chemical cleaners and mechanical abrasion, such as grinding or shot blasting.
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Initial grinding: Once the surface is clean, the first step in the polishing process is to grind the concrete with a coarse diamond abrasive. This is typically done using a planetary grinding machine that rotates multiple diamond grinding heads.
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Progressively finer grinding: After the initial grinding, the process is repeated with progressively finer diamond abrasives to achieve a smoother and more polished surface. Typically, three to four different grit levels are used in this process, with the final grit being very fine.
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Densifying and sealing: After the final grinding, the concrete surface is typically treated with a densifier, which is a chemical that helps fill in the pores of the concrete and increase its density. This helps improve the surface hardness and shine. The surface is then sealed with a penetrating sealer to protect it from stains and moisture.
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Final polishing: Once the surface is sealed, the final polishing step is done using a very fine diamond abrasive. This helps achieve the desired level of shine and reflectivity.
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Buffing: After the final polishing step, a high-speed buffer may be used to further enhance the surface shine and smoothness.
It is important to note that achieving a high-gloss finish on concrete requires a skilled professional with specialized equipment and expertise. DIY attempts can often result in uneven and unsatisfactory finishes. Additionally, regular maintenance is required to keep the surface looking its best.
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