$3\mathrm{.}1.$ Explain the difference between hydraulic and non$-$hydraulic cements.

$3\mathrm{.}2.$ Why is lime important in the manufacturing process of portland

cement?

$3\mathrm{.}3.$ Discuss the uses of the following: pozzolan cements, slag cements,

natural cements, portland cements

$3\mathrm{.}4.$ List eight types of portland cement and explain their uses.

$3\mathrm{.}5.$ Explain how the following compounds affect the character of portland

cement: $($a$)$ tricalcium silicate, $($b$)$ dicalcium silicate, $($c$)$ tricalcium

aluminates, $($d$)$ tetracalcium aluminoferrite, and $($e$)$ alumina.

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