Arizona ROC A-5 Excavating, Grading And Oil Surfacing Practice Questions - Arizona ROC A-5 Excavating, Grading And Oil Surfacing Examination Exam

Modified Proctor uses a 5.5 lb hammer falling 12 inches with 12,400 ft-lb/ft³ energy. Standard Proctor uses a 10 lb hammer falling 18 inches in 5 layers. Standard Proctor applies 5 times greater compaction energy than Modified Proctor. Modified Proctor uses a 10 lb hammer falling 18 inches with approximately 56,250 ft-lb/ft³ energy.