Grinding discs are not all the same, especially the good ones. They are what many consider “the secret ingredient” in construction tools that produce a range of ever-increasing finishes on concrete and masonry surfaces. They lead the way in design and mold “final appearances,” but many don’t know our jobs are often accomplished with them. They take an appearance that’s anything but “final” and move us in the direction of professional results. Not surprisingly, the variety of concrete ‘truing’ products on the market can be overwhelming.
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Understanding the Challenges of Concrete and Masonry Grinding
Concrete and masonry are very unforgiving materials. They test the mettle of contractors and their equipment, in large part because they create work surroundings that are so dusty and dirty. The conditions they generate can make any job in construction inhospitable. But, there is hope for contractors. This hope lies in the fact that the technology and capabilities of grinding discs have kept pace with the manufacturing advancements that have made concrete and masonry more of a force to reckon with.
Key Factors to Consider When Choosing a Grinding Disc
Coarse Substance:
- The toughest known material is diamond, which is why it is the hardest working ingredient in the world of abrasive construction products. When you think of grinding concrete, diamonds are most likely the first thing that comes to mind. Why? Because diamond-tipped tools are the tried-and-true ones to rely on when you need to grind something. And hey, if they can grind through that most dense of materials, then it makes sense that they’re a good choice for getting down and abrasive with your next concrete or masonry project.
- Also called carborundum, silicon carbide is a chameleon when it comes to materials science. It can be formed into a plethora of structures and has surfaces that enable very different and useful properties—both for application in research and for commercial goods. For example, silicon carbide heated to dizzying temperatures can reduce space telescope part production times by 99 percent. Silica, a major ingredient in sand, metal oxides, and carbon, which is plentiful enough to be cheap, can be combined in various ways to create different crystalline structures to form silicon carbide.
Size of grit:
- Rough-textured grains (16-36) are perfect for rapid and efficient elimination of materials, rendering of distorted or out of proportion surfaces, and of course, elimination of the rebellious hard-head coatings that stand in the way of your projects.
- Grits that have a medium level of coarseness, somewhere between 40 and 80, are very handy for a variety of tasks. You can use them for grinding, especially for smoothing out rough spots; for instance, on masonry work, you might use a medium-grit tool to get rid of the remnants of a formwork. These are also most likely the kinds of tools one would use to prepare a surface for a coating.
Pro Tips for Selecting the Right Grinding Disc
- When you’re not certain which disc is the correct choice for your project, it’s always smart to consult with an expert before making a purchase. That being said, here are a few general tips to get you started.
- When working with a grinding disc, it’s usually best to begin with a coarser grit for more rapid material removal. You can accomplish this, for instance, with either a 16- or 20-grit disc. Then move on to 40-grit and, finally, 80- or 100-grit for your finished work.
- Another way to work a disc is to use it while it’s wet. For this, you’ll want a special rig that can supply water to the disc at a rate of maybe a couple of gallons per minute. This is not so much to keep the workpiece cool but rather to reduce the amount of dust that’s produced.
Conclusion:
Picking out the right grinding disc for the job of working with concrete and masonry is something that you must do with care if you want to make certain you achieve good outcomes. You must consider a number of things, and what follows here are some basic guidelines to help you make your selection. If you follow them, you can’t go far wrong. For the most part, the decision is in your hands, but with the information provided, the decision should be an easier one to make. Grind on.