Title:
Large Amplitude Oscillatory Shear Protocol Applied to Cement-Based Materials
Author(s):
Théau Conte and Mohend Chaouche
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
42.1-42.18
Keywords:
Large Amplitude Oscillatory shear (LAOS), cement pastes, thixotropy, aging.
DOI:
10.14359/51701080
Date:
8/1/2017
Abstract:
Cement pastes exhibit virtually all the rheological features of complex fluids. Thus, several rheological methods and setups have been used in the literature to characterize these materials. In the present investigation Large Amplitude Oscillatory Shear (LAOS) is for the first time exploited for cement pastes. LAOS can be used to characterize all the rheological properties within a single procedure. This technique is tested in the case of three different cement mixes: a Portland cement paste, nanoclay
blended cement paste and a cement paste containing a hydro-soluble polymer. These mixes were selected in order to get rheological properties that are different both quantitatively and qualitatively. Indeed, addition of a low amount of nanoclay
increased significantly the yield stress and the shear-thinning/thixotropic aspects of the cement paste, whereas addition of cellulose ether led to the decrease of yield stress
and thixotropy. These non-linear rheological properties are discussed within the framework of LAOS.
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