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Test Method Title
Standard Test Method for Determining Rock Quality Designation (RQD) of Rock Core
Description of Test
RQD denotes the percentage of intact & sound rock retrieved from a borehole of any orientation. All 100 mm (4 in) or longer pieces of intact and sound rock core are summed and divided by the total length of the core run. Judgment may be required when determining "intact and sound."
Preferred Test Sample Size
Rock core drill run
Number of Test Specimens
Test Specimen Size
One complete run, as determined by the engineer. Either a drill run, a complete core through one type of rock, or a complete run through a selected zone of concern.
Classification, index, logging, quality, rock core, RQD
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