What does 95% compaction mean?
95% Compaction – This term is usually found in the contract specifications of a project. It is a value recommended by the structural or geotechnical engineer that is necessary to ensure adequate mechanical consolidation of structural soil backfill. The value refers to a percentage of the oven dry density of a particular uniform soil material as determined in the laboratory using one of the specified test methods. The two methods commonly used are: a. Standard Method; ASTM D 698, uses the equivalent energy or compactive effort of 14,176 ft.-lbs./sq.ft./1 ft. layer. b. Modified Method; ASTM D 1557, uses the equivalent energy or compactive effort of 64,439 ft.-lbs./sq.ft./1 ft. layer.
