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Removing Excess Concrete
I have an exposed aggregate patio. The 4-foot-square slabs used to be divided by 2x4 redwood. The redwood finally rotted, so I replaced it with concrete. In some places the filler concrete spread over the exposed aggregate I didn't get it hosed off in time. I've tried wire-brushing with an electric drill, but it isn't doing the job. Any advice?
Andrew
Use tape and polyethylene sheeting to protect what exists. Use a 20 percent solution of muriatic acid to eradicate the spill. A wire brush will still be needed. Remember, muriatic acid is a diluted form of hydrochloric acid very dangerous stuff! Use eye protection, gloves and protective clothing to do the job. If concentrated muriatic acid dissolves concrete, imagine what it could do to your eyes and skin. When the job is done, sprinkle baking soda everywhere the acid was and rinse it into your garden with a water hose.
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