Kenlayer pavement design software
Resistance to permanent deformation, fatigue, temperature susceptibility and durability results show that these materials give reasonable performance however, they differ from conventional hot mixes. With the results obtained from the laboratory investigation it was concluded that CRBM mixes have acceptable properties for use in airfield pavements.
#Kenlayer pavement design software software#
Then the software could be used to model pavements containing CRBM and with the knowledge gained in the laboratory about its behaviour, establish layer thicknesses to bear traffic during the pavement design life. These cases were compared to those of a well-established airfield design guide, namely DMG 27. For this purpose, 96 case studies were analysed with HMA, with different aircraft types, traffic and subgrade conditions. The first step was to ascertain Kenlayer adequacy and establish inputs related to loading, traffic and subgrade condition. These specimens were tested to analyse densities, air voids, stiffness, strength, permanent deformation and fatigue.įor developing a new design methodology, Kenlayer was used to analyse strains and stresses within the airfield pavement. RAP, fly ash, cement and foamed bitumen were used to manufacture laboratory specimens, compacted with a gyratory compactor. Subsequently, a laboratory programme was established to analyse CRBM mechanical properties and, therefore, understand the material’s behaviour and performance under cyclic loading. Therefore, this practise should be analysed to decide if it is correct or if it can be improved. It was also found that the current design methodology for using CRBM in airfields is to conservatively equate material properties to those of a HMA commonly used in airfield base course (HDM50). The objective was to gain sufficient knowledge on key areas to conduct the research.īased on this literature review it was decided to use foamed bitumen as the cold technology and Kenlayer as pavement analytical design software.
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To achieve the project aims and objectives, a literature review was carried out focusing on pavement engineering, airfield pavement design and CRBM. For this purpose, the objectives were to review past experience on performance of these materials, measure and analyse the effect of key variables on performance to establish material limitations and develop a design methodology, proposing design guidance for airport authorities and practitioners. The aim of this investigation is to develop a design methodology to use CRBMs in airfield pavements. This is the reason why this Thesis focuses on airfield pavement design with CRBM. However, despite the increasingly common use of CRBM in roads, the specifications for the use of these materials in airfields are under-developed and there is no guidance to ensure that pavement design with these materials is trustworthy. In this sense, using cold recycled bound materials (CRBMs) becomes the most economic and sustainable option. The reduction in energy consumption is largely achieved by avoiding aggregate drying and mixing of the material at ambient temperature. Recycling these pavements into unbound materials is also prohibited consequently, disposal or cold recycling are the two available options.Ĭold recycling of asphalt is a proven technique that reduces material disposal and raw material and energy consumption. However, UK pavements constructed prior to 1980 or surfaced in the late 1980’s may contain tar, a carcinogenic substance that cannot be reheated and, therefore, cannot be recycled into hot mix asphalt (HMA).
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This reduces the use of new bitumen and aggregates and avoids disposal. Using Reclaimed asphalt pavement (RAP) is a rehabilitation technique which involves recycling materials from asphalt layers that have already been in service. The aim is to minimise the waste generated and maximise quantities of materials reused or recycled, minimising raw material consumption. The UK has adopted the concept of sustainable development and the construction industry is playing a key role in improving the efficient use of materials.
#Kenlayer pavement design software pdf#
Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Airfield pavement design with cold recycled materials.