Question $1(25$ Marks$)$

A particular brand of Portland cement using limestone$,$ kaolinite and sand. The three raw materials are pre$-$calcined at $950C,$ which drives off any carbon dioxide and water chemically with the minerals. The bulk oxide composition of the resulting clinker is shown in Table $1.$

Table $1$: Bulk oxide composition

$\backslash$table$[[$Oxide$,\%$ mass,$\backslash$table$[[$Molecular$],[$weight$]]],[$CaO$,66\mathrm{.}6,56],[Si{O}_2,21\mathrm{.}5,60],[A{l}_2{O}_3,5\mathrm{.}2,102],[F{e}_2{O}_3,2\mathrm{.}8,160]]$

The free lime content of the clinker is $1\mathrm{.}0\%($molecular weight $=80),$ and if gypsum has not yet been added.

a$)$ What proportions of the four main cement compounds are potentially present? Your answer should be given to one decimal place.

b$)$ Identify the type of cement produced and describe the probable characteristic of the cement.

c$)$ Explain briefly the suitability of the cement for the production of concrete.