The Development of Accelerated Test Method for Internal Sulfate Attack by Delayed Ettringite Formation

Van Huong Nguyen; Nordine Leklou; Pierre Mounanga

doi:10.4028/www.scientific.net/MSF.987.27

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HomeMaterials Science ForumMaterials Science Forum Vol. 987The Development of Accelerated Test Method for...

The Development of Accelerated Test Method for Internal Sulfate Attack by Delayed Ettringite Formation

Abstract:

Delayed Ettringite Formation (DEF) is an internal sulfate attack caused by heat-induced decomposition and/or prevention of normal ettringite formed during the initial hydration of cement at elevated temperature (above about 70°C) and its re-crystallization in the hardened matrix. This reaction is a physico-chemical phenomenon inducing an expansion of the cement paste that could lead to cracking of cementitious matrix. These cracks result in a decrease in the mechanical performances and durability parameters of the material. However, the internal sulfate attack is characterized by a very slow reaction kinetics and therefore it is difficult to study it in laboratories. This research developed an accelerated method focused on mortar specimens; it is based on electrochemical techniques in order to speed the leaching of alkalis that could be accelerated the DEF.

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Materials Science Forum (Volume 987)

Pages:

27-32

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.987.27

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Online since:

April 2020

Authors:

Van Huong Nguyen*, Nordine Leklou, Pierre Mounanga

Keywords:

Accelerated Method, Alkaline Leaching, DEF, Expansion, Heat Curing, Mortar

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