Polylok, Inc., has introduced Rebar-Lok to ensure that reinforcing rods in concrete masonry units (CMU) are properly positioned during wall construction.
Polylok, Inc., has introduced Rebar-Lok to ensure that reinforcing rods in concrete masonry units (CMU) are properly positioned during wall construction. The new product centers rebar in the block’s core and allows the mason to install units in lifts ranging to 10 and 12 ft. Small bar ties are used to lock the reinforcement in place and join additional rebar to the fixed central rod.
Emphasizing Rebar-Lok’s benefits in view of evolving building codes mandating increased CMU wall reinforcement to meet seismic and wind-load requirements, product developers note that vertically reinforced cells function properly only when centered rebar is encased by grout distributed evenly around the rod. Traditional means of achieving quality control in reinforcement by installing 8-ft. sections of overlapping rebar in 4-ft. lifts, they add, now have been surpassed by a method that optimizes rod positioning as it doubles lift range. Thus, Rebar-Lok offers a procedure that aids quality control, while reducing material and labor costs, plus downtime.
Instead of pouring or pumping grout every four feet and lifting block over the rod at each reinforced cell, masons using Rebar-Lok mark the grout cell in several locations, ensuring proper rebar installation from whatever height. Marking is accomplished by a bar-tie wire that extends through the wall and remains in place until after rebar is installed, thereby allowing clear identification of each cell.
For installation and engagement of the reinforcement-centering system, the mason locates each rod extending from the foundation and places the first Rebar-Lok unit directly above its topmost point. Mortar is then applied on both sides of the device, and normal installation ensues.
Some flexibility in vertical spacing between each Rebar-Lok is permitted. While increasing the distance beyond four feet provides greater economy, exceeding eight feet typically is not recommended. Once spacing has been determined, the mason installs Rebar-Lok units above the foundation rod as the wall is erected.
When the wall reaches the highest predetermined grout level, rebar is installed in one long section. Following placement of rebar in the core, engagement is achieved by firmly pulling the wire fastener to automatically center and secure the rod. According to the manufacturer, Rebar-Lok has a neutral effect on subsequent grout infiltration of the cavity. The process is completed by cutting the rebar wire flush with the wall and striking off the mortar joint, as necessary. Û www.polylok.com, 888/765-9565