Rehabilitation concrete pavement with asphalt reinforcement grid
Location of work/project:
Salgado - Brazil
The use of an asphalt reinforcement delays the development of reflective cracks significant.
Through this the service life of a pavement is considerably extended and the service intervals will be appreciably increased.
In 2001 the existing access to an aircraft maintenance hangar had to be resurfaced after more than 40 years of use. The design involved the installation of a new 50 mm asphalt layer on the existing pavement. In order to prevent the propagation of the expansion joints from the concrete slabs into the new asphalt layer, the asphalt reinforcement, HaTelit® C 40/17, was to be installed, in order to extend the fatigue life of the rehabilitated pavement.
First an asphalt levelling course was installed on the existing concrete pavement, as the asphalt reinforcement, HaTelit® C 40/17, must always be placed between two bituminous layers.
The HaTelit® C 40/17 was installed on the levelling course, in 1.0 m wide strips, only over the expansion joints.
The outer part, where the planes normally do not taxi, was left unreinforced. Afterwards a 50 mm asphalt layer was installed on the HaTelit®.
In October 2007, approx. 7 years after the rehabilitation, the first assessment of the pavement took place.
The expansion joints in the unreinforced areas had already propagated to the top of the surfacing. The green, visible in the developed cracks, led to the conclusion, that these cracks had existed for some time.
In contrast to this, the HaTelit® reinforced areas did not show any indications of cracking.
The propagation of the expansion joints in the unreinforced areas can only be ascribed to the different temperature behaviour and the consequential horizontal stresses. As well as the temperature induced horizontal stresses the HaTelit® reinforced area was also exposed to the dynamic loads from the passing planes.
This example again clearly demonstrates, that the use of the asphalt reinforcement HaTelit® C 40/17 delays the development of reflective cracks. Through this the service life of a pavement is considerably extended and the service intervals will be appreciably increased. The associated savings lead to a considerable reduction of costs on asphalt pavement maintenance.
The use of HaTelit® C 40/17 is a technical proven and economically solution.