what is the mix ratio for concrete to sand for doing curbing?

Answer 1

A properly designed concrete mixture will possess the desired workability for the fresh concrete and the required durability and strength for the hardened concrete. Typically, a mix is about 10 to 15 percent cement, 60 to 75 percent aggregate and 15 to 20 percent water.

Answer 2

Very "dry" mixes are hard to finish so you can achieve a great finish by adding a water reducer to your mix. This makes the mix behave like it is much wetter. So the mix doesn't necessarily have to be "dry" to be strong. It just needs to have less water. Trowelling a stiff dry mix takes more work and sometimes can't get out all the imperfections.....i like the curb to be a little creamier with the water reducer admix added in. That way the curb will be just as strong as the super stiff mix, but will finish like a wetter mix.

Using coarser sand you can also get away with using less water. Fine sand absorbs much more water and can make the concrete weaker due to the excess water that is needed to make the mix workable. But over-doing the water will produce a gooey mix that is no longer workable for an extruded curb.
Water reducer will especially help strengthen a mix that uses finer sand. Finer finishes and better stamp impressions, looks beautiful...just be careful with the fine sand. Use less sand and a little more cement to compensate for the added surface area of the fine sand.

Answer 3

One shovel full of cement to six shovels full of sand. Try to keep the shovel loads all equal. Add water and keep in mind that the drier the mix, the stronger the curb.

Answer 4

we use the same mix out of the concrete truck as we use for driveways.....3000 psi on a 3 slump


lic gen. contractor