Concrete is essentially what you get when you mix Portland cement, aggregate and water together (in the right proportions) and then let the mix harden. Looking at these different parts -. Portland cement (or just Cement) is basically made by grinding, heating in a kiln, then grinding again, the right kind of rocks.
How many pieces of Holland Stone does it take to do a square foot of paving? It takes approximately 4.6 pieces of Holland Stone to make a square foot of paving. Each pallet has 480 pieces of Holland Stone on it that should cover about 103 square feet of area.
How many sq feet are in a sq of shingles?   a square of shingles covers a 10 by 10 foot area, or 100 square feet. the actual area of the shingles will be greater, because they overlap.+ 4 others found this useful. Ginny Niemiec.Edit.88    Square feet is area, and area of a rectangle = LW   therefore, A=28x21   A=588. Edit. Share to: 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.