Removing set concrete from a mixer requires a combination of mechanical action and, potentially, chemical assistance. Here's how to do it:
Steps to Remove Set Concrete
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Initial Cleaning: Start by removing any loose debris or chunks of concrete from the mixer. You can use a trowel, hammer, and chisel for this step. Safety glasses are essential.
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Apply Concrete Dissolver/Cleaner: Pour a commercial concrete dissolver or cleaner into the mixer drum. Follow the manufacturer's instructions carefully, as these products can be corrosive. Examples include solutions based on muriatic acid or biodegradable alternatives.
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Turn On the Mixer (with Cleaner Inside): With proper PPE (gloves, eye protection), turn the cement mixer on. Let it rotate for a significant period (usually 30-60 minutes, but follow the cleaner's directions). The rotation, combined with the cleaner, helps loosen the hardened concrete residue. Ensure the area is well-ventilated.
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Scrape and Chip Away: After the mixer has run, turn it off. Use a chisel, hammer, and/or a sturdy scraper to carefully chip away any remaining concrete that the cleaner hasn't fully dissolved. Be patient and persistent. Multiple applications of cleaner may be necessary for thick build-up.
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Pressure Washing (Optional): A pressure washer can be extremely effective in removing loosened concrete. After scraping, use a pressure washer to blast away any remaining debris. Use appropriate safety gear (eye protection, gloves, and closed-toe shoes).
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Rinse Thoroughly: Once all visible concrete is removed, thoroughly rinse the mixer drum with water to remove any remaining cleaner residue.
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Prevention: To prevent future build-up, clean the mixer immediately after each use. This involves rinsing the drum with water while it's rotating. Consider using a concrete release agent inside the mixer before mixing concrete.
Safety Precautions
- Wear Safety Gear: Always wear safety glasses, gloves, and a dust mask when working with concrete and cleaning solutions.
- Ventilation: Work in a well-ventilated area, especially when using chemical cleaners.
- Read Instructions: Carefully read and follow the manufacturer's instructions for any concrete dissolver or cleaner you use.
- Proper Disposal: Dispose of concrete debris and cleaning solution waste properly, according to local regulations.
By following these steps and taking appropriate safety precautions, you can effectively remove set concrete from your mixer and keep it in good working condition.
