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$(1)$ What shappen when keep the asphaltenes concentration constant and change the other components concentration P$.57$

Explain you naw that the aromatic ratio for material is $0\mathrm{.}7$ Can you classify this material as bitumen? Whay? use Table $($u$-1)$

How we can get a harder bitumen by changing of the quantifies of is ingradients? $,$ P$.57$

$(4)$ Sample bitumen type $(\frac{35}{50})$ penteration with penetration value equal $40$ dmm and seftening point $55.$ what the all.walle value for penctration and softening point after TofT? use Table $(5-1)$

what is the percent aromatie Ratio in bitumen?

$P.51$