how do you mix concrete
Whether it’s for a slab to support a shed, for a walkway, or simply to anchor some fence posts, sooner or later you’re likely to need to mix yourself some concrete. Luckily, it’s easy to accomplish as long as you are careful to add no more water than necessary and you make sure to mix it well. Concrete is a combination of dry Portland cement, sand, and gravel, to which water is added. The water produces a chemical reaction in the Portland cement called hydration, which results in the formation of a crystalline matrix that binds all the ingredients together. Too much water in the mix results in a diffuse matrix, which yields weaker concrete. When the amount of water in the mix is kept to a minimum, the concrete will be optimally strong.
The easiest way to supply the concrete mix you need for your project is to buy dry premixed concrete in 60- to 80-pound bags from your local home improvement center, lumberyard, or hardware store. You may encounter more than one kind of concrete mix to choose from, as there are specialty mixes intended for specific circumstances (we’ll talk about those later), but for most purposes, the standard mix (sometimes called gravel mix) is the right one to choose.
An 80-pound bag of concrete mix will give you about 0.6 cubic feet of hydrated concrete. To estimate how many bags you will need for a slab or a walkway, multiply the length x width x thickness in inches, then divide the sum by 1728. This calculation gives the volume in cubic feet. Divide the result by 0.6 and round up to the nearest whole number—the resulting number is the number of 80-pound bags you need. If you are using the concrete to anchor posts you’ll just have to make a reasonable guess and be careful to keep the bags of concrete mix protected in case you wish to return some.
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