Universitè Laval

Command Alkon, Inc.

Pierre Siccardi

Denis Beaupre

Marc Jolin

Antoine Gagnon

Thomas Jacob-Vaillancourt

A shotcrete nozzle assembly comprising: a tubular body including a body sidewall defining a central passageway extending along a central longitudinal passageway axis, and water dispensing bores extending through the body sidewall and including: first and second sets of water dispensing bores positioned such that outlet openings thereof defined in an inner face of the body sidewall are disposed in a respective one of longitudinally spaced-apart first and second transversal planes extending perpendicularly to the passageway axis, at least some of the water dispensing bores being oriented such that the central bore axes thereof extend in a non-radial direction relative to the passageway axis, and such that an orthogonal projection of the central bore axes of the first and second sets of water dispensing bores onto one of the transversal planes forms first and second projected central bore axes which intersect each other at a first non-zero angle.

Shotcrete nozzle assembly

There is described a system for determining air content of fresh concrete received in a drum of a concrete mixer. The system generally has a high energy photon source mounted to the drum and emitting high energy photons towards a photon path rotating about a rotation axis as the drum rotates, the photon path is immersed in the fresh concrete during rotation, a photon detector mounted to the drum, the photon detector counting high energy photons received from the photon path; and generating a signal indicative of a number of counted events; a computing device determining an air content value of the fresh concrete based on the generated signal and on reference data; comparing the determined air content value to an air content threshold; and generating an alert based on the comparison to be displayed.

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Pierre Siccardi