As I've mentioned in some of my previous post Concrete is made up of mainly three essential parts , Stone , sand and Cement.
Some of the uses of Concrete-
Foundation footings
Floor slabs
Beams
Concrete lintols
Depending on the end usage of the concrete and specification of you engineer the concrete strengths will be adapted.
Concrete strengths ate measured in Mpa, the lower the Mpa the weaker the mpa the lower the strength.
Mpa strengths most commonly used is 15mpa , 20 mpa and 25mpa the more strain the concrete will take the higher the Mpa.
Most concrete would also require some form of steel reinforcement which will be specified by your engineer.
Concrete are also mixed in two primary ways
Firstly by hand or small concrete mixer on site.
Or by what is commonly known as Ready mix which is delivered to site in a truck.
Depending on your needs , budget and time availability you'll make your choice.
It is till a point that is being argued that hand mix is cheaper than concrete although more labour intensive, and for obvious reasons the latter will take more time.
Hope this gives you some more insight on the make-up and usage of concrete.
Please see attached image of a concrete mixer on site.
Regards
