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Concrete overlays bonded to existing rigid pavements are sometimes used under certain conditions. By bonding the concrete overlay to the existing rigid pavement the new section behaves as a monolithic slab. In FAARFIELD, a bonded overlay can be designed as a new rigid pavement by treating the existing concrete surface and the concrete overlay as a combined single layer. The flexural strength used in the FAARFIELD computation should be the strength of the existing concrete. The thickness of the bonded overlay required is computed by subtracting the thickness of the existing pavement from the total thickness of the required slab as computed by FAARFIELD:echhh
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