Test methods and specifications

Cover of Alkali-Silica Reactivity of Aggregate – Accelerated Mortar Bar Test
Alkali-Silica Reactivity of Aggregate – Accelerated Mortar Bar Test
  • Publication no: AGBT-T701-20
  • Published: 20 January 2020

This Test Method determines the susceptibility of aggregate to an expansive reaction when mixed with cement in a concrete mix. It measures the change in length of representative mortar bars containing the aggregate under investigation during storage under prescribed test conditions.

This Test Method is not suitable for assessment for Alkali Carbonate Reactivity, which occurs less commonly than the Alkali Silica Reaction.

  • Commentary
  • 1. References
  • 2. Equipment
  • 3. Reagents
  • 4. Sample Preparation
    • 4.1 Sampling
    • 4.2 Preparation of Cement
    • 4.3 Preparation of Aggregate
      • 4.3.1 Naturally occurring fine aggregate (after processing)
      • 4.3.2 Coarse aggregate and fine aggregate produced from crushing
      • 4.3.3 Rock spalls, boulders or drill core
  • 5. Preparation of Mortar Bars
    • 5.1 Proportioning and Preparation of the Mortar
    • 5.2 Flow Measurement
  • 6. Procedure
  • 7. Equation
  • 8. Reference Testing
  • 9. Test Report
  • 10. Aggregate Reactivity Classification