Abstract
Cold recycled bound materials (CRBMs) provide an economic and environmental advantage for pavements since they decrease energy and raw material consumption. However, design methods for airfield pavements do not include key CRBM properties. In this paper an empirical-mechanistic method is used to study airfield pavement design with CRBM in order to develop design guidance. The aim of the paper is to obtain the inputs related to material properties needed for use in this method. For this purpose, CRBM containing reclaimed asphalt, with fly ash, cement and foamed bitumen as stabilising agents, was characterised. The methodology included indirect tensile stiffness modulus (ITSM) and indirect tensile fatigue tests (ITFT) in strain control mode. The inputs needed for a pavement design analysis with CRBM were then obtained. The results showed the importance of further study on CRBM fatigue to understand the behaviour of these mixes under cyclic loading.
Highlights
RESUMEN: Análisis del módulo de rigidez y la resistencia a fatiga de mezclas asfálticas recicladas en frio fabricadas con betún espumado para su uso en el diseño de firmes para aeropuertos
This study looks at foamed asphalt with cement, material which is classified in the UK as a cold recycled bound material (CRBM) [8, 11]
It would appear that CRBM with foamed bitumen has appropriate stiffness modulus for airfield pavement design
Summary
RESUMEN: Análisis del módulo de rigidez y la resistencia a fatiga de mezclas asfálticas recicladas en frio fabricadas con betún espumado para su uso en el diseño de firmes para aeropuertos. Cold recycling of asphalt is a proven technique that reduces energy consumption [5,6,7] This reduction is largely achieved by avoiding aggregate drying [8] and mixing the material at ambient temperature instead of 170°C-185°C, as required for hot mix asphalt (HMA) [9]. Life CRBM mechanical properties change over time [15] This phenomenon, during which the cohesion between the binder and the aggregates increases as the mixture loses water, is known as curing [16, 17]. No standard curing procedure has been established for CRBM; from previous research, it has been demonstrated that curing specimens fully wrapped at 20°C for 28 days is an appropriately conservative practice [16, 18]; this curing procedure was chosen for this study
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