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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, dissemination, and adoption of its 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: The Role of Surface Area and Compacity of Nanoparticles on the Rheology of Cement Paste 25.3
Author(s): Oscar A. Mendoza Reales, Emílio C. C. M. Silva, Maria D. M. Paiva, Pedro Duda, and Romildo Dias Toledo Filho
Publication: Special Publication
Appears on pages(s): 25.1-25.14
Keywords: nanoparticles; rheology; surface area; viscosity; yield stress
Abstract:Nanoparticles have a great influence on the rheology of cement matrices due to their inherent physical and chemical properties. This work quantifies the relation between matrix rheology and surface area of nanoparticles (carbon nanotubes, nanosilica and nanoclay), by comparing them with the effects of some equivalent microparticles (microsilica and metakaolin). Class G cement pastes blended with micro- or nanoparticles were prepared using a water-to-cementitious material ratio of 0.45 and a viscosity modifying agent to
prevent segregation and settlement. Static yield stress, dynamic yield stress, and plastic viscosity were determined to characterize the rheology. The first was measured directly, while the other two were obtained by fitting a Bingham model to the descending portion of a flow curve. It was found that micro- and nano- particle substitutions of similar composition and surface area have similar effects on the rheological parameters, indicating that the influence of nanoparticles is mainly governed by their specific surface area.
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