GeneralShotcrete Pump
Chris Zynda
Read MoreThe shotcrete pump. Every shotcrete crew needs one. Unfor-tunately, the pump that pushes all the material we need to do our job gets more abuse than any of the other equipment. Pumps come in various sizes and shapes, anywhere from a trailer single axle to
GeneralWhat You need to know about Wet-Mix Shotcrete
Ray Schallom and Mike Ballou
Read MoreWet-mix shotcrete is a mixture of cement, aggregates, and water that may contain admixtures, which is hydraulicallypumped to the nozzle where compressed air is added to provide high velocity for placement and consolidation of the material on the receiving surface. The purpose of this article
GeneralDry-Mix Guns
Pietro Teichert
Read MoreBasically, three different types of shotcrete guns exist for the dry-mix process, all of which work on the suspension-conveying principle. Used occasionally today, was invented by Carl E. Akeley in 1907.1 It employs two connected chambers arranged one above the other, with the discharge outlet
GeneralHear, Here…
Thomas H. Adams
Read MoreConstruction sites can be very noisy places”kind of like a Rolling Stones concert, but much longer in duration. A lot of the equipment we use on a regular basis in the construction industry can produce sufï¬cient levels of noise to cause hearing loss when a
GeneralACI Shotcrete Nozzleman Certification and the American Shotcrete Association
Jean-Francois Dufour
Read MoreAs a member of the American Shotcrete Association (ASA) since its inception, and as a member of the shotcrete industry for even longer, I have been an active participant in the debate over the importance of shotcrete nozzleman certification. For years, very few throughout the
GeneralShotcrete Rebound- How Much is Enough?
Michael Ballou
Read MoreRebound is an essential element in the application of shotcrete. Rebound is deï¬ned as follows: œMainly large aggregate with some sand and cement that bounces or ricochets off the receiving surface and falls on to lower surfaces.1 There is a vital function that is achieved
GeneralUnderstanding Wet-Mix Shotcrete: Mix Design, Specifications, and Placement
Denis Beaupre, Marc Jolin
Read MoreThe purpose of this article is to examine the use of modern wet-mix shotcrete in underground environments. A critical review is provided of aspects such as mixture design, specifications, and placement. More specifically, the intent of this article is to identify the limits of the
GeneralDesign Globally, Proportion Locally
Kevin A. MacDonald, PhD, PE, and Mark Lukkarila
Read MoreThe purpose of this article is to examine the use of modern wet-mix shotcrete in under-ground environments. A critical review is provided of aspects such as mixture design, specificcations, and placement. More specifically, the intent of this article is to identify the limits of the
GeneralHow to Plan Your Safety Training Program
Thomas H. Adams
Read MoreThe subject of safety training necessarily starts with the question, œWhat do we need? A training-to answer this question. These answers will begin to deï¬ne the content, frequency, categories of employees to be trained, and documentation required. Some training is required by law. Federal, state,
GeneralUpdate on Standards for Shotcrete
Peter C. Tatnall
Read MoreThere have been a number of articles on shotcrete speciï¬cations or guidelines since Shotcrete™s debut issue in 1999.1-5 Because this issue™s theme is Specitcations, I thought it timely to offer an article updating the state of current standards in North America and the ongoing work