Abstract
The discussion follows an earlier paper, which described work carried out at Nottingham University, from which it was concluded that the non-woven fabrics tested did not improve flexible pavement performance. This conclusion is in agreement with observations made following trials carried out at the TRRL, described in the paper, in which full-scale tests evaluated the structural behaviour of a pavement containing a strong woven fabric in comparison with a control pavement without a fabric. In the TRRL trials the pavements had a design thickness of 160mm of dense bitumen macadam on 300mm of crushed granite sub-base. Loading procedure employed a twin-axle lorry with a 10t load on the rear axle for the first 4600 passes increasing to 13t for a further 7700 passes. Pavement structural behaviour was assessed by measuring transient deflection, transverse profile, subgrade strain and transient strain. It was concluded that while such fabrics do not reinforce permanent pavements, they could be of use in road construction on wet sites or on weak soils. For details of the earlier paper see TRIS abstract no. 368806. (TRRL)
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