Picture of DIY CONCRETE:: How-To-Mix Concrete
This Instructable will cover three ways to mix regular concrete, one way to mix glass-fiber-reinforced-concrete (GFRC), and instructions on performing a Slump Test to check the consistency of the concrete mix.

The method you use will depend mostly on the size of your project, but also on what tools and equipment are available. For a larger project, like a concrete countertop, you'll have to rent a mixer. For something smaller, the concrete can be mixed in a wheelbarrow. For even smaller projects, under 30 lbs., mixing by hand in a big bucket is perfectly fine.

  • Sacked Concrete Mix
  • Pigment, Water Reducer, CHENG Pro-Formula or other all-in-one Admixture (optional)
  • Concrete Mixer (there is a wide range of mixers out there)
  • Buckets
  • Water
  • Particle Mask
  • Thick Rubber Gloves
  • Trowel
In General:
  • Calculate the amount of concrete you'll need using a little bit of math or online volume calculators (don't subtract for knockouts).
  • Always mix up more concrete than you think you'll need.
  • Don't use sacked concrete that has been exposed to moisture and is hard like a rock.
  • Always throw out any big clumps in the mix that won't break up when squeezed in your hand.
  • If the mix is getting too stiff, agitating it with vibration will help it become fluid again.
JustinL45 months ago

When mixing larger jobs, how do you dry mix once the concrete mixer already mixed wet concrete?

racoontnn1 year ago
Very detailed and easy to understand about the batch of concrete. Thank you!
cjf2 years ago
Nice, thanks for this.
PeckLauros2 years ago
Really helpful. Thanks to share.
ringai2 years ago
I've read your countertop book. It's not a project I'll probably ever tackle, but it was extremely interesting, as was this instructable. Thanks for sharing more of your knowledge.
Horef2 years ago
wow thats some great instructable right there, thanks for the share!
dana-dxb2 years ago
thats a really helpful share a banch of thanx