What is the required ram pressure for gyratory compaction?

The required ram pressure for gyratory compaction is critical in ensuring that asphalt samples are compacted to the right density. This process mimics the compaction that occurs in the field when asphalt is placed and helps in assessing the performance characteristics of the asphalt mixture.

The correct answer specifies a ram pressure of 600 +/- 18 kPa. This value is based on established standards for gyratory compaction, ensuring that the samples are compacted effectively, which is essential for evaluating the mixture's behavior under load and its resistance to deformation. Following this standard helps ensure consistency and reliability in test results across different samples and is crucial for quality control in asphalt production.

Conversely, pressures that deviate significantly from this established value could lead to under-compaction or over-compaction, compromising the integrity of the tested sample and leading to inaccurate assessments of material properties. Therefore, adhering strictly to the specified ram pressure is essential for achieving valid and reliable test results in the asphalt compaction process.