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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: Rheological Behavior of Dry-Mix Shotcrete
Author(s): A. D. Figueiredo
Publication: Special Publication
Appears on pages(s): 113-128
Keywords: compaction; dry-mix shotcrete; rebound; rheology; strength
Abstract:In this study three series of four test panels were molded varying the mortar content. In the three series, the dry-mix shooting process were regulated with three different conditions. In each test panel samples and cores were taken to determine shotcrete mix proportions and physical properties. The results show a good correlation between stiffness and W/C in according with the exponential model proposed by Powers, confirming the Proctor needle as a good instrument to dry-mix shotcrete workability control. The compaction and compressive strength were as high as the volume of paste incorporated in the shotcrete. This feature provides a typical dry rheological behavior to the fry-mix shotcrete, where the Abram's Law is not valid. It occurs regardless of the fine and coarse aggregates proportion, although the influence of which on rebound is very clear. It is recommended that one should not fix a maximum W/C for a given compressive strength in the dry-mix shotcrete specifications. On the contrary, the consistency measurement by the Proctor needle, appears to be a good instrument for dry-mix shotcrete workability control. The use of the aggregates gradation recommended by the Aci is a good way to achieve better shotcreting conditions with a minimum rebound.
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