Temperature Influence on Rheology of Superplasticized Pozzolana Cement and Modeling Using RKS Algorithm
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 9
Abstract
Rheology deals with flow and deformation of matter under applied force. The study of rheological response of superplasticized portland pozzolana cement pastes subjected to a stepwise loading at three levels of temperature using Herschel–Bulkley and Bingham flow models is presented here. Rheological tests were done in a temperature-controlled coaxial cylinder viscometer (Brookfield DV-II). Cement pastes were prepared at a water–cement ratio of 0.37 using four types of portland pozzolana cement (PPC) and superplasticizers (SP) of four different families. Saturation dosages of the superplasticizers were obtained through Marsh cone and mini slump tests. Rheological tests were done on superplasticized cement paste mixes for three levels of dosages viz., lower than the saturation dosage, saturation dosage, and higher than the saturation dosage. Cement paste samples were subjected to shear rates ranging from to in the viscometer and the resultant shear stress was measured. Rheological parameters were obtained at three test temperatures (15, 27, and 35°C) by fitting the second cycle downward flow curves using Bingham model and Herschel–Bulkley model. These parameters were analyzed and used for modeling through random kitchen sink algorithm. The variation of predicted and measured values of the rheological parameters were compared and validated. It was observed that the model could effectively predict the rheological parameters within the experimental domain.
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Journal of Materials in Civil Engineering
Volume 30 • Issue 9 • September 2018
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©2018 American Society of Civil Engineers.
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Received: Jun 19, 2017
Accepted: Feb 28, 2018
Published online: Jun 30, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 30, 2018
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