Standards Development

Scope

This standard establishes the procedure for determining fracture cracking resistance on geogrid used for reinforcement on asphalt concrete. Geogrids can either be composite or homogeneous polymeric material composition. This standard covers the test loading, preparation of specimen, recording of data, and calculation and expression of results.

Purpose

Geosynthetics has been widely used as a reinforcement on flexible pavements. The increase vehicular loading, traffic volume, and abrupt climate change has led to crack formation that raise passenger discomfort and compromises safety from deep potholes. To mitigate this occurence, geosynthetics are used to absorb tensile strain, and function as a stress absorbing material with reinforcing capabilities. Thus, increasing durability (crack resistance) of flexible pavements and prolonging its life. There has been a great deal of use on geosynthetics in between asphalt coarses circulating in Europe, America and Asia.

Although widely used in the market as an asphalt concrete reinforcement, the standard test procedure for geosynthetics focuses solely on the material and not on the composition of “geosynthetic - asphalt concrete”. The current standard also provides a static displacement test procedure; however, to simulate the conditions on actual road vehicular loading, dynamic loading should be considered.

Therefore, in this standard, the geosynthetic that has been actively discussed for application to asphalt concrete pavement is targeted. We propose a method of evaluating the fatigue properties of geogrid under dynamic loading to enable researchers and related experts to perform a practical performance evaluation similar to actual road scenarios.