You are an engineer working for an engineering consultancy who has been
commissioned by a transport authority to provide technical assistance related to the following highway and railway problems:
1. Highway maintenance, assessment, and methods (20%)
1 a). A site investigation was conducted on an existing highway pavement located in a subtropical temperature environment. Sections of the highway have experienced premature distresses such as that shown in Figure Q1.1. Overloading is a known problem in the area. Results of gradation tests conducted on samples taken within selected sections of the road revealed the particle size distribution shown in Table Q1.1 and average air voids of 2.5%. Falling Weight Deflectometer (FWD) deflection data indicated that the base can be considered marginal. Based on the given information, write a short report indicating what you think are the likely causes of the premature failure. Clearly describe your approach assuming the pavements were designed using
UK pavement mix design standards. Clearly state all your assumptions.
1 b). A section of the pavement was overlaid with 50 mm of asphalt concrete (AC) binder course and 40 mm of AC wearing course. The pavement developed rutting (average rut depth of 20 mm) during the first summer after construction. Which AC course has likely contributed to the development of rutting? What is the most suitable way to determine the layer causing the problem?
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