MATEC Web Conf.
Volume 274, 2019RICON17 - REMINE International Conference Valorization of Mining and other Mineral Wastes into Construction Materials by Alkali-Activation
|Number of page(s)||4|
|Section||Characterization of AAM, Such as Microstructure and Physical Properties|
|Published online||22 February 2019|
Testing Rheological Properties of Alkali-Activated Cement Using Non-Traditional Test Methods
Department of Civil and Environmental Engineering, Brunel University, London, United Kingdom
* Corresponding author: firstname.lastname@example.org
In this paper, the rheological parameters of alkaline activated cement (AAC) paste tailored for continuous extrusion using the non-traditional test method of the direct shear box test are presented. Characteristic changes of the material’s rheological behaviour are estimated in response to variations in the water-to-solid ratio and addition of a cellulosic rheology aid. The results indicate that the increase of the water-to-solid ratio from 0.18 to 0.19 does not impact the internal angle of friction (φ) but does, however, reduce the shear yield strength, or cohesion (c), by 85%. For mixes containing cellulosic rheology aid, the internal angle of friction shows no significant change also. However, the shear yield strength for the mix with a water-to-solid ratio of 0.18 is 51% higher. The shear yield strength increases by a further 28% for the mix with a water-to-solid ratio of 0.19. These results indicate that the cellulosic rheology aid does not necessarily increase the "flow-like" characteristics of the mix which provides it plasticity and the ability to move through the extruder. It does however significantly improve its ‘green strength’, even at an increased water-to-solid ratio of 0.19, which would ultimately assist with lowering the binder density.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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