NDLI: Inconsistencies in the pozzolanic strength activity index (SAI) for silica fume according to EN and ASTM

Content Provider	Springer Nature Link
Author	Thorstensen, Rein Terje Fidjestol, Per
Copyright Year	2014
Abstract	New supplementary cementitious materials claimed to possess pozzolan properties emerge frequently. This development is driven both by economic and environmental pressures. Properties of new materials are compared with those of materials already well known, such as silica fume. Several test methods are standardized for making such comparisons, regulated by both European (EN) and American (ASTM) standards. Standardization indicates that procedures are secured to make comparisons valid and informative. In this article the sensitivity of accepted variations within each of the standard procedures are investigated to determine if the results are influenced by such variations. Various methods for testing pozzolanic properties are briefly discussed. Experimental work was carried out in compliance with the standard methods for testing silica fume, according to both EN and ASTM. Seventy two mixes are made and tested in the experimental series, combining two standard procedures, two types of sand, three cements and four flow agents (SP). The results show that determined values are highly influenced by variations accepted to be made within the standard procedures. Possible reasons for these variations are analyzed. Conclusions are made that even when complying with the standards, the results are heavily manipulable (intended or unintended). Also a shortcoming in EN regarding new materials, is detected. Suggestions are made on additional information required to be given together with the results when reporting pozzolanic properties according to standards in order to make results informative and reproducible. A limitation in EN towards testing nano-sized silica materials is detected. An adjustment is suggested, to make EN applicable correspondingly to ASTM, also for these materials.
Starting Page	3979
Ending Page	3990
Page Count	12
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	48
Issue Number	12
e-ISSN	18716873
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-11-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pozzolan Supplementary cementitious materials (SCM) Standard (EN13263 and ASTM C1240) Strength activity index (SAI) Microsilica Nano-sized silica Structural Mechanics Materials Science Theoretical and Applied Mechanics Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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