Browsing by Author "Thyagarajan, Senthilmurugan"

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    Incorporating Traffic Speed Deflection Data in Pavement Management Decision Making for Flexible Pavements
    Thyagarajan, Senthilmurugan; Sivaneswaran, Nadarajah; Petros, Katherine (2015-06-04)
    Systematic pavement condition evaluation and development of an optimized set of pavement treatment strategies are two key tasks in the pavement management process that assists in making informed decisions on future construction actions. Current State Highway Agency's pavement management systems are primarily based on surface condition data, and surface cracking is mainly used as an indicator of the pavement structural condition. However, with effective pavement preservation activities that intervene early to preserve and extend the life of pavements and increasingly thicker long-life pavements, the surface cracks can no longer be a reliable indicator of structural condition of the pavement structure. This study envisions the use of data from Traffic Speed Deflection Devices (TSDD) in network level structural assessment and optimizing the pavement treatment strategies for flexible pavements within a modern pavement management framework. The methodology used the tensile strain at the bottom of the asphalt layer predicted from TSDD measurements to evaluate structural deterioration well before the occurrence of surface cracks, enabling more optimum treatment intervention. Mechanistic analyses were used to predict treatment benefits as a function of time and pavement condition at the time of application. The methodology allows the pavement engineer to identify an optimized series of treatment types and their timing over an analysis horizon that minimizes the life cycle cost while maintaining an above acceptable level of service. Finally the study illustrates the effectiveness of Remaining Service Interval (RSI) concept for consistent reporting of future construction needs based on optimum time remaining until a defined treatment type.
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    Investigation of Applicability and Use of a Pavement Response Model with High Speed Deflection Devices (HSDDs)
    Siddharthan, Rajaratnam V.; Nasimifar, Mahdi; Rada, Gonzalo R.; Nazarian, Soheil; Sivaneswaran, Nadarajah; Thyagarajan, Senthilmurugan (2014-09)
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    Pavement Remaining Service Interval: A Logical Replacement to Remaining Service Life Concept
    Sivaneswaran, Nadarajah; Visintine, Beth A.; Rada, Gonzalo R.; Elkins, Gary E.; Thyagarajan, Senthilmurugan (2015-06-04)
    The process of providing and managing a pavement network requires a plethora of decisions to be made. At the heart of those decisions is the prediction of future construction events, but many issues exist with the current remaining service life (RSL) terminology that confuse, confound, and complicate proper interpretation, interagency data exchange, and use. The major source of ambiguity with RSL is the use of the term "life" to represent different points in the construction time-line. There could be up to four different types of future construction events on which a RSL definition could be based, depending on the condition of the pavement, and it is impossible for a single number called RSL to properly describe all of these future construction events. The recommended path to consistency involves adopting terminology of time remaining until a defined construction treatment is required. RSL is replaced by "Remaining Service Interval" or "RSI" This terminology has the ability to unify the outcome of different approaches for determining needs by focusing on when and what treatments are needed, and the service interruption created. This paper explains the RSI concept and outlines the validation efforts using State Highway Agencies and the Pavement Health Track analysis tool at the national level. It also details how RSI can contribute to the requirements of the Moving Ahead for Progress in the 21st Century (MAP-21) legislation.