STIFFNESS AND DEFORMATION PROPERTIES OF A COMPOSITE ASPHALT CONCRETE SURFACE PAVEMENT LAYER CONTAINING CEMENT COATED AGGREGATES

摘要

This paper reports the finding of an extensive study on the design and characterization of asphalt concrete composite surface layer made from Open Graded Friction Course asphalt mixtures (OGFC) containing modified secondary aggregates, with cement paste, for use as road pavement material. Three aggregate types were considered in this study; Arcow (as a control), Croxden aggregates (as a secondary material) and cement coated Croxden aggregates (as a material under investigation). One aggregate gradation was designed for all aggregate types and the adopted aggregate gradation had a nominal maximum aggregate size of 14mm. The binder used was a 100/150 pen binder. The primary objective of this research study was to investigate the mechanical and deformation properties of pavement layer made from cement coated secondary aggregates under different loading and traffic environmental conditions. Stiffness and deformation properties of the control and new composite pavement layer were measured using triaxial and wheel track at testing temperature of 20°C, 30°C and 45°C. The results confirmed that the new composite pavement layer is suitable for use in road surfacing materials and thus significant economical and environmental benefits can be achieved.