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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Flow Test: Particle-Level and Macroscale Analyses
Author(s): Hyun-Ki Kim, Douglas D. Cortes, and J. Carlos Santamarina
Publication: Materials Journal
Appears on pages(s): 323-327
Keywords: aggregate; flow; hydraulic cement; manufactured sand; rheology
Abstract:The physical interpretation of the flow test is investigated by conducting image-monitored flow tests on mortars prepared with mixtures of natural round sand and crushed angular sand to evaluate the progression of flow and the effect of aggregate shape characteristics on cement mortar rheology. The evolution of flow with the number of drops follows a hyperbolic trend. When analyzed within an energy-based framework, it is found that both the base shear at the mortar-plate interface and the internal energy loss in shear deformation are functions of the shear resistance within the mortar. This is further confirmed with mortars prepared with varying quantities of round particles. It is also shown that particle shape affects packing density and the mobilized friction between aggregates; therefore, particle shape defines the amount of paste required to reduce grain interaction to attain adequate flow.
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