Question $1(5$ points$)$

For a PCC pavement $(D=10-$inch$),6,455,00018-$kip single axle load $($ SAL $)$ applications are required to reach a $p_t$ of $3\mathrm{.}0.$ The same pavement requires $1,910,000$ load applications of a $24$kipSAL to reach a $p_t$ of $3\mathrm{.}0.$ Determine load equivalency factor $($LEF$)$ for $24$ kips SAL.

Question $2(10$ points$)$

Table $1$ shows current traffic levels based on a $7-$day count. Determine the number of equivalent standard axle loads $($ESALs$)$ for a design period of $25$ years. Assume a $2\%$ growth rate and a PCC pavement thickness of $10-$inch and terminal serviceabilities of $2\mathrm{.}0,2\mathrm{.}5,$ and $3\mathrm{.}0.$ Based on your engineering judgment, comment on the relationship between traffic and pavement serviceability index $($PSI$).$ Make necessary assumptions.

Table $1$ Seven$-$day axle distributions

$\backslash$table$[[\backslash$table$[[$Load Bin$],[($kips$)]],$Single Axles,$\backslash$table$[[$Load Bin$],[($kips$)]],$Tandem Axles$],[10-12,100,12-16,3],[12-14,200,16-20,30],[14-16,200,20-24,40],[16-18,1000,24-28,900],[18-20,400,28-32,1000],[20-22,100,32-36,500],[22-24,50,36-40,200],[24-26,5,40-44,100],[26-28,5,44-48,20],[28-30,5,48-52,1]]$

Note: Use AASHTO LEF tables provided at the end of the homework