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GeneralMatching Equipment to Process: The Predampener

David Jamieson

As one who promotes choosing process before product, I believe that the success of any project also depends on matching the appropriate equipment to the process/product chosen. Specialty equipment offers several opportunities to achieve effective results. This article will discuss the predampener, a machine used

GeneralACI Shotcrete Certification: Our Aim is True

John W. Nehasil

GeneralPump Safety – The Forgotten Screen

Chris Zynda

It seems like every time we take delivery of a new pump, everybody wants to climb all over it. They love to check out all controls and features, comparing them to the equipment they have been using.

GeneralShotcrete Construction Joints

Dr. Rusty Morgan

Shotcrete construction joints are required in situations such as the following. When the volume of shotcrete is greater than that which can be conveniently applied and finished in a single shift. In the construction of top-down shotcrete installations, such as soil-nailed walls, where the element

GeneralShotcrete Pump

Chris Zynda

The 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

Wet-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

Basically, 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

Construction 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 sufficient levels of noise to cause hearing loss when a

GeneralACI Shotcrete Nozzleman Certification and the American Shotcrete Association

Jean-Francois Dufour

As 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

Rebound is an essential element in the application of shotcrete. Rebound is defined 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