The original Proctor test, ASTM D698 / AASHTO T99, uses a 4 inches mould which holds 1/30 cubic feet of soil, and calls for compaction of three separate lifts of soil using 25 blows by a 5.5 lb hammer falling 12 inches, for a compactive effort of 12,375 ft-lbf/ft³. ASTM Standard D698, (2007), Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort, ASTM International, West Conshohocken, PA, DOI: 10.1520/D0698-07E01 IHS, Industry Standards & Regulations. (