Characterization of Aggregates for Sustainable Freight Transportation Infrastructure

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Final Report

Primary Investigators

Hani Titi
University of Wisconsin — Milwaukee
PO Box 784, Milwaukee WI  53201
hanititi@uwm.edu

Abstract

Aggregates are significant components of roadway base courses, asphalt concrete pavements, Portland cement concrete pavements, and bridge/culvert structures. As such, quality of aggregates has a tremendous influence on the performance under heavy loads and durability of roadways and bridges.  Tests are performed to achieve aggregate characterization using the physical parameters of gradation, resistance to abrasion, and resistance to weathering (durability), which are considered conventional methods. The use of conventional methods such as the Sodium Sulfate Soundness Test (AASHTO T104) may not lead to accurate characterization of aggregate durability.  The current research will investigate aggregate durability using X-ray Computed Tomography (CT). This technology has emerged as a powerful, non-destructive scanning technique that can produce 3D rendering of the scanned object.  Comparisons will be made to relate the image produced parameters with conventional aggregate durability/strength methods.

Objectives

To investigate aggregate durability using a novel method, X-ray Computed Tomography (CT).

Tasks

  1. Assess the applicability of X-ray CT to characterize aggregate durability.
  2. Determine pore space size and distribution in various types of aggregates.
  3. Determine aggregate damage due to freeze-thaw cycles.
  4. Develop correlation between aggregate damage and properties
  5. Write working paper

Project Information

  • Duration: 9 months
  • Dates: September 1, 2011 – May 30, 2012
  • Budget: CFIRE: $40,000; Total: $78,000
  • Student Involvement: One graduate student
  • Modal Orientation: Highway
  • Project ID: CFIRE 05-07
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