Title:
Quality Control of Dry-Mix Shotcrete During Construction
Author(s):
Marc Jolin, Denis Beaupre, and Sidney Mindess
Publication:
Concrete International
Volume:
24
Issue:
10
Appears on pages(s):
69-74
Keywords:
DOI:
Date:
10/1/2002
Abstract:
This paper describes the development, the use and the benefits of an apparatus intended to measure the in-place consistency of dry process shotcrete. The effects of consistency on the in-place properties of fresh shotcrete (composition, rebound, viscosity) are presented. Depending on the shooting consistency, the amount of rebound can double for a given concrete mixture. In terms of the in-place composition, the consistency particularly affects the binder and large aggregate contents, which both have a significant influence on the cracking potential of shotcrete. These effects of the shooting consistency underline the importance of its evaluation on job sites. Some recommendations are presented regarding consistency and composition of the dry process shotcrete mixture. Finally, a simple method for on-site evaluation of consistency using a penetrometer is proposed.