Mortarless concrete block construction4/11/2024 ![]() ![]() Physical tolerances of dry-stack concrete units are limited to ± 1/ 16 in. Other units are fabricated with a combination of keys, tabs or slots along both horizontal and vertical faces as shown in Figure 1 so that they may interlock easily when placed. The latest and most sophisticated designs incorporate face shell alignment features that make units easier and faster to stack plumb and level. Specially designed units for dry-stack construction are available in many different conÞ gurations as shown in Figure 1. The provisions of this TEK do not apply to such systems due to a difference in design section properties (ref 8). ![]() Note that dry-stacked prestressed systems are available that do not contain grout or surface bonding. Unreinforced, reinforced, or prestressed. ![]()
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