DIY

How to Mix Concrete

This guide on how to mix concrete places emphasis on finding the proper consistency for your mixture.

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by Flickr/Kevin Standlee

Guide to Concrete (Creative Publishing International, 2008) takes readers through some of the most popular home concrete and masonry projects. Endorsed by Quikrete, this book includes tips and expert advice that can help readers save hundreds or thousands of dollars in their DIY home projects. Excerpted from “Tools and Techniques,” this guide on how to mix concrete includes tips on using a power mixer.


person mixing concrete that has too much water with the words

person mixing concrete with not enough water in it with the words

A good mixture is crucial to any successful concrete project. Properly mixed concrete is damp enough to form in your hand when you squeeze, and dry enough to hold its shape. If the mixture is too dry, the aggregate will be difficult to work with, and will not smooth out easily to produce an even, finished appearance. A wet mixture will slide off the trowel and may cause cracking and other defects in the finished surface.

person mixing concrete with the word

Tools

  • Power mixer
  • Wheelbarrow or mortar box
  • Hoe
  • 5-gallon bucket
  • Safety glasses
  • Gloves
  • Particle mask 

Materials

  • Concrete mix
  • Water
  • Additives as desired

When mixing concrete on-site, purchase bags of dry premixed concrete and simply add water. Follow the instructions carefully and take note of exactly how much water you add so the concrete will be uniform from one batch to the next. For smaller projects, mix the concrete in a wheelbarrow or mortar box. For larger projects, rent or buy a power mixer. Be aware that most power mixers should not be filled more than half full.

When mixing concrete, the more water you add, the weaker the concrete will become. Mix the concrete only until all of the dry ingredients are moistened. Don’t overwork it; three to five minutes should be enough.

Instructions for Mixing Concrete

person pouring water in to a square container filled with concrete mix

1. Empty premixed concrete bags into a mortar box or wheelbarrow. Form a hollow in the mound of dry mix, and then pour water into the hollow. Start with 3/4 of the expected water amount per 80-pound bag.

person using a garden hoe to mix concrete powder and water together

2. Work with a hoe, continuing to add water until a good consistency is achieved. Clear out any dry pockets from the corners. Do not overwork the mix. Also, keep track of how much water you use in the first batch so you will have a reliable recipe for subsequent batches.

Using a Power Mixer

person pouring water in to a power concrete mixer

1. Fill a bucket with 3/4 gallons of water for each 80-pound bag of concrete you will use in the batch (for most power mixers, three bags is workable). Pour in half the water. Before you start power-mixing, review the operating instructions carefully.

person pouring concrete mix in to a power concrete mixer

2. Add all of the dry ingredients, then mix for 1 minute. Pour in water as needed until the proper consistency is achieved, and mix for 3 to 5 minutes. Pivot the mixing drum to empty the concrete into a wheelbarrow. Rinse out the drum immediately.

More Concrete Projects:

• DIY Concrete Landscaping and Garden Borders
• How to Make a Concrete Ramp
• Setting Posts in Concrete


book cover with a living room with a fireplace and black and yellow text

Reprinted with permission from Guide to Concrete: Masonry and Stucco Projects published by Creative Publishing International, 2008.