Paper presented at the 31st Annual Southern African Transport Conference 9-12 July 2012 "Getting Southern Africa to Work", CSIR International Convention Centre, Pretoria, South Africa.
G1 Crushed Stone for base course is not the same thing as crusher-run and it is not only a matter of density. It was developed during the late 1950’s from single stage crusher-run material that complies with Fuller curve particle grading and very strict material and construction specifications. Closure on this development and its capabilities was achieved during the South African Heavy Vehicle Simulator (HVS) test program during the 1980’s, resulting in the conclusive proof that a properly constructed G1 Crushed Stone layer can be used for pavements with a bearing capacity up to 50 million standard axles (MISA) repetitions. This discussion sketches this development but concerns itself mainly with the slush-compaction construction process of a G1 layer and those aspects which directly monitor its success.