The Effect of Shear Rate on Rheological Properties of Cement Paste

Author(s): Dimitri Feys, Azadeh Asghari, Aida Margarita Ley Hernandez
Paper category: Proceedings
Book title: International RILEM Workshop on Rheological Measurements of Cement-based Materials IRWRMC’18
Editor(s): Chafika DJELAL, Yannick VANHOVE
Print-ISBN: 978-2-35158-230-5
e-ISBN: 978-2-35158-231-2
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 53 - 57
Total Pages: 5
Language: English

Abstract: Cement-based materials are complex suspensions and substantial care should be taken when executing rheological measurements. Due to thixotropic behavior, whether this is caused by flocculation or hydration, no uniform flow curve exists, but the rheological properties depend on the imposed reference state. This paper explores the theory that imposing a higher shear rate on a cement paste sample, after a rest period, causes more breakdown of internal structure and results in lower rheological properties. This theory seems valid for concentrated, well-dispersed cement pastes, but at higher w/c and lower dispersion degree, some rebuild is observed when increasing the shear rate. Modifying the temperature leads to a change in build-up in a certain time frame, in terms of the number and strength of the connections, which is reflected in the results.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00