Validating Newly Developed Criteria of Stripping Prediction Using Egyptian Mixes
Abdel Zaher Mostafa1, Ahmed El-Desouky2
1Abdel Zaher Mostafa, Associate Professor, Department of Civil Engineering, Mataria School of Engineering, Helwan University, Cairo, Egypt.
2Ahmed El-Desouky, Associate Professor, Department of Civil Engineering, Military Technical College, Cairo, Egypt.

Manuscript received on October 04, 2015. | Revised Manuscript received on October 09, 2015. | Manuscript published on October 31, 2015. | PP: 7-12 | Volume-2 Issue-11, October 2015. | Retrieval Number: K03441021115
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Abstract: Many transportation agencies in North America and Egypt have reported that stripping can be a significant issue in most pavement distresses such as rutting, fatigue cracking, ravelling, potholes, and flushing. In addition, Canadian airfield asphalt concrete pavements, especially in the Atlantic, Central, and Pacific regions, show evidence of stripping due to moisture susceptibility. It is recognized that density and in-place air-void content (AVC) are important parameters of a properly constructed asphalt pavement. The first objective of this research was to investigate different factors that may affect stripping evaluation. During the development stage samples representing four Canadian airfield mixes were prepared and tested to investigate the effect of soaking duration, air voids content, and soaking temperature. The results of the air-void investigation, which were compatible with the concept of Pessimum theory, showed that samples should be prepared with an air-void content of more than 8.5%, with a soaking duration of 6 to 8 hours and soaking temperature of 70 °C. The second objective of this research is to validate the developed criteria of stripping prediction on Egyptian mixes. The validation was carried out using Egyptian mixes with five different anti-stripping agents and it showed that the developed stripping evaluation guidelines has the ability to predict the effect of anti-stripping agents on the retained tensile strength of the examined mixes.
Keywords: Asphalt Mixtures, Evaluation, Field, Laboratory, Stripping, Testing Procedures.