Improving Guidance of AASHTO R 80/ASTM C 1778 for Alkali-Silica Reactivity (ASR) Potential and Mitigation

The realistic assessment of alkali-silica reactivity (ASR) and identification of preventive measures remain major challenges to the concrete and aggregate industry. The recently developed AASHTO R 80 Practice (previously AASHTO PP 65) and the American Society for Testing and Materials ASTM C 1778 Guide have significantly improved the way the concrete industry assesses aggregates for potential ASR and selects appropriate mitigation means to allow the use of potentially reactive aggregates in new concrete construction. These publications were a result of a number of FHWA- and state departments of transportation (DOTs)-sponsored studies on evaluating the potential for, and the prevention of, ASR as well as a consideration of the current approach by the Canadian Standards Association. The objectives of this research are to improve guidance in AASHTO R 80 and ASTM C 1778 through: (1) Constructing and evaluating field exposure blocks with varying concrete materials placed in diverse environmental conditions to supplement the existing information. (2) Enabling better benchmarking of current performance and job-mixture tests that have been or are being developed currently. To achieve the objectives of this research study, concrete blocks will be cast and exposed to a range of real highway environmental conditions, alkali loadings, and cement contents to provide the crucial long-term benchmarking for the developments of ASR test methods for job mixtures and to validate and/or calibrate the prescriptive measures in AASHTO R 80 and ASTM C 1778. The results from the exposure blocks cast in this research study are expected to improve current guidelines for assessing ASR in field concrete in real environmental conditions.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4564

Language

• English

Project

• Status: Active
• Funding: $650000
• Contract Numbers:

  Project 10-103

• Sponsor Organizations:

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Jawed, Inam

• Performing Organizations:

  University of Texas, Austin

  Center for Transportation Research, 3208 Red River Street
  Austin, TX  United States  78705
• Principal Investigators:

  Drimalas, Thano

• Start Date: 20190615
• Expected Completion Date: 20230630
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Accelerated tests; Alkali; Alkali aggregate reactions; Alkali silica reactions; Calibration; Cement content; Mix design; Pavement performance; Performance measurement; Test procedures; Validation
• Identifier Terms: American Association of State Highway and Transportation Officials; ASTM International
• Subject Areas: Construction; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01672254
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 10-103
• Files: TRB, RIP
• Created Date: Jun 19 2018 9:25AM