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Construction and Demolition (CD) Waste as a Road Base Material for Western Australia Roads P. Jitsangiam1, H. Nikraz2 and K.Siripun3 1Lecturer, 2Professor, 3PhD Candidate, Dept. of Civil Engineering, Curtin University of Technology, Perth, Australia ABSTRACT This paper describes a preliminary examination of the engineering issues relating to the utilisation of CD waste as a base course material for Western Australia roads. A series of laboratory tests were performed during which Repeated Load Triaxial (RLT) tests were conducted to determine the resilient modulus and permanent deformation characteristics of CD waste and the commonly used base course material, Crushed Rock Base (CRB), as a reference material. A comparison of test results of both materials was then made. CIRCLY, a computer program based on the multi-layer elastic theory was used in the mechanistic approach of pavement design and analysis to determine the performance of a typical pavement model using CD as a base course layer. Based on the study’s findings, CD waste should be considered an adequate substitute for traditional aggregate in Western Australia road construction. Introduction CD waste, regarded as a material with limited economic potential, can be identified as potentially having suitable material characteristics for a base course aggregate and may provide an ideal solution to minimise the problems of virgin material exhaustion while providing other various economic and environmental benefits. This research aims to: determine whether the resilient modulus and permanent deformation behaviour of CD waste under dynamic loading is equivalent to or better than those of Crushed Rock Base (CRB), the natural aggregate that satisfies Western Australia Mainroads (MRWA)’s specifications (MRWA, 2003) for a base course material. provide information about CD waste to promote its usage as a road construction aggregate with confidence in terms of its engineering impacts. Materials CD waste The CD waste tha