Shotcrete specimens are solid; there are no laminations, sandy area or voids. Small air voids within a maximum diameter of 1/8 inch and maximum length of 1/4 inch are normal and acceptable. Sand pockets, or voids behind continuous reinforcing steel are unacceptable. The surface against the form or bond plane shall be sound, without a sandy texture or voids.
Shotcrete specimens shall have no more than two laminations or sandy areas with dimensions not to exceed 1/8 inch thick by 1 inch long. The height, width, and depth of voids shall not exceed 3/8 inch. Porous areas behind reinforcing steel shall not exceed 1/2 inch in any direction except along the length of the reinforcing steel. The surface against the foam or bond plane shall be sound, without a sandy texture or voids.
Shotcrete specimens shall have no more than two laminations or sandy areas with dimensions exceeding 3/16 inch thick by 1-1/4 inch long, or one major void, sand pocket, or lamination containing loosely bonded sand not to exceed 5/8 inch thick and 1-1/4 inch in width. The surface against the form or bond plane may be sandy with voids containing overspray to a depth of 1/16 inch.
The core shall meet in general the requirements of Grade 3 cores, but may have two major flaws such as described for Grade 3 or may have one flaw with a maximum dimension of 1 inch (25mm) perpendicular to the face of the core with a maximum width of 1-1/2 inch. The end of the core that was shot against the form may be sandy and with voids containing overspray to a depth of 1/8 inch.
A core that does not meet the criteria of core grades 1 through 4, by being of poorer quality, shall be classified as Grade 5.
The Shotcrete Concrete Contractors Association (SCCA) has developed an education program. The Shotcrete Concrete Contractors Association(SCCA) has developed an education program that is current with all ACI Concrete industry standards. Session's are available thru ACI Local sponsoring groups.
Contact SCCA for Session Dates (408) 640-6219
Aci Shotcrete Nozzlemanb Certification Session. Evaluating/Assessing Encapsulation of Reinforcing in Shotcrete
Copyright © Shotcrete Concrete Contractors Association. All rights reserved.