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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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This document applies to structures in regions of high seismic risk or to structures assigned to high seismic performance or design categories. It defines the minimum experimental evidence that can be deemed to satisfy the use of unbonded post-tensioned precast structural walls (shear walls) for bearing wall and building frame special reinforced concrete shear wall systems, as defined in ASCE/SEI 7-10, when those walls do not fully satisfy the intent of the prescriptive requirements of Chapter 18 of ACI 318-14. This document includes mandatory Acceptance Criteria and nonmandatory Commentary, and has been written in such a form that its requirements can be coordinated directly with the requirements for special precast structural walls in 18.11 of ACI 318-14. Among the subjects covered are requirements for the procedures that shall be used to design unbonded post-tensioned precast test modules and their configurations, as well as requirements for testing, reporting, and assessing satisfactory performance of the test modules.
The Collection Online includes all new committee standards and reports released throughout the year. The most recently added include:
439.5R-18 Guide for the Specification, Manufacture, and Construction Use of Welded Wire Reinforcement
216.1M-14(19) Code Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies (SI Units)
225R-19 Guide to the Selection and Use of Hydraulic Cements
550.6-19 Acceptance Criteria for Special Unbonded Post-Tensioned Precast Structural Walls Based on Validation Testing and Commentary
550.6M-19 Acceptance Criteria for Special Unbonded Post-Tensioned Precast Structural Walls Based on Validation Testing and Commentary (SI Units)
548.8M-19 Specification for Type EM (Epoxy Multi-Layer) Polymer Overlay for Bridge and Parking Garage Decks (SI units)
563M-18 Specifications for Repair of Concrete in Buildings (SI units)
562M-19 Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures and Commentary (SI units)
506.4R-19 Guide for the Evaluation of Shotcrete
526R-19 Guide for Design and Construction with Autoclaved Aerated Concrete Panels