Masonry Magazine April 1992 Page. 32
TABLE 5
Corrosion Protection Requirements
Tie Type and Exposure Condition
Corrosion Protection
Stainless steel, any exposure
ASTM A 167. Type 304
Joint reinforcement in interior walls
ASTM A 641, 0.1 oz/ft
Joint reinforcement, wire ties or wire anchors in exterior walls or interior walls exposed to moist environments
ASTM A 153, Class B
Sheet metal ties or anchors in interior walls
ASTM A 525, Class G60
Sheet metal ties or anchors in exterior or interior walls exposed to moist environments
ASTM A 153, Class B
Steel plates and bars (as applicable to size and form specified)
ASTM A 123 or ASTM A 153, Class B
Tailing and placement of reinforcement and accessories which include tolerances.
Corrosion Resistance. Conventional corrosion protection methods attempt to protect metals embedded in masonry by isolating them with impervious coatings, by using metals that are corrosion resistant or by providing cathodic protection. ACI 530.1/ASCE 6 provides requirements for corrosion protection for carbon steel by galvanized coatings. The amount of galvanizing required increases with the severity in exposure of the masonry wall. Anchors, ties and joint reinforcement must meet minimum corrosion protection requirements. Table 5 shows the minimum corrosion protection requirements needed for metal accessories used in masonry walls.
Construction
Construction requirements within ACI 530.1/ASCE 6 cover the conventional construction practices used in projects that involve empirically designed masonry. The provisions are similar to those found in the model building codes. The basic premise under the construction requirements is to ensure proper placement of materials. Mortar joint filling depends on the type of unit used in construction. Solid units have full head and bed joints. Hollow units are laid with face shell bedding. Requirements include tolerances for erection, collar joints and placement of embedded items such as wall ties and reinforcement. Grout placement is also covered.
SUMMARY
This Technical Notes reviews empirical design procedures contained in ACI 530/ASCE 5. The discussion centers on the requirements which are needed by engineers and architects to fully understand the empirical design of masonry structures within the limits of Chapter 9.
The information and suggestions contained in this Technical Notes are based on the available data and the experience of the engineering staff of the Brick Institute of America. The information contained in this publication must be used with good technical judgment. Final decisions on the use of materials and suggestions contained herein are not within the purview of the Brick Institute of America and must rest with the project architect, engineer and owner.