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Distinguishing dynamic and static yield stress of fresh cement mortars through thixotropy

Ye Qian; Shiho Kawashima

Title:
Distinguishing dynamic and static yield stress of fresh cement mortars through thixotropy
Author(s):
Qian, Ye
Kawashima, Shiho
Date:
Type:
Articles
Department(s):
Civil Engineering and Engineering Mechanics
Volume:
86
Persistent URL:
Book/Journal Title:
Cement and Concrete Composites
Abstract:
The dynamic and static yield stress of fresh cement mortar were measured in a rotational rheometer with a vane geometry using shear rate and shear stress-controlled protocols, respectively. Through a shear rate-controlled steady-state protocol, the equilibrium flow curve is measured and fitted with the Bingham model to obtain dynamic yield stress. A negative slope in the equilibrium flow curve, shear banding and stick-slip phenomena are observed and discussed. Through a stress-controlled creep-recovery protocol, viscosity bifurcation behavior is captured and static yield stress is marked as the creep stress when the bifurcation occurs. Finally, the discrepancy between dynamic and static yield stress is tied to thixotropy.
Subject(s):
Cement
Mortar
Strains and stresses--Measurement
Thixotropy
Publisher DOI:
https://doi.org/10.1016/j.cemconcomp.2017.11.019
Item views
28
Metadata:
text | xml
Suggested Citation:
Ye Qian, Shiho Kawashima, , Distinguishing dynamic and static yield stress of fresh cement mortars through thixotropy, Columbia University Academic Commons, .

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