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An investigation into the fatigue of welds in an experimental orthotropic bri…
Trrl Lr 629 After four years of normal trafficking, cracking occured in welded connections on an experimental orthotropic bridge deck panel. These connections were fillet welds between the trapezoidal stiffeners and the cross-beam, the stiffeners being fitted between cross-beams. Initial investigations showed that the cracking was due to fatigue of the weld metal accelerated by factors attrr…
Trials of experimental orthotropic bridge deck panels under traffic loading
Two experimental orthotropic deck panels were studied while subjected to normal traffic on a trunk road. The behaviour of 38 mm mastic asphalt and 9mm resin-based surfacings were compared. The stresses generated by moving vehicles were measured and found to be considerably reduced on the panel surfaced with asphalt relative to the panel surfaced with resin-based materials. The composite action …
Deformation testing of dense coated macadam: effect of method of specimen com…
The report describes a laboratory investigation into the effect of method of preparation of the test spicemens on the assessment of deformation behaviour of a dense roadbase macadam. Spicemens were prepared from material compacted in a laboratory rolling-wheel compactor, by compacting in a mould using a Proctor Hammer and from material laid and compacted using full-scale equipment. The results …
TRL 666 Durability of Continously Reinforced Concrete Surfaced With Asphalt
The report presents designs for durable continously reinforced concrete pavements (CRCP) with low noise asphalt surfacing. It is based on research and measurements made on full-scale road sites to determine the amount of reflection cracking in the concrete, and the seasonal thermal movement. These showed that thin surface course systems can be successful in bridging cracks in sound CRCP. Using …
Evaluation of stone mastic asphalt (SMA): a high stability wearing course mat…
The report describes the evaluation of stone mastic asphalt (SMA). SMA was originally produced in Germany as a proprietary wearing course material, but recognition of its excellent perfomance led to its standardization in 1984. SMA has been found to be very deformation resistant due to its stable aggregate skeleton structure. The voids in the stone matrix are filled with a mastic of bitumen/cru…
