The Transport Research Laboratory publication RR87 (Mayhew & Harding,
1987) is, like LR1132, empirically based, taking account of full-scale concrete
road experiments. The document concentrates on performance data for jointed
unreinforced concrete (URC) and jointed reinforced concrete (JRC) slabs. The
sites evaluated had service lives of up to 30 years and were subject to traffic
loadings of over 30 million standard axles.
Mayhew and Harding derived two equations, each estimating pavement life
based on a set of independent variables.
For URC pavements: