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All concrete requires coarse and fine aggregates for proper consistency and strength. In fact, these aggregates are a main composition of concrete. In the application of countertops, the aggregates are of great importance. Obviously, the aggregates must allow the concrete to set up as it should. However, aggregates can have roles in the aesthetics of the concrete countertop, as well. For example, the type of fine aggregates chosen (i.e. sand) can drastically change the color of the finished product. Also, if the countertop is polished, the process can grind into the concrete, exposing aggregates. In this case, aggregate sizes and colors are just as important as any concrete coloring to the final look of the top. Also, if exposing the aggregate, consider using aggregates other than gravel, including broken glass, marble or granite chips, nuts and bolts, etc.
For the surface, there are many different finishes that you can choose, including flat, polished, stamped or impressed, troweled, textured, and more. This finish can have a enormous impact on the final look of the concrete countertop.
If you can imagine an edge finish, it is available with concrete countertops. The only limitation is the makers ability to create the mold or form. Of course, square corners are an easy and common edge shape for concrete countertops. Also, you can use a router, like those used on granite or marble countertops, to create edge styles including bull nose, rounded corners, triple egg, ogee, and more. There are also a variety of Styrofoam and rubber edge molds that can mimic wood trim, jagged rock edge, and numerous more. Or, if you are feeling adventurous, you can create your own molds. Just remember: you only get one try. If you mess up, the only fix is a new concrete countertop.
If you are really going for a streamline look with your countertop, consider actually molding your sink into the concrete countertop. This will mean you have one fluid piece that accounts for the counters and the sink with no seams. There are even more sink shapes available with concrete than there are with other materials. Again, if you can dream it and build the mold, you can make it with concrete.
There are a variety of techniques used to achieve a certain color in a concrete countertop. One of the most basic methods is adding a pigment into the concrete mix before the countertop is poured. These colors are often called integral colors or integrated colors. Integral colors add color throughout the countertop, making the center of the countertop the same color as the surface. This is especially important if any grinding or polishing is to occur after the pour. Post-pour colors will grind off, exposing the original color of the concrete. Some post-pour concrete coloring techniques include stained concrete countertops, tinted concrete countertops, and dyed concrete countertops. Each coloring method will result in a uniquely different result. Generally, the same rules apply for concrete countertop pre- and post-pour coloring techniques as they do for regular concrete slabs. Make sure to check rules and tips for each of these techniques before attempting. For example, you will likely want to wait until the concrete countertop is completely cured before applying any stain, which may take up to 60 days for interior applications.