Ken,
Attached links are some articles by Ward Malisch, a professior I was fortunate enough to have back in the 70’s when I was in college, you may find useful in your teaching assignments in SA.
http://www.concreteconstruction.net/images/Soil%20Compaction%20in%20Residential%20Construction_tcm45-341851.pdf
http://www.concreteconstruction.net/Images/Compacting%20Soils%20and%20Subbases_tcm45-343018.pdf