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Simple Test Method to Assess the Relative Effectiveness of Plasticising Chemical Admixtures

Magee, Bryan and Alexander, Mark (2001) Simple Test Method to Assess the Relative Effectiveness of Plasticising Chemical Admixtures. Cement and Concrete Research, 31 (2). pp. 303-307. [Journal article]

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DOI: http://dx.doi.org/10.1016/S0008-8846(00)00448-8

Abstract

his paper proposes a simple test method capable of assessing the relative effectiveness of plasticising chemical admixtures. Using a hydrometer, the test measures the relative ability of different admixtures to disperse the individual particles of Portland cement (PC)/silica fume (SF) binder combinations. In a laboratory study carried out to examine the relative performance of three separate admixtures, the test clearly differentiated between PC/SF combinations containing no admixture, normal-range water-reducing admixtures, and high-range water-reducing admixtures. The two high-range water-reducing chemical admixtures considered showed identical dispersive effectiveness in the hydrometer test. This trend was mirrored in a concrete workability study, which indicated that equal dosages of each high-range water-reducing admixture were required to achieve 75-mm nominal slump for mixtures prepared using a range of SF dosages.

Item Type:Journal article
Keywords:Dispersion, Workability; Particle size distribution; Admixture; Silica fume
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Studies Allied to Built Environment Research (SABER)
ID Code:36906
Deposited By: Dr Bryan Magee
Deposited On:13 Feb 2017 11:27
Last Modified:13 Feb 2017 11:27

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