What is the ideal volume of voids for laboratory compacted asphalt specimens?

The ideal volume of voids for laboratory compacted asphalt specimens is typically around 4%. This percentage of air voids is crucial as it balances the need for adequate viscosity and durability in the mix while providing enough air space to accommodate the thermal expansion of the asphalt. A void content of about 4% helps prevent issues such as moisture infiltration and reduces the risk of rutting and fatigue cracking in the final pavement.

This 4% target is based on achieving optimal performance of the asphalt mixture. It ensures that the asphalt binder adequately coats the aggregates without being overly saturated, thus enhancing the overall strength and longevity of the pavement. Maintaining this ideal volume can lead to better resistance to traffic loads and environmental conditions, ultimately contributing to a more durable and resilient roadway.