Masonry Magazine April 2002 Page. 16
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TMS/continued from page 14
flection. The height limitation of 12 ft (3.7 m), in conjunction with deflection limitations, addresses these concerns.
Removal of Drip Ties
The use of wall ties with drips (bends intended to inhibit the migration of moisture from one masonry wythe to other) has been eliminated from the Code due to their reduced load-carrying capacity. This removal was also due in part to the recognition that such ties do not perform their intended function of reducing moisture migration when improperly installed.
Protection Requirements for Reinforcement
Corrosion protection provisions, which were previously covered by the Specifications, have been added to the Code. Different requirements apply for joint reinforcement, wall ties, and anchors depending upon their intended use or exposure conditions. When these elements are exposed to earth, weather, or are installed in masonry exposed to a mean relative humidity exceeding 75 percent, they are required to be manufactured from stainless steel, epoxy coated, or hot-dipped galvanized. As a minimum, all other joint reinforcement and wall ties are required to be mill galvanized. When not exposed to earth, weather, or are not installed in masonry exposed to a mean relative humidity exceeding 75 percent, anchors need not be coated.
Quality Assurance for Prestressed Masonry
As part of the continuing effort related to the integration of prestressed (post-tensioned) masonry design into the Code (first introduced in the 1999 edition), the 2002 Code includes new quality assurance (QA) provisions for Level 2 (moderate) and Level 3 (rigorous) programs. The intention of these new QA provisions mimics the inspection requirements of conventional masonry construction. Hence, for projects requiring verification of grout placement, this requirement would also extend to prestressing grout. Similarly, when inspection of reinforcement location is mandated, this would also apply to the prestressing tendons.
Grout Demonstration Panels
The MSJC Specification has limited the maximum grout pour height or lift height based on the minimum grout (more on page 18)
16 MASONRY APRIL, 2002