$(1)$ What ishappen when keep the asphaltenes concentration coustant and change the other components concentration

Explain you naw that the aromatic ratio for materiak is $0\mathrm{.}7$ Can you classify this material as bitumen? wha? use Table $(4-1)$

$(3)$ How we can get a harder bitumen by changing of the quantifies of is ingradients?

$(4)$ sample bitumen type $(\frac{35}{50})$ penteration with penetration Value equal $40$ dmm and soffening point $55.$ what the allowable value for penctration and softening point after ToFT? use Table $(5-1)$

what is the percent avomatic Ratio in bitumen?