Volume 27, Issue 2 (March 1999)
Experimental System for Simulating Crack Propagation in Asphalt Pavements and Effectiveness of Geosynthetics in Crack Retardation
This paper presents the pneumatic moving wheel experimental system and its usefulness in simulating the role of geosynthetics (geogrids) in limiting crack propagation. The simultaneous development of rutting through the experiment was studied as well. The performance of the developed loading system showed that: (1) the moving wheel loading device provides a compact, convenient, simple, and rational experimental tool for investigating the effect of pneumatic wheel loading on the mechanical dynamic behavior of asphaltic layers; (2) two of the failure modes of asphaltic pavements, fatigue cracking and permanent deformation, could be assessed and measured simultaneously; and (3) the relative effect of geosynthetics reinforcement on the retardation of the development of the above distresses during service life was successfully measured to verify quantitatively the contribution of interlayer reinforcement toward the reduction of permanent deformation (rutting) and the increase of asphaltic surface layer life by retarding crack propagation.