Johan Gerber, Zutari (Pty) Ltd
Abstract and Videos
The video, Chip Seal Construction Process, summarizes the construction process of a triple seal in South Africa. A triple seal has three layers of aggregate; 20mm + 7mm + 7mm; and three spray coats of binder, typically but not restricted to; S-R1 + S-E1 + Cat65%. The second video, Abaqus 3D Chip Seal Model, is a digital copy of the chip seal construction process. The chip seal model was developed in Abaqus, has a load consisting of a 20 kN truck wheel inflated to 800 kPa, rolling at 10 km/h. Stress and strain results were obtained at the aggregate-binder interface as an approach to quantify the environment conducive for ravelling.
Chip Seal Construction Process:
Abaqus 3D Chip Seal Model:
Why do this?
Observe behavior that is difficult to measure in the field.
Use this approach to refine aspects of chip seal design.
Inexpensive method to compare Chip Seal designs.