To assess the performance of newly placed asphalt, which assessment method is preferred?

Core sampling is considered the preferred method for assessing the performance of newly placed asphalt because it provides a direct and reliable way to evaluate the density, thickness, and overall quality of the asphalt layer. By extracting a cylindrical sample from the pavement, inspectors can conduct detailed laboratory tests to determine important characteristics such as air void content, binder content, and compaction levels. These factors are critical for determining whether the asphalt meets the specifications and is likely to perform well over its intended lifespan.

Other assessment methods may provide some insights but do not offer the same level of precision or reliability. For instance, surface temperature readings can indicate the temperature of the asphalt during placement but do not assess the mix's density or structural integrity. Visual appraisal might help identify surface distresses or inconsistencies, yet it lacks the objective data that core sampling provides. Sound frequency testing can be used in some contexts to gauge quality, but it does not replace the comprehensive analysis achievable through core sampling. Overall, core sampling stands as the most thorough method for assessing newly placed asphalt performance.