FORTGRID ASPHALT GEOMETRIC FOR REFLECTION CONTROL OF CRACKING IN ASPHALT LAYERS

Problem:

As a result of the implementation of lifts to protect pipes along a pavement structure, changes in rigidity occur due to the installation of a reinforced concrete slab on the support platform of the projected pavement. By placing the asphalt layer on a surface susceptible to cracking or changes in rigidity, the stresses and deformations generated by the passage of vehicles can progress rapidly towards the wearing layer. This is where crack control geogrids play a crucial role (see Figure 1).

 

 

 

 

Solution:

Due to the changes in stiffness, it is recommended to implement a geogrid type FORTGRID ASPHALT in order to control the reflection of the discontinuities that occur at the granular level due to said changes in rigidity. Installing a geogrid FORTGRID ASPHALT between the asphalt layer or between asphalt base and asphalt layer, generates a biaxial projection of the aforementioned forces on its plane, managing to expand the thin resistant prism to one with greater volume, which means a greater mechanical offer to tolerate the forces that occur. .

 

 

 

 

 

The geogrid FORTGRID ASPHALT It reinforces the lower plane of the asphalt overlay, allowing direct contact of the materials through its openings, with which the asphalt layers are structurally linked and reinforced. This effect reorients the path of the shear stresses and distributes the stress over a greater mass of material.

 

 

Thanks to its resistance to cyclic loading, high temperatures and low installation damage, FORTGRID ASPHALT geogrids constitute an advanced alternative for reinforcing asphalt overlays. Its greater resistance to cyclic loading allows for a noticeable improvement in resistance to crack reflection. In addition, its balance between open area and resistance offers high shear resistance (adhesion) at the interface, guaranteeing results for the useful life of the overlays. Geogrids for control of cracks They can be installed on any type of surface, ensuring the necessary adhesion. Verification of the amount of binder irrigation must be determined in an in situ adhesion test by varying the amount of asphalt binder. It is recommended to use fast breaking cationic asphalt emulsion. The adhesion test must be done in order to find the breaking time of the emulsion and the optimal dosage, which will be the one that has a tear resistance greater than or equal to 5.0 kg.

 

Adhesion test: