American Journal of Civil Engineering and Architecture
ISSN (Print): 2328-398X ISSN (Online): 2328-3998 Website: http://www.sciepub.com/journal/ajcea Editor-in-chief: Mohammad Arif Kamal
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American Journal of Civil Engineering and Architecture. 2016, 4(4), 125-132
DOI: 10.12691/ajcea-4-4-3
Open AccessArticle

Estimation of the Yield Stress of Cement Pastes from Electrical Resistivity Measurement

Mbujje Joel Webster1, , Wei XiaoSheng1 and Makorogo Javilla Barugahare2

1School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 430074, Wuhan, China

2State Key Laboratory of Silicate, Wuhan University of Technology, 430070, Wuhan, China

Pub. Date: June 29, 2016

Cite this paper:
Mbujje Joel Webster, Wei XiaoSheng and Makorogo Javilla Barugahare. Estimation of the Yield Stress of Cement Pastes from Electrical Resistivity Measurement. American Journal of Civil Engineering and Architecture. 2016; 4(4):125-132. doi: 10.12691/ajcea-4-4-3

Abstract

This study proposes a continuous method for predicting the yield stress development from mixing until the final setting point. Samples prepared with water to cement ratios (w/c) of 0.3, 0.35 and 0.4 are tested using a vane in cup rheometer, a Vicat needle and a non contact electrical resistivity machine (NC-ERM). Times corresponding to the initial yield stress (ta), a dramatic increase in the yield stress (tb), a maximum torque reading on the rheometer (tc), an initial setting (td) and a final setting (te) on the yield stress-time (τ(t)-t) curve are correlated with the time at a point of inflexion (tP) on the bulk resistivity-time (ρ(t)-t) curve. A quantitative relationship developed between the yield stress and electrical resistivity shows a good agreement with experimental data.

Keywords:
electrical resistivity yield stress cement paste water to binder ratio

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