skip to main content

Title: Modeling hydrology and reactive transport in roads: The effect of cracks, the edge, and contaminant properties

The goal of this research was to provide a tool for regulators to evaluate the groundwater contamination from the use of virgin and secondary materials in road construction. A finite element model, HYDRUS2D, was used to evaluate generic scenarios for secondary material use in base layers. Use of generic model results for particular applications was demonstrated through a steel slag example. The hydrology and reactive transport of contaminants were modeled in a two-dimensional cross section of a road. Model simulations showed that in an intact pavement, lateral velocities from the edge towards the centerline may transport contaminants in the base layer. The dominant transport mechanisms are advection closer to the edge and diffusion closer to the centerline. A shoulder joint in the pavement allows 0.03 to 0.45 m{sup 3}/day of infiltration per meter of joint length as a function of the base and subgrade hydrology and the rain intensity. Scenario simulations showed that salts in the base layer of pavements are depleted by 99% in the first 20 years, whereas the metals may not reach the groundwater in 20 years at any significant concentrations if the pavement is built on adsorbing soils.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Civil Engineering, University of Toledo, 2801 W. Bancroft St., Mail Stop 307, Toledo, OH 43606 (United States), E-mail: Defne.apul@utoledo.edu
  2. Environmental Research Group, Department of Civil Engineering, 35 Colovos Road, Durham, NH 03824 (United States), E-mail: Kevin.gardner@unh.edu
  3. Environmental Research Group, Department of Civil Engineering, 35 Colovos Road, Durham, NH 03824 (United States), E-mail: Taylor.eighmy@unh.edu
Publication Date:
OSTI Identifier:
21023859
Resource Type:
Journal Article
Resource Relation:
Journal Name: Waste Management; Journal Volume: 27; Journal Issue: 10; Conference: WASCON 2006: 6. international conference on the environmental and technical Implications of construction with alternative materials - Developments in the re-use of mineral waste, Belgrade (Serbia and Montenegro), 30 May - 2 Jun 2006; Other Information: DOI: 10.1016/j.wasman.2007.03.018; PII: S0956-053X(07)00118-3; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CRACKS; FINITE ELEMENT METHOD; GROUND WATER; HYDROLOGY; LAYERS; RAIN; SIMULATION; SOILS; STEELS