Testing of Cementitious Materials Using a Dynamic MEMS Micro Rheometer
Yong Sik Kim, Nicholas G. Dagalakis, Chiara C. Ferraris, Nicos Martys
Incompatibility of cementitious materials with admixtures often requires time consuming testing. Usually, several mixtures need to be prepared either using concrete or paste to determine the optimum high range water reducer dosage (HRWRA) and type. The number of tests increases if the dosages of supplementary cementitious materials (SCMs) are also optimized. To help reduce testing time and amount of materials used, a high through-put micro rheometer is being designed that is based on an oscillatory parallel plate type rheometer. This novel device is a planar single-Degree of Freedom (DOF) motion stage based on Micro Electro Mechanical Systems (MEMS) fabrication methods. To meet the requirements for application to cement based materials, a single-DOF motion stage is driven by an electro-thermal actuator that is designed to provide a shear stress of up to 60 Pa. The device is small and inexpensive to manufacture and several of them can be used in parallel to test several mixtures of paste at the same time. A vision sensor recognizes a set of predetermined patterns embedded on the motion stages for monitoring their motions. Data were, obtained on a prototype, by measuring the rheological properties of Bentonite.
Proceedings of the 8th International RILEM Symposium in Self-Compacting Concrete- PRO100, ed.
, Dagalakis, N.
, Ferraris, C.
and Martys, N.
Testing of Cementitious Materials Using a Dynamic MEMS Micro Rheometer, Proceedings of the 8th International RILEM Symposium in Self-Compacting Concrete- PRO100, ed., Washington, DC, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919900
(Accessed August 12, 2022)