2007-03-18 20:36:18 · 2 answers · asked by Ando 1 in Science & Mathematics ➔ Chemistry
The raw materials used in cement production are widely available in great quantities. Limestone, marl, and chalk are the most common sources of calcium in cement (converted into lime through calcination). Common sources of silicon include clay, sand, and shale. Certain waste products, such as fly ash, can also be used as a silicon source. The iron and aluminum can be provided as iron ore and bauxite, but recycled metals can also be used. Finally, about 5% of cement by weight is gypsum, a common calcium- and sulfur-based mineral.
2007-03-18 20:48:33 · answer #1 · answered by Twisted Maggie 6 · 0⤊ 0⤋
According to the webpage below from Portland Cement, it is made of the following compunds:
Air: 6%
Portland Cement: 11%
Gravel or crushed stone (Course Agregate): 41%
Sand (Fine Agregate): 26%
Water: 16%
Aggregate, as defined in yourdictionary.com is:
"Composed of a mixture of minerals separable by mechanical means."
or simply
"The mineral materials, such as sand or stone, used in making concrete."
2007-03-18 20:45:58 · answer #2 · answered by Corestar 2 · 0⤊ 0⤋