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Specific creep-adjusted values may be estimated but the long-term value may reasonably be taken as twothirds of the Initial Tangent value. 4 Concrete fatigue A concrete fatigue model is an important element linking together index test results and the structural capacity of the pavement. It is well understood that repeated loads produce tensile stresses which then induce concrete cracking and pavement failure. Pavement life is linked to the magnitude of stress in relation to concrete strength. The difficulty in design is knowing how to link estimated stresses to the number of load cycles which induce failure, and then producing a reliable estimate of pavement life.

Controlling early-age cracking in continuously reinforced concrete pavement, Transport Research Report 1684, Washington DC, January 1999. 8. M. , A case study into the effects of reinforcement and aggregate on the performance of continuously reinforced concrete pavements, 4th European Symposium on Performance of Bituminous and Hydraulic Materials in Pavements, BITMAT 4, Nottingham, UK, April 2002. 9. , Cracking and corrosion in continuously reinforced concrete pavements, 5th International Conference on Concrete Pavement Design and Rehabilitation, Purdue University, April 1993.

Testing and specification 39 CEB Model Code 90 [2] offers the following relationship to allow the estimation of test strength at key dates after the construction of a pavement. 38 for slow hardening cement. 10 suggests that the 28-day strength can be factored using the following coefficients for OPC mixes. 20 × 28-day strength Young’s Modulus for uncracked concrete The stiffness or Young’s Modulus of an uncracked cement bound material cannot be easily directly measured. Standard relationships linking stiffness to strength are accepted as a realistic measure of stiffness.

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