1 Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete.  Check the forms for level (¼ inch for every 12 feet is sufficient to allow for rain run-off). Patio and sidewalk forms should slope evenly away from structures.
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There is nothing more boring than a plain slab of poured concrete for a patio. But if you insist on using it, consider a stamped pattern that is dyed with a coloring agent for a more natural look. Be aware of the maintenance issues with this type of patio. You have to reapply the coating about every two years so it doesn’t lose its color. They can also show surface cracks and the color wears off in heavily trafficked areas. In frost-free zones, concrete is often the material of choice..
http://www.hgtv.com/remodel/outdoors/choosing-materials-for-your-patio
For a completely natural look, nothing beats natural stone for a patio. There are many different types of natural stone to choose from including flagstone, slate, bluestone and limestone. Natural stone costs more because it is quarried and has to be trucked in adding transportation costs.
http://www.hgtv.com/remodel/outdoors/choosing-materials-for-your-patio
Pouring & Finishing Concrete Slabs. Concrete is one of the most economical, versatile and durable building materials available. Build a sidewalk, patio, or floor with QUIKRETE concrete mixes no matter your skill level.
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Determine where you want to construct a concrete patio, how large it will be, and its exact dimensions. The size of the patio determines the amount of concrete required and whether you will need a mixer. If the patio is too large in area, it might not be an easy DIY job. The location is also important.
http://www.wikihow.com/Pour-a-Concrete-Patio
Prior to placing concrete forms: 1  Construct the form with 2x4 or 2x6 lumber and secure in place by wood stakes and deck screws.  Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete.
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How to Pour a Concrete Patio. Patios can be wonderful additions to any home, but homeowners generally have to weigh the benefits of having a patio with the expense of having someone do the construction. To save on this expense, however, consider making a concrete patio one of your next do-it-yourself projects.
http://www.wikihow.com/Pour-a-Concrete-Patio
1 Construct the form with 2x4 or 2x6 lumber and secure in place by wood stakes and deck screws.  Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete.
https://quikrete.com/athome/video-pouring-concrete-slabs.asp
1 If mixing by hand, you can put the concrete mix into a mortar tub or a wheelbarrow. Mix with a shovel or a hoe. Make sure that when mixing concrete by hand you wear gloves and protective eye wear.  If using a mixer, make sure you can move the mixer into the area where you are building the patio.
http://www.wikihow.com/Pour-a-Concrete-Patio
There are many different types, strengths, and compositions of concrete, each with characteristics that make them perform better for different applications. Here are a few examples: Strength is usually determined by compression testing, and is expressed in Pounds per Square Inch (PSI).
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what type of concrete for patio
For Patio plain slab of poured concrete is used. A plain slab of poured concrete is a type of concrete for the patio. QUIKRETE concrete is used for the Patio.   One can use Quikrete concrete for patio.