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MUDROCK IN ROAD CONSTRUCTION : A REVIEW

The term "mudrock" or " mudstone" is preferred for the group of fine-grained sedimentary rocks commonly known as "shales". The classification, use and testing of mudrocks is reviewed with special emphasis on southern Africa, and it is concluded that research into test methods and criteria and the use of small quantities of waste such as mine slime and gypsum as admixtures to control weathering and volume changes, is justified. Successful use of potentially expansive mudrock in embankments can probably also be achieved by sealing it against moisture changes with soil, bitumen or plastic sheeting. Future use of synthetic, high-psv surfacing chips made from mudrocks is envisaged. (a). For the covering abstract of the conference, see IRRD abstract no. 218081. /TRRL/