GeneralASA Developing Dust
William Clements and Cody Fournier
Read MoreAlthough dry-mix shotcrete has been used extensively in both mining, tunneling and concrete repair projects, it suffers from the reputation that it will produce more dust than other repair methods or even wet-mix shotcrete. Due to the fact that dry-mix shotcrete is most often applied
GeneralShotcrete Systems
Brian Lywandowsky
Read MoreMy name is Brian Lywandowsky and I work for a large concrete construction company in the San Francisco Bay Area. I’ve worked in the concrete pumping business since I was sixteen. Since then, I have owned a small pumping business with my father and in
RepairArchitecturalUndergroundStructuralGeneralShotcrete Incorporated into ACI 318-19 Building Code
Charles Hanskat, Terence C. Holland, and Bruce A. Suprenant
Read MoreSince the shotcrete process originated well over 100 years ago, improvements in materials, equipment, and placement techniques have enabled it to become a well-proven method for structural concrete placement. The efficiency and flexibility of shotcrete have been used to great advantage in sizable structural projects, as
UndergroundGeneralPerformance of Synthetic Sheet Waterproofing Membranes Sprayed with Steel Fiber-Reinforced Shotcrete
Antoine Gagnon, Marc Jolin, and Jean-Daniel Lemay
Read MoreThe recent Position Statement #2, “Spraying Shotcrete on Synthetic Sheet Waterproofing Membranes,” published by the ASA Underground Committee, pointed out many aspects critical to successful performance and raised some potential issues affecting the placement.1 In the position statement, specific techniques are presented to prevent problems
UndergroundGeneralFiber-Reinforced Shotcrete Applications and Testing Overview
Antoine Gagnon and William (Bill) Geers
Read MoreThe addition of fibers to concrete and mortars as reinforcement is not a new concept. The ancient Egyptians used straw to reinforce mud bricks for use in structures like the core walls of the pyramids. During the first century AD, the Romans incorporated horsehair fibers
GeneralThe Newly Launched ACI Shotcrete Inspector Certification Program
Randle Emmrich, Charles Hanskat, and Marc Jolin
Read MoreThe Shotcrete Inspector Certification program began out of the need in the industry to have knowledgeable individuals inspecting shotcrete projects. Shotcrete contractors often find themselves having to educate project inspectors on the details needed for quality shotcrete placement. Shotcrete is a superior placement option in
GeneralImproving Shotcrete Inspections
Mark Bradford
Read MoreShotcrete is a placement method for concrete. Even though the shotcrete process is over 100 years old, it constantly evolves and today, it is a modern, costeffective, and more sustainable method of concrete placement. Those of us who regularly shotcrete a variety of work will
GeneralCommon Test Panel Mistakes
Dennis Bittner
Read MoreFrequently, shotcrete contractors are required to shoot test panels at the beginning as well as throughout projects. Several tests are performed from these panels; however, compressive strength testing is the most common. This article will primarily address compressive strength testing. At some point, every contractor
GeneralUnderstanding What Can Cause Problems with Concrete and Shotcrete – Part 1
Raul Bracamontes
Read MoreThis is Part One of a two-part series on potential causes of problems in concrete and shotcrete.
SafetyGeneralWhen Cement Turns Against You
Jason Myers
Read MoreCement is at the center of our industry. A common safety issue and hazard with it is cement burns.