Economic assessment of use of pond ash in pavements

The paper introduces a new type of industrial waste-based subbase material which can replace conventional subbase material (CSM) in pavement construction. Utilisation of this industrial waste, namely pond coal ash produced from a thermal power plant in road construction will help to reduce the disposal problem of this waste and also will help to reduce the problem of scarcity of CSM. Lime and fibre were also added to the pond ash at various percentages to improve the suitability of this type of mix as subbase material. The optimum service life of pavement is studied with the help of numerical modelling and the cost benefit is also presented in the current study. The study reveals that stabilisation of the coal ash with 2% lime may produce an optimal material and, even though a greater thickness may be required to deliver the same pavement performance, direct cost savings of around 10% may be achieved in addition to less easily quantifiable environmental benefits. Design charts are provided to exploit the findings

Automating the Implementation of the Updated Grade Severity Rating System (GSRS) for Wyoming Mountain Passes

RS08220Truck crashes on steep downgrades caused by excessive brake heating is an ongoing concern for the Wyoming Department of Transportation (WYDOT). Crashes resulting from brake failure on downgrades cause a devastating toll on lives and property. To counter such crashes, WYDOT initiated a research project in 2016 to update a previous Grade Severity Rating System (GSRS) model originally developed in 1981. This was necessary due to the previous GSRS model being considered insufficiently representative of current truck characteristics, which have undergone significant changes over the decades. This study sought to fulfill Phase II of the GSRS study and was aimed at achieving three objectives. The first objective was to validate the GSRS model for trucks that have only drum brakes installed. The second objective was to make the updated GSRS fully implementable by incorporating horizontal curves into the formulation of the weight specific speed (WSS) signs. The final objective was to develop a software that simplifies the implementation of the GSRS and the formulation of WSS signs by generating maximum descent speeds for different weight categories as output

Evaluation of the ProRut system in Indiana.

Federal Highway Administration, Office of Implementation, McLean, Va.Mode of access: Internet.Author corporate affiliation: Indiana Department of Transportation, West LafayetteReport covers the period Sept 1987 - Sept 1989Subject code: CDFSubject code: NCXBSubject code: XQC