Materials and Structures

, 51:27 | Cite as

Recommendation of RILEM TC 238-SCM: determination of the degree of reaction of siliceous fly ash and slag in hydrated cement paste by the selective dissolution method

  • Yury A. Villagrán-Zaccardi
  • Anya Vollpracht
  • Elke Gruyaert
  • Nele De Belie
Rilem Technical Committee


The performance of slag and fly ash in hydrated cementitious materials depends on the degree of reaction developed at the evaluated age. Several methods for the determination of the reaction degree of supplementary cementitious materials are available, among which the selective dissolution method is one of methods developed the earliest. This is a direct method that aims to quantify the amount of unreacted slag or fly ash in the sample by applying a selective acid attack. The degree of reaction is obtained from the comparison between the remaining unreacted SCM, which should not dissolve, and the total amount initially included in the mix. This recommendation indicates suitable procedures for computing the degree of reaction by selective dissolution of cement pastes containing slag and fly ash. Specific considerations are indicated for necessary corrections due to the imperfect selective dissolution when the procedure is applied to hydrated cement paste.


Degree of reaction Selective dissolution Acid attack Slag Fly ash Supplementary cementitious materials 



The authors wish to present their special thanks to Ruben Snellings and John Provis for their comments on the draft of this recommendation. The fruitful discussion held with other members in RILEM TC 238-SCM is also appreciated.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© RILEM 2018

Authors and Affiliations

  • Yury A. Villagrán-Zaccardi
    • 1
    • 3
  • Anya Vollpracht
    • 2
  • Elke Gruyaert
    • 1
  • Nele De Belie
    • 1
  1. 1.Magnel Laboratory for Concrete ResearchGhent UniversityGhentBelgium
  2. 2.Institute of Building Materials ResearchRWTH Aachen UniversityAachenGermany
  3. 3.LEMIT, CONICETLa PlataArgentina

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