In parts of Namibia, Botswana and South Africa the only economically available road construction materials often contain excessive amounts of highly soluble salts such as NaCl (common table salt) and/or gypsum (CaSO4•2H2O) ...

The purpose of this experiment on the Serowe-Orapa road in Botswana constructed in 1989 was to evaluate the performance of untreated, Kalahari fine red sand against similar sand treated with 2,5% bituminous emulsion and ...