Alkali Silica Reactivity (ASR) Risk Assessment

Alkali-silica reaction (ASR) is a chemical reaction in either concrete or mortar between hydroxyl ions of the alkalis (sodium and potassium) from hydraulic cement (or other sources), and certain siliceous rocks and minerals, such as opal, chert, microcrystalline quartz, and acidic volcanic glass, present in some aggregates. This reaction and the development of the alkalisilica gel reaction product can, under certain circumstances, lead to abnormal expansion and cracking of the concrete. This phenomenon affects the durability performance of concrete structures severely. ASR is known as the “cancer” within the concrete and recognized as a major cause of concrete deterioration in the USA. Identifying the reactivity of an aggregate to ASR is one of the most efficient ways for preventing damage in practice. Many aggregates, especially the surface aggregates, used in Tennessee have a relatively high siliceous content (e.g. gravels, siliceous limestones, granites, and quartzite). Thus, the aggregates with ASR potential have the possibility to be used already in the past projects, and will be probably used even more in the future high volume transportation concrete projects due to the new requirements on the aggregates for riding surfaces in 2015 TDOT Standard Specifications. A statewide aggregate ASR risk database is required to provide a solid foundation for guaranteeing a good long-term performance and a high-level safety of statewide transportation concrete structures.

Project

  • Status: Active
  • Funding: $247,650.00
  • Contract Numbers:

    RES2016-03

    IG1858989

    IG1647797

  • Sponsor Organizations:

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  United States  37243-0349

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  United States  37243-0349
  • Project Managers:

    Purdy, Heather

  • Performing Organizations:

    University of Tennessee, Knoxville

    Knoxville, TN  United States 
  • Principal Investigators:

    Ma, Zhongguo

  • Start Date: 20151001
  • Expected Completion Date: 20210531
  • Actual Completion Date: 0
  • USDOT Program: Transportation, Planning, Research, and Development

Subject/Index Terms

Filing Info

  • Accession Number: 01708157
  • Record Type: Research project
  • Source Agency: Tennessee Department of Transportation
  • Contract Numbers: RES2016-03, IG1858989, IG1647797
  • Files: RiP
  • Created Date: Jun 20 2019 5:10PM