Paper by BIRMANN from ISCR 7th 1994 Vienna Austria
To improve the surface quality or the water drainage and the service life of a mediocre damaged concrete pavement, this pavement can be overlaid with a 4 to 6 cm thick asphalt layer. The status of the concrete pavement and of the joints with respect to potential reflection cracks needs to be assessed by surveys and deflection measurements. The relative vertical displacement of the slabs edges at the joint can be measured by the modified Benkelmanbeam while a 50-kN--wheel load is passing the joint. Based on experience and the measured values of dowelled joints in highways and on the theoretical knowledge, the following recommendation is given: Using a stress absorbing membrane interlayer (SAMI) with 0.7 kg/rn 2 below the joiritless asphalt overlay, the displacements should nnt exceed 0.06 mm. When joints are sawed in the asphalt overlay matching the joints of the concrete pavement and sealed, those joints and cracks with displacements greater than 0.1 0 mm are to be determined and additionally dowelled or tied.
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