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2013SumShotcreteEMag

content ratio (w/cm). The mixerman should have a. Shotcrete Foreman a minimum of 6 months running the specific (or b. Nozzleman (at least one ACI Certified similar) mixing equipment used on the project. Nozzleman on the project) Project Engineer, Project Manager, or Super- c. Dry-mix Gunman or Wet-Mix Pump intendent—The project engineer, project man- Operator ager, or superintendent should have at least 3 years d. Assistant Nozzlemen/Nozzlemen of relevant field experience. Trainees (blowpipe/air lance controller) e. Finishers Shotcrete Contractor f. Mixerman g. Hose Tenders Qualifications 4. Ownership of all necessary shotcrete equip- The uniquely different needs of the shotcrete field ment (pumps, guns, and hoses) to accomplish crew and equipment, when compared to that for the job based on the specific project needs. The conventional cast-in-place concrete work, require contractor must submit sizes and models of the support, commitment, and positive attitude of all shotcrete equipment to be used and should the entire contracting organization for successful have a full equipment backup in case of execution of quality shotcrete projects. Successful equipment breakdown. shotcrete projects demand full corporate support in: 5. A certificate as a Business in Good Standing 1. Establishing and enforcing safety and quality from the state that the company resides in. control policies. 6. A letter of bonding capacity from the bonding 2. Purchasing and maintaining the proper equip- company or a letter of credit. ment for each project’s particular needs. 7. Company insurance in good standing that 3. Committing to hire, train, and maintain the meets all state minimum requirements, needed field personnel. including, but not limited to, general liability 4. Handling the logistics of bidding, scheduling, and workers’ compensation. and preconstruction requirements in an 8. ASA Corporate Membership. efficient manner. 9. Ability to demonstrate that members of the 5. Maintaining good client relationships, without company construction support staff (for which the shotcrete project may be less than example, safety, general superintendent, successful. project managers, and construction managers) The owner or specifier should always require have educational session credits through an an experienced and qualified shotcrete con- industry-appropriate continuing education tractor team for executing quality shotcrete program specifically addressing shotcrete work. With this in mind, the following are sug- design, construction, or administration gested attributes for an owner or specifier to (ACI certifications; ASA education sessions consider when selecting a qualified shotcrete including ASA Onsite Seminars; seminars; contractor. By seeking out a contractor with the or trade shows, such as World of Concrete, recommended qualifications below, the owner ACI conventions, and ASA meetings). or specifier may rest assured that the entire 10. An office or business base (with an address). shotcrete construction team—including a 11. References (including those from the five qualified contractor, ACI Certified Nozzleman, projects in Item #2). and experienced crew—has proven its ability to 12. Affiliations. consistently place quality concrete by the shot- 13. Full disclosure of any criminal or fraudulent crete process. rulings for shotcrete work against former or Qualified contractors should have: current company owners in a 5-year period. 1. Five years of experience as a licensed contractor. 2. Five shotcrete projects of similar size, scope, Summary and process (dry- or wet-mix) which were suc- To consistently produce quality shotcrete work, cessfully completed within 5 years and have the shotcrete contractor and key personnel all proper documentation, including full contact require proper qualifications through training in information for the owner/engineer/construc- shotcrete materials, equipment, placement tion manager/general contractor, a project des- methods, curing, and protection to handle a par- cription, and the scope of work accomplished. ticular project. It must be stressed that training in 3. The ability to self-perform all shotcrete-related only one of these elements cannot guarantee suc- work and a minimum crew and staff listed as cess, and poor performance or lack of shotcrete part of the company (either employees or knowledge by any member of the crew can cause substitutes with a work history under the cur- a substandard finished product. rent business name) consisting of the following Simply specifying the use of an ACI Certified minimum experienced field crew members: Nozzleman WILL NOT guarantee successful Shotcrete • Summer 2013 31


2013SumShotcreteEMag
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