life cycle cost analysis: existing pavement design: $9"$ jointed plain slab, $4"$ Cement slab, $4"$ cement$-$treated base, silty clay subgrade, rural, $4-$lane divided highway, contraction joints are spaced at $18"$ on center, $1\mathrm{.}25$ dowels space at $12"$ on center provide the load the the load transfer, the pavement is $15$ years old. existing pavement condition: $7\%$ of the slabs in the outer lane experience medium to high severity transverse crack, random spalling along joints and cracks is present, $20\%$ of the joints exhibit low to medium severity faulting, the average PSI is $2\mathrm{.}8,$ the asphalt shoulder is in fair condition. Fearsible repair alternative: work item: replace cracked slabs $($FDR$)-$yes, Partial depth repairs of spalls$-$yes, stabilize slabs$-$yes, subdrains $-$yes, grind faults$-$yes, AC overlay$-$yes, replace outer lane$-$yes, PCC tied should$-$yes, initial service life years $-$ alternative $-7,$ alternative $12,$ alternative $20.$ assume an analysis period of $20$ years for an equal performance period. Assumea discount rate of $4\%.)$