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The effect of portland cements and superplasticisers on the rheology of cement paste
Author(s)
Mbasha Migabo, Willy
Date Issued
2015
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
Self-compacting concrete is very sensitive to variation in cement properties and to the interaction between cement paste and additives such as superplasticisers. The assessment of these interactions can be done rheologically but there is as yet no consensus on how to evaluate the rheological properties (yield stress and viscosity) of cementitious materials. In addition, there is no clear understanding of the dependency of these rheological properties on early hydration, evaluations which are recommended to be done at paste scale.
The evolution of rheological parameters in the early stage of hydration, of four CEM I 52.5N cements manufactured at different factories in South Africa, and their interaction with two different commercial superplasticisers (SPs) were investigated using three different rheometric techniques: conventional flow curve from hysteresis loops, amplitude sweep in oscillation mode and construction of flow curve.
Amplitude sweep, time sweep, viscosity-time sweep as well as thixotropy tests were conducted to investigate the effect of hydration and the rate of rebuilding of each cement in the presence and absence of SP. The experiments were done on a MCR51 rheometer with roughened parallel plates under controlled temperatures and relative humidity.
The evolution of rheological parameters in the early stage of hydration, of four CEM I 52.5N cements manufactured at different factories in South Africa, and their interaction with two different commercial superplasticisers (SPs) were investigated using three different rheometric techniques: conventional flow curve from hysteresis loops, amplitude sweep in oscillation mode and construction of flow curve.
Amplitude sweep, time sweep, viscosity-time sweep as well as thixotropy tests were conducted to investigate the effect of hydration and the rate of rebuilding of each cement in the presence and absence of SP. The experiments were done on a MCR51 rheometer with roughened parallel plates under controlled temperatures and relative humidity.
Additional information
Thesis (MTech (Civil Engineering))--Cape Peninsula University of Technology, 2015
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Name
212008188_Mbasha-Migabo_WM_MTech_Civil_Eng_2016.pdf
Description
Dissertation
Size
3.29 MB
Format
Adobe PDF
Checksum
(MD5):046c49e7673aca346b4dc6416a1e0c7c
Sponsor(s)
PPC Cement