Asphalt Cold Mixtures for Pavement Rehabilitation: Curing and Mechanical Characteristics

Abstract

This paper presents the main results achieved in a research study concerning pavement rehabilitation using asphalt cold mixtures, specifically the application of “new” asphalt cold mixtures as overlays and in situ cold recycling of existing pavement layers with bitumen emulsion. In the frame of this research project, a study was performed comprising the haracterization of the materials used in the production of selected cold mixtures (both “new” materials and old materials used for recycling), and the mixtures produced. Studies were
performed about the most appropriate methods for representation of the in situ conditions in the laboratory. Furthermore, the effects of the curing process in the mechanical behaviour of the bituminous mixtures were also studied through laboratory testing. A comprehensive laboratory test programme was established, with the purpose of assessing the mechanical
characteristics of dense graded asphalt cold mixtures, especially those related to pavement performance.