Abstract
About ¾ of Botswana is covered by Kgalagadi Sands (KS). KS are invariably closely graded, consist of medium to fine sub-rounded particles and contain insignificant amounts of silty and clayey fractions. As a result of these physical and chemical properties, KS lack packing and therefore compactibility, have very high voids ratios and are cohesionless. Consequently, the wet and dry strengths (compressive, shear and flexural), dimensional stability, durability and aesthetics of building blocks moulded with KS alone, in the very rare cases where they occur with silts and clays of the right quantities and quality, are well below acceptable values.
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