Today we’re going to be dabbing into the trade of mixing and applying cement.
I use the term “dab” because cement work, or concrete repair, isn’t something the average office softie ought to jump into full bore. Unless of course through a series of bad investments or sure bets gone lame at the track, you’ve indebted yourself beyond the point of recovery, and as an example to others you’ve been persuaded to jump into a bucket of soon to be cured concrete by fellows simply known to you as “Vito” and “the Razor”, let’s otherwise limit this first stab at concrete to a small repair.
Regardless of what type of concrete, be it wall, floor, steps, or walkway, is in need of repair or resurfacing, the strategy to preparing the area remains pretty well consistent.
First we scrub the area being repaired (using a steel, or otherwise stiff bristled brush), then sweep the surface clean with a fine, softer bristled broom. Next, rinse the area with the garden hose or spray bottle of water. Brush, sweep, rinse, that’s basically the prep work required for concrete repair.
Be sure to wear safety goggles and gloves at all times. Pre-mixed concrete powders usually have a Portland cement additive, which is corrosive. Not that these components will eat through your skin like battery acid, but with prolonged exposure, will certainly cause irritation. Should you get any powdered mix in your eyes, simply douse your face with water.
Tools for the job will include a bucket, trowels (pointing and pool), a quick mixer, and a drill. A pointing trowel is triangular in shape, and is handy for shaping cement to form a corner on a wall or step. A pool trowel is basically a rectangular trowel with rounded corners. Square cornered, or drywall type trowels, will gouge the finish as you spread the concrete mix over a wider surface, such as a platform or walkway. The pool trowel simply allows you to more easily float the trowel back and forth without creating too many lines.
A quick mixer is essentially a heavy duty whisk, or blender, that fits into the chuck of a regular drill. Don’t walk into this project without your quick mixer, thinking its function could be replaced by a paint stir stick and a little elbow grease, with the 15-20 buck investment better spent on a Tim’s run for coffee and muffins.
Depending on your choice of pre-mixed concretes, the working and setting time for many of these compounds is anywhere between 15 and 20 minutes. So, if after 5-6 minutes of stirring, an old hockey injury starts to creep back into play, requiring you to take a few moments of down time to wipe your brow and work the kink out of your shoulder, upon returning to the pail, you may find your first batch of mixed has turned into a secondary anchor for the boat.
The convenient aspect about the concrete repair products available today is that they come in a pre-mixed powder. This powder formula contains both the cement components, and the necessary bonding agents, which basically enables these new cement products to stick to older, existing surfaces. Don’t be intimidated by the number of various cement repair products you’ll find on the shelf of your local building supply store. The industry has become task specific, which was designed to simplify things, but on the other hand has created shelves full of pictured containers that can certainly leave the first time shopper a little bewildered. My suggestion is to let the salesperson know what type of repair project you’re attempting, then let them help you choose the most suitable mix for the job. Although there is certainly some crossover in that some pre-mixed cements could perform a number of tasks, you definitely wouldn’t want to choose a poly-plug compound (which dries in two minutes) and use it to build up a broken step corner that may take you 5-10 minutes to shape.