Question $6[20$ marks$]$

Describe both the factors that influence the durability of asphalt materials and the effect each factor has on the material. $[4$ marks$]$

Describe the Marshall Method procedure. $[4$ marks$]$

The following table lists data used in obtaining a mix design for an asphalt paving mixture. If the maximum specific gravity of the mixture is $2\mathrm{.}41$ and the bulk specific gravity is $2\mathrm{.}35,$ determine:

a$)$ the bulk specific gravity of aggregates in the paving mixture,

b$)$ the asphalt absorbed$,$

c$)$ the effective asphalt content of the paving mixture,

d$)$ the percent voids in the mineral aggregate VMA. $[12$ marks$]$

$G_{sb}=\frac{P_{ca}+P_{fa}+P_{mf}}{\frac{P_{ca}}{G_{\text{b}\text{c}\text{a}}}+\frac{P_{fa}}{G_{\text{b}\text{f}\text{a}}}+\frac{P_{mf}}{G_{bmf}}}$

$G_{se}=\frac{100-P_b}{(\frac{100}{G_{mm}})-(\frac{P_b}{G_b})}$

$G_{se}=\frac{100-P_b}{(\frac{100}{G_{mm}})-(\frac{P_b}{G_b})}$

$P_{ba}=100\frac{G_{se}-G_{sb}}{G_{sb}{G}_{se}}{G}_b$

$P_{be}=P_b-\frac{P_{ba}}{100}{P}_s$

VMA$=100-\frac{G_{mb}{P}_s}{G_{sb}}$

Table $6\mathrm{.}1$ Mix Composition

$\backslash$table$[[$Material$,\backslash$table$[[$Specific$],[$Gravity$]],\backslash$table$[[$Mix Composition by$],[$Weight of Total Mix$]]],[$Asphalt cement,$1\mathrm{.}02,6\mathrm{.}40],[$Coarse aggregate,$2\mathrm{.}51,52\mathrm{.}35],[$Fine aggregate,$2\mathrm{.}74,33\mathrm{.}45],[$Mineral filler,$2\mathrm{.}69,7\mathrm{.}8]]$

End of the coursework

MODULE CODE: CEN$310-22-23/$S$2$ SEMESTER$-$END PROBLEM$-$SOLVING PRACTICE

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