Q:

What are the different grades of concrete?

A:

Concrete grades are determined by concrete's compressive strength 28 days after it has been poured. The strength is measured in psi, or pounds per square inch.

The greater the psi rating on a mix of concrete, the stronger the concrete will be after it has been poured and set. The required strength of the grade itself is largely dependent on its intended use. For most residential uses, the minimum concrete grade is 2,500 psi. Commercial work, on the other hand, will typically require a grade of 4,000 psi or higher. Any type of concrete that is rated higher than 6,000 psi is considered to be high-performance concrete. This grade is typically set aside for heavy-duty commercial projects, although special projects such as skyscrapers can require concrete that has a grade of at least 10,000 psi.

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    What is concrete made of?

    A:

    Concrete is composed of aggregates, which can be any or a combination of sand, gravel or rocks that is held together by cement. The cement itself, when mixed with water, serves as a paste that holds all the components of the concrete together once the cement sets  and hardens.

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    How do you color concrete?

    A:

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    A:

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    How thick should a concrete floor be?

    A:

    A concrete floor should be about 4 inches thick if it is in a residential home or building. For a building supporting heavy loads, 5 to 6 inches is the recommended thickness. A good quality concrete floor will have even thickness throughout.

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