Source: American Concrete Institute, Farmington Hills, Mich.
ACI is accepting comments through January 17 on revisions to Committee 318’s benchmark, Building Code Requirements for Structural Concrete and Commentary, a draft of which is posted at www.concrete.org/pubs/standaction.asp. Among proposed changes for ACI 318-11:
- Adhesive anchor design requirements. Failure modes and corresponding nominal strengths are defined, as are requirements for testing and evaluation of adhesive anchors for use in cracked concrete or subject to sustained loads. New provisions also cover criteria for overhead adhesive anchors, seismic requirements for anchoring to concrete, installation and inspection of adhesive anchors, and certification of adhesive anchor installers;
- New sulfate resistance test methods—ASTM D516 and D4130 for sulfate ions in water, brackish water, or seawater; ASTM C1580 a test for water-soluble sulfate in soil;
- Test records for determining mix designs’ standard deviation now up to 24 months old; labs or agencies performing acceptance testing for concrete are bound by ASTM C1077;
- Enhanced reinforcement requirements for seismic applications, including rules for identifying and detailing distinct segments of a special structural wall, detailing of horizontal bars at special boundary elements, and confinement of beam flexural hinge regions;
- Deformed bar provisions allowing Grade 80 reinforcements per ASTM A615 and A706 for non-seismic applications; zinc and epoxy dual-coated reinforcing bars per ASTM A1055;
- New circular column tie detailing requirements; design and detailing of temperature and shrinkage reinforcement for post-tensioned slabs; and, minimum reinforcement for deep beams have been added.