Ultra-accelerated Method to Evaluate Recycled Concrete Aggregate in New Construction

The Rocky Mountain Region has experienced considerable difficulty due to the presence of alkali-silica reaction (ASR) in concrete construction. Several sources of aggregate that have produced poorly performing concrete have been removed from service. As an example, Denver International Airport (DIA) runways were damaged by ASR and the repair cost exceeded 30 million [1]. On a positive note, Wyoming Department of Transportation (WYDOT) was successful in using recycled concrete aggregate (RCA) on Interstate 1-80 and with limited ASR damage. In this portion of the road, WYDOT observed a 30 year service life. This performance, coupled with data from a previous study help confirm that using RCA combined with natural aggregates produces durable long-term concrete that will benefit the transportation network in this region. This study intends to provide experimental data that permits RCA to be used in applications beyond base fill for roads. Recent work funded by the Mountain-Plains Consortium and WYDOT indicate that mortar bar precision statements need relatively little change to incorporate RCA into the equation. Existing prism statements for within laboratory precision should be slightly relaxed and no change is required for interlaboratory precision. Unfortunately, this test method continues to eliminate aggregates that are only moderately reactive and does not consider the effects of coarse aggregate which is a critical player in alkali-silica reaction.

Language

  • English

Project

  • Status: Active
  • Funding: $182715
  • Contract Numbers:

    69A3551747108

  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Project Managers:

    Kline, Robin

  • Performing Organizations:

    University of Wyoming, Laramie

    1000 E University Avenue, Department 3295
    Laramie, WY  United States  82071
  • Principal Investigators:

    Tanner, Jennifer

  • Start Date: 20171102
  • Expected Completion Date: 20220731
  • Actual Completion Date: 0
  • Source Data: MPC-539

Subject/Index Terms

Filing Info

  • Accession Number: 01650578
  • Record Type: Research project
  • Source Agency: Mountain-Plains Consortium
  • Contract Numbers: 69A3551747108
  • Files: UTC, RiP
  • Created Date: Nov 6 2017 1:53PM