Recent developments in reactivity testing of supplementary cementitious materials

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1 Scopus citations


Identification and rapid characterization of novel supplementary cementitious materials (SCMs) is a critical need, driven by shortfalls in conventional SCMs. In this study, we present a discussion of recently developed reactivity tests – the R3 test, the modified R3 test, the lime strength test, and the bulk resistivity index test. These tests measure reactivity parameters such as heat release, bound water, calcium hydroxide consumption, strength, and bulk resistivity. All tests can screen inert from reactive materials. To additionally differentiate pozzolanic and latent hydraulic materials, two parameters, for example, calcium hydroxide consumption and heat release, are typically needed. The influences of SCM bulk chemistry, amorphous content, and fineness on measured reactivity are outlined. Reactivity test outputs can predict strength and durability of cement paste/mortar/concrete; however, caution must be exercised as these properties are influenced by a variety of other factors independent of reactivity. Thoughts are provided on using reactivity tests to screen materials for concrete durability.

Original languageEnglish (US)
Pages (from-to)131-139
Number of pages9
JournalRILEM Technical Letters
StatePublished - Mar 15 2021
Externally publishedYes


  • Bulk resistivity
  • Calcium hydroxide
  • Durability
  • Heat release
  • Reactivity
  • Supplementary cementitious materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)


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