PERCENTAGE REFUSAL DENSITY / PRD
BS 598-104, EN 12697-32, 13280-4
“””Percentage Refusal Density (PRD) is defined as the ratio of the initial dried density of the sample to the final density (refusal density) expressed as a percentage.
The sample bulk density is determined by weighing in air and water. It is then heated in a split mould and compacted to refusal using a vibrating hammer. The final density is obtained by weighing in air and water. “”