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Shotcrete Corner of proper shotcrete equipment setup (pump/gun, delivery hose, construction team (qualified contractor, ACI Certified Noz- nozzle, air/water supply). When shooting, the assistant noz- zleman, and experienced crew) have proven their knowledge zleman/nozzleman trainee must be under the direction of an and ability to consistently place quality concrete. It is highly ACI Certified Nozzleman. recommended that the owner or specifier consider pre-qual- Blowpipe/Air Lance Control—This person should have ifying shotcrete contractors using these guidelines prior to experience in finishing shotcrete and have proven successful bid, or at a minimum have the information submitted with manipulation of the blowpipe on previous jobs as directed by an the bid. ACI Certified Nozzleman, shotcrete foreman, or superintendent. 1. Five years of experience as a licensed contractor. Wireman—The wireman should have at least 1 year of exper- 2. Five shotcrete projects of similar size, scope, and shotcrete ience in setting grades on projects with shotcrete applications. process used (dry- or wet-mix) successfully completed in Rodman and Finisher—The rodman and finisher must those 5 years with proper documentation, including full have shotcrete experience and care must be taken not to create contact information for owner/engineer/construction man- sags and loss of bond. Previous work experience that provided ager/general contractor, a project description, and the scope acceptable results should qualify them in this position. of work accomplished. Gunman or Pump Operator—The gunman or pump 3. The ability to self-perform all shotcrete-related work and operator should be familiar with and be able to operate the a minimum crew on hand and/or staff listed as part of the shotcrete delivery equipment, know the proper methods of company (either employees or substitutes with a work his- material preparation and mixing, and be familiar with the tory under current business name) consisting of the fol- chosen method of communication. The pump operator and lowing minimum experienced field crew members: gunman should preferably have at least 1 year of experience a. Shotcrete Foreman operating the intended equipment and be familiar with all b. Nozzleman (at least one ACI Certified Nozzleman on manufacturers’ safety guides and operations. the project) Mixerman—The mixerman should know and perform the c. Dry-Mix Gunman or Wet-Mix Pump Operator proper methods of material preparation and mixing to consis- d. Assistant Nozzlemen/Nozzlemen Trainees (blowpipe/ tently mix and maintain the required mixture proportions, air-lance controller) including the proper water-cementitious material ratio (w/cm). e. Finishers The mixerman should have a minimum of 6 months running f. Mixerman the specific (or similar) mixing equipment used on the project. g. Hose Tenders Project Engineer, Project Manager, or Superintendent— 4. Ownership of all necessary shotcrete-specific equipment The project engineer, project manager, or superintendent should (pumps, guns, and hoses) to accomplish the job based on have at least 3 years of relevant field experience. the specific project needs. Shotcrete contractor must submit sizes and models for all shotcrete equipment to be used, Shotcrete Contractor Qualifications including full equipment backup in case of equipment The uniquely different needs of the shotcrete field crew and breakdown. equipment, when compared to that for conventional cast-in- 5. A certificate as a Business in Good Standing from the state place concrete work, require the support, commitment, and that the company resides in. positive attitude of the entire contracting organization for suc- 6. A letter of bonding capacity from the bonding company or cessful execution of quality shotcrete projects. Successful a letter of credit. shotcrete projects demand full corporate support in: 7. Company insurance in good standing, meeting all state 1. Establishing and enforcing safety and quality-control policies; minimum requirements, including, but not limited to, gen- 2. Purchasing and maintaining the proper equipment for each eral liability and workers’ compensation. project’s particular needs; 8. ASA Corporate Membership 3. Committing to hire, train, and maintain the needed field 9. Ability to demonstrate that company construction support personnel; staff (safety, general superintendent, project managers, and 4. Handling the logistics of bidding, scheduling, and precon- construction managers) has educational session credits struction requirements in a timely and efficient manner; and through an industry-appropriate continuing education 5. Maintaining good client relationships, without which the program specifically addressing shotcrete design, construc- shotcrete project may be less than successful. tion, or administration (ACI certifications; ASA education The owner or specifier should always require an experi- sessions including ASA Onsite Seminars; seminars; or enced and qualified shotcrete contractor team for executing trade shows, such as World of Concrete, ACI conventions, quality shotcrete work. With this in mind, ASA has estab- and ASA meetings). lished the following guidelines for an owner or specifier to 10. An office, shop, or business base (with an address). consider when selecting a shotcrete contractor qualified to 11. References (including those from the five projects in undertake a project. Following these recommendations give Item #2). the owner or specifier assurance that the entire shotcrete 12. Affiliations 54 Shotcrete • Winter 2014


2014WinShotcreteEMag
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