1043. 2(a) 1043. 3(b)
or volume according to AASHTO M 157 or AASHTO M 241. For pre -packaged dry -mixes, provide mixes according to ASTM C1480, and from a manufacturer listed in Bulletin 15.
1043.3CONSTRUCTION —
Assign a shotcrete crew supervisor that has at least 5 years’ experience in shotcrete repair work on projects of similar size and character . Provide nozzlemen who are certified by the ACI for application of the proposed shotcrete process for bot h vertical and overhead surface and who have successfully completed three projects, of similar size and character . Submit written documentation to the Structure Control Engineer at least 10 working days before start of shotcrete work, which provides the following:
• Proof of experience for shotcrete crew supervisor and nozzlemen. Submit three references for crew supervisor and nozzlemen from persons who were responsible for supervision of these projects.
• Mix designs and test records, showing all material sources and indicating conformance to project specifications for all shotcrete materials.
• Details of proposed forming, bracing, falsework, or temporary support systems.
• A field QC plan
Provide in the field QC plan at a minimum, the following:
• A list of the proposed shotcreting equipment, including water supply pumps, valves and mixing equipment. Provide brand name, model and capacity of proposed pump or gun and air compressor.
• Details of proposed means of preparing existing concrete substrate in areas to receive shotcrete.
• Details of proposed means of controlling line, grade , and reinforcement cover.
• Details of proposed methods for control and disposal of waste materials, including demolition slurries, blasting grits, concrete debris, waste shotcrete, rebound , and overspray.
• Details of the proposed curing procedures
Do not start shotcreting work until the Structure Control Engineer has reviewed and approved all submittals.
and disintegrated particles, and material that might impair the bond between the surfaces to be covered and the shotcrete mixture. Remove unsound concrete and mortar, as directed. After removal of unsound material, c lean sound surface. Clean existing reinforcement to SSPC -SP6 cleaning standards. Saturate the prepared