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Large quantities of asphalt and concrete rubble are the result of extensive reconstructionhaving taken place and it is standard practice for AAS to recycle these materials into the newpavements being constructed. A mix of 60% concrete and 40% asphalt rubble is the standard forall CTB layers. Due to variations in strength of each particle, inherent to the recycling process, a10% variation in flexural strength is very likely to be present and the low subgrade strength caneven increase the in-situ strength variation. This variation, together with the sensitivity of cementbound materials to frequency and weight of loading as well as the development of the ultra-heavynew generation NLA types, was the motive to look for the alternative design as proposed.
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