Efficiency of calcined kaolin and silica fume as cement replacement material for strength performance
File(s)
Author(s)
Wong, H S
Abdul Razak, H
Type
Journal Article
Abstract
The concept of efficiency can be used for comparing the relative performance of various pozzolans when incorporated into concrete. In this paper, an alternative approach for the evaluation of efficiency factor k of a pozzolanic material has been introduced. The method, developed following Abrams strength-W/C ratio rule, calculates efficiency in terms of relative strength and cementitious materials content. The advantage of this method is that only two mixtures are required to determine the k factor of a specific mixture. A laboratory investigation on silica fume (SF) and metakaolin (MK) concrete found that the computed efficiency factors varied with pozzolan type, replacement level and age. At 28 days, the k values ranged from 1.6 to 2.3 for MK and 2.1 to 3.1 for SF mixtures, while at 180 days, the k values varied from 1.8 to 4.0 for MK and 2.4 to 3.3 for SF mixtures. Generally, the k factors increased with age but declined with higher pozzolanic content. It was also observed that change in W/CM ratio from 0.33 to 0.27 did not significantly affect the resultant efficiency factors. © 2004 Elsevier Ltd. All rights reserved.
Date Issued
2005
Citation
Cem Concr Res, 2005, 4, 35, pp.696-702
ISSN
0008-8846
Publisher
Elsevier Science
Start Page
696
End Page
702
Journal / Book Title
Cem Concr Res
Volume
35
Issue
4
Copyright Statement
© 2004 Elsevier Ltd. All rights reserved. NOTICE: this is the author’s version of a work that was accepted for publication in Cement and concrete research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Cement and concrete research, Vol. 35, Issue 4 (2005) DOI 10.1016/j.cemconres.2004.05.051
Description
4/11/14 meb. Accepted version, Ok to add.
Edition
4