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Title: Effects of Particle-Size Distribution in Dry Process Shotcrete

Author(s): Marc Jolin and Denis Beaupre

Publication: Materials Journal

Volume: 101

Issue: 2

Appears on pages(s): 131-135

Keywords: consistency; dry-mix shotcrete; particle-size distribution; rebound.

Date: 3/1/2004

Dry-mix shotcrete has been used successfully for several years for construction and repair. Its unique pneumatic application yields an in-place material with low workability and relatively high stiffness particularly adapted to vertical and overhead applications without formwork. For some years, the reduction of rebound—particles not adhering to the surface during shooting—has received attention by many due to its important effects on costs and in-place properties. The intent of this project is to study the effects of the particle-size distribution of the granular phase in dry-mix shotcrete. The results presented confirm the validity of what is known as ACI Gradation No. 2 for shotcrete recommended by ACI Committee 506, Shotcreting. Moreover, a fundamental approach involving optimal packing density offers a simple and interesting explanation of the behavior observed and a basis for future related research.


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