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ICAR Plus Rheometer

Purpose

ICAR Plus Rheometer is a rugged, portable instrument for measuring fundamental flow (rheological) properties of fresh concrete. The instrument was first developed at the International Center for Aggregate Research (ICAR) located at The University of Texas at Austin and then by Germann Instruments to fill the need for a method to characterize the true flow behavior of concrete mixtures. The traditional methods of measuring slump or slump flow are not capable of characterizing the fundamental rheological properties of concrete that exist during the processes of mixing, transporting, and placement. As a result, the true performance of innovative concrete mixtures cannot be measured with these traditional slump-based methods. The ICAR Plus Rheometer provides, for the first time, a low-cost and simple to operate instrument that can be used for:

·         Research and development to characterize the influence of new materials on concrete rheology

·         Optimizing mixture proportions so that the resulting concrete flows readily but is resistant to segregation (especially important for self-consolidating concrete)

·         On-site quality control

Principle

Fresh concrete can be considered as a fluid, which means that it will flow under the action of shear stresses. The flow behavior of concrete can be represented by the following two-parameter relationship: