Report of RILEM TC 267-TRM phase 2: optimization and testing of the robustness of the R3 reactivity tests for supplementary cementitious materials

The results of phase 1 of an interlaboratory test, coordinated by the RILEM TC 267-TRM "Tests for Reactivity of Supplementary Cementitious Materials" showed that the R-3 (rapid, relevant, reliable) test method, by measurement of heat release or bound water, provided the most reliable and relevant determination of the chemical reactivity of supplementary cementitious materials (SCMs), compared to other test methods. The phase 2 work, described in this paper aimed to improve the robustness of the test procedure and to develop precision statements for the consolidated test procedure. The effect of the pre-mixing and mixing conditions, and the impact of the mix design on the test method robustness were assessed and fixed for optimal conditions to carry out the R-3 heat release test. The effect of the drying step was evaluated to define the R-3 bound water test procedure in more detail. Finally, the robustness of the consolidated final test methods was determined by an interlaboratory study to define the precision statements.

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François Henri Avet, Mohsen Ben Haha, Shashank Bishnoi, Pawel Tadeusz Durdzinski, Xuerun Li, Diana Londoño Zuluaga, Anuj Parashar, Karen Scrivener, Ruben Anton Snellings
SPRINGER, 2022
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https://infoscience.epfl.ch/record/293414?ln=fr

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Test (méthode)

Un test est une méthode de travail dans de nombreux domaines, tant en sciences exactes qu'en sciences humaines. Définition Il consiste en un essai d'actions ou d'interaction pour apprend

Papier

Le papier est un matériau en feuilles minces fabriqué à partir de fibres végétales. C'est un support d'écriture et de dessin avec de nombreuses autres applications. On appelle carton un papier épais

Reactivity (chemistry)

In chemistry, reactivity is the impulse for which a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy. Reactivity refers

Rapid, Robust, and Relevant (R3) Reactivity Test for Supplementary Cementitious Materials

François Henri Avet, Xuerun Li, Karen Scrivener, Ruben Anton Snellings

Although supplementary cementitious materials (SCMs) are now commonly accepted and widely used, consensus has not been reached for methods to test their chemical reactivity. A multitude of test methods exist but often fall short on one or more of the key features of a proper test-that is, width of scope, practicability, reproducibility, and relevance of the result. A rapid, robust, and relevant chemical reactivity test applicable to a wide range of SCMs would therefore not only serve as global benchmark but it would also remove present ambiguities in regards to classification. In response, a new, so-called "R3" test was conceived at Ecole Polytechnique Federale de Lausanne and is now being further developed and tested in RILEM TC 267 TRM, The test method was initially based on a screening of calcined clays in portlanditealkali-sulfate systems by isothermal calorimetry. Subsequently, the system formulation was more systematically studied and compared to strength development of blended cement mortar bars for a wide range of calcined kaolinitic clays. Remarkably good correlations between strength development and heat release were found. This was confirmed for other Sells and other measurable system properties. In particular; bound water content and chemical shrinkage correlated remarkably well to the isothermal calorimetry results. The origin of this correspondence can be traced back to the hydration reaction. Indeed, it is the solidification of water that directly links heat release; chemical shrinkage; and, obviously, bound water content. This contribution traces back the origins and the first inroads leading up to the present state of development of the test method and concludes on future perspectives.

AMER CONCRETE INST2019

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Report of RILEM TC 267-TRM phase 3: validation of the R-3 reactivity test across a wide range of materials

François Henri Avet, Mohsen Ben Haha, Pawel Tadeusz Durdzinski, Xuerun Li, Diana Londoño Zuluaga, Karen Scrivener, Ruben Anton Snellings

RILEM TC 267 TRM- "Tests for Reactivity of Supplementary Cementitious Materials" recommends the Rapid Reliable Relevant (R-3) test as a method for determining the chemical reactivity of supplementary cementitious materials (SCMs) in Portland cement blends. In this paper, the R-3 test was applied to 52 materials from a wide range of conventional and alternative SCMs with the aim to validate such test. An excellent correlation was found between the cumulative heat release and the bound water determined following the R-3 test method. Comparison of the R-3 test results to mortar compressive strength development showed that all conventional SCMs (e.g. blast furnace slag and fly ashes) followed the same trend, with the notable exception of very reactive calcined kaolinitic clays. It is discussed, through an in-depth statistical regression analysis of the R-3 reactivity test results and the 28 days relative compressive strengths, how reactivity threshold values for classification of the chemical reactivity of SCMs could be proposed based on the R-3 test results.

SPRINGER2022

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