Q:

# What is the formula for concrete calculations?

A:

The formula for concrete calculations is (length x width x depth) divided by 27. The result of this formula provides the number of cubic yards of concrete needed. The measurements must be in feet in order for the equation to work.

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Concrete is comprised of several components including water, Portland cement and aggregate, which is granular material such as sand and rocks. Portland cement commonly comes in a powdered form and is the binding agent in the mixture. Proper hardening of a mixture requires a humid environment to achieve optimal strength. In environments where it is difficult to ensure constant humidity, such as the outdoors, water is sprayed on the concrete, which is covered with a plastic sheet. The aggregate materials provide reinforcement and determine the density of the finished product.

There are a variety of concrete densities. Concrete for standard use is premixed with inexpensive lightweight aggregate such as gravel. High-density concrete require heavyweight aggregates such as barites, magnetite, iron or lead. The use of high-density concrete occurs in the construction of nuclear facilities and places where it is necessary to have high structural integrity while taking up little space. It is more costly than standard concrete, but provides superior shielding against radiation while being more cost effective than lead or steel alternatives.

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## Related Questions

• A:

A concrete slab calculator works by calculating the amount of concrete needed in cubic feet by multiplying together the values in feet for the length, width and depth of the concrete slab. The result is divided by 27 to get cubic yards.

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• A:

The price per cubic yard of concrete is determined by multiplying the desired finished length, width and depth of the concrete and dividing that number by 27. This depends on the type of concrete being used, how much is required and whether it is delivered, according to Family Handy Man.

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• A:

A steel channel with a depth of 15 inches may have a width of 3.716, a thickness of .716 and a sectional area of 14.7 inches. Alternately, a 15-inch deep steel channel may have a width of 3.4, a thickness of .4 and a sectional area of 9.96 inches.