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Considerations for Design of Aggregate Gradation in Pavement Drainage Layers

Kalore, SA and Sivakumar Babu, GL and Mahajan, RR (2022) Considerations for Design of Aggregate Gradation in Pavement Drainage Layers. In: 4th International Conference on Transportation Geotechnics, ICTG 2021, 23-26 May 2021, Chicago, pp. 317-331.

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Official URL: https://doi.org/10.1007/978-3-030-77230-7_25


The key to the success of a drainage layer in pavements is the provision of moisture insensitive granular layer that has the optimum gradation to provide adequate drainage and stability. This study investigates the influence of aggregate gradation on drainage in terms of saturated hydraulic conductivity (Ks) and stability in terms of the void ratio. A new semi-analytical approach is presented to predict the Ks of granular soil based on the grain size distribution, porosity, and relative densities. The model is derived for estimating the Ks from the pore size distribution and porosity based on the Hagen�Poiseuille law. Based on the results obtained from published literature and laboratory testing, the model is validated, and model comparison demonstrates that the approach is an improvement over existing empirical and semi-empirical models. Further, simulations are performed for the optimized design of drainage layer aggregate gradations by varying coefficient of uniformity (Cu) and coefficient of curvature (Cc). The results demonstrate that the Cc significantly affects the Ks compared to the void ratio, which specifies a range of Cc for achieving optimum drainage and stability in the pavements drainage layer. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

Item Type: Conference Paper
Publication: Lecture Notes in Civil Engineering
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH
Keywords: Curve fitting; Grain size and shape; Hydraulic conductivity; Pavements; Pore size; Size distribution, Aggregate gradations; Coefficient of curvature; Grain size distribution; Laboratory testing; Saturated hydraulic conductivity; Semi-analytical approaches; Semiempirical models; Varying coefficients, Aggregates
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 03 Dec 2021 08:34
Last Modified: 03 Dec 2021 08:34
URI: http://eprints.iisc.ac.in/id/eprint/70234

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