the long-term performance of a flexible pavement is related to the magnitude of the transient deflections which occur under traffic.measurements made over the past 15 years on experimental pavements have shown that it is possible to relate the deflection measured under a 'standard'wheel-load to pavement life in terms of the cumulative commercial traffic carried. deflection criteria curves of this type have been developed for pavements with crushed stone,rolled asphalt,tarmacadam and cemented bases.under rolled asphalt surfacings.the data reported in this paper have been collected from the laboratory's full-scale pavement design experiments,and particularly from the alconbury hill experiment constructed in 1957.the deflection measurements have been made with the deflection beam. the deflection criterion curves for pavements with crushed stone,rolled asphalt and coated macadam bases are identical within the limits of the experimental accuracy,but acceptable deflection levels are much lower on pavements with cemented bases. the paper discusses the way in which deflection criterion curves can be used to estimate future performance and future maintenance requirements for flexible pavements. (a)

Want to know more about this project?