The K-Value Concept Applied for GGBFS - Principles and Experiences

Title: The K-Value Concept Applied for GGBFS - Principles and Experiences
Author(s): R. Härdtl
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-110-0
e-ISBN: 978-2-35158-111-7
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 189 - 198
Total Pages: 10
Nb references: 11
Language: English

Abstract: The k-value concept is used in the European concrete standard EN 206-1 to define prescriptive application rules for fly ash (EN 450-1) and silica fume (EN 13263-1). Principle idea of the k-value is a generally valid and simple concept for the use of specified concrete additions satisfying the requirements on concrete performance (especially durability) without the need for an additional verification procedure.

Rules for the application of ggbfs according to the k-value concept shall be included in EN 206-1. So far systematic investigations on the k-value of ggbfs are very limited. The paper describes the principles of the k-value concept and the way k-values are calculated. It explains the basic approaches which are necessary to determine limits for k-values for standardization purposes as it has been realized for fly ash. Based on available results of concrete tests from different research programs k-values for ggbfs have been calculated taking into consideration different influencing parameters.

The results show that the k-value concept is also applicable for ggbfs. The size of determined k-values varies in a broad range. It strongly depends on the quality of the slag, its fineness, the interaction with cement (type, composition, strength class), the slag content, the w/c-ratio, and others. For a save concept in a prescriptive standard all these parameters have to be taken into consideration.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00