Over many years, it has been demonstrated that the application of engineering judgment has been a significant aspect of the continuing use of naturally occurring materials in roads and regional airports in Western Australia. The information contained in this document has been assembled so that, where possible, engineering judgment can be supported by relevant tests and an understanding of the significance of the test results. Materials such as laterite and calcrete (pedocretes), clayey-sands and scree gravels, are discussed against a background of "conventional" selection criteria, strength tests and critical service applications.
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