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2013FallShotcreteEMag

Shotcrete Classics Reprinted courtesy of Engineering News-Record, McGraw Hill Financial, November 9, 1933 Technical Editor’s Note: The following article is reprinted from Engineering News-Record, published November 9, 1933—80 years ago! Reading the article gives a fascinating glimpse of the past in our shotcrete industry, but surprisingly hits on many of the funda- mental aspects of shotcrete we still research today: nozzle material velocities, cement ratios and water content of mixtures, size and shape of test specimens, percentage of rebound, and air compressor size. Coincidently, in this issue of Shotcrete magazine, you’ll find an article detailing current research on nozzle material velocities and another article that details the use of ground recycled glass in shotcrete mixtures, which finds its use helps to reduce water demand. I must admit I also felt a bit of nostalgia seeing the picture of the “latest improved CEMENT GUN” at the end of the article. It looks almost exactly like the double-chamber gun I operated on dry-mix shotcrete jobs in the late 1970s. And although the manufacturer has changed names several times, the same basic gun is still available today! Enjoy this blast from the past! And here’s today’s model! (N-2 Gun, photo courtesy of Putzmeister Shotcrete Technology) Have an idea for an article topic? Send in your thoughts and comments for a Would you like to see an chance to be heard! issue addressed? info@shotcrete.org 66 Shotcrete • Summer 2006 • Fall 2013 Shotcrete


2013FallShotcreteEMag
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