redi-rock.com © 2019 Redi-Rock International, LLC Redi-Rock Installation Guide

redi-rock.com © 2019 Redi-Rock International, LLC Redi-Rock Installation Guide V19 | 23 Redi-Rock Magic Block freestanding hollow-core units are stacked, similar to other Redi-Rock freestanding blocks, but then filled with concrete. Freestanding Hollow-Core Blocks work well for freestanding barriers, and can also be utilized for cantilever retaining walls. CANTILEVERED WALLS For many applications, the Freestanding Hollow-Core Blocks will be supported by a reinforced concrete footing. Prior to placing the footing, layout the wall to determine the locations of the open cores in the staggered rows of hollow-core units. This will help determine where rebar should be placed in the footing. When determining vertical rebar placement, consider the equipment that will be used to set the block to help avoid conflicts. Number and size of rebar will depend upon the engineer’s structural design. Construct the footing on a competent subgrade per the design drawings. Once the footing has cured, use a stringline to mark the alignment of the blocks (usually the inside of the block). Begin setting blocks. A scis- sors-type clamp works well. (Figure 25) Alternatively, straps looped around the interior ribs can be used, as well. 14. MAGIC BLOCK HOLLOW-CORE FREESTANDING WALLS Figure 25 INSTALLING REDI-ROCK redi-rock.com © 2019 Redi-Rock International, LLC 24 | Redi-Rock Installation Guide V19 Corners can be constructed in the wall using hollow-core corner blocks. These blocks have texture on three sides. For a tight fit between blocks, the texture on the corner block can be trimmed by 2 or 3 inches where it abuts the adjacent block. If the design requires continuous rebar, cut a section out of the side of the corner block aligned with the hollow core of the adjacent block. (Figure 26) Place horizontal rebar in the blocks, supported in the grooves on the interior structural ribs. Place the vertical rebar, lapping and tying, as required. Stack the next row of block, making sure to carefully align the blocks and staggering the joints to create a running bond. We recommend stacking no more than three courses of block without filling the core. Prior to infilling the wall, we suggest grouting the joints between blocks with non-shrink standard grout. This helps prevent leakage during infilling, and provides an aesthetic element. Infill the hollow core of the wall with ready-mix concrete meeting the requirements of the design. Place the concrete carefully to prevent misalignment of the rebar. While filling, use an internal concrete vibrator to ensure consolidation and eliminate voids. Figure 26 redi-rock.com © 2019 Redi-Rock International, LLC Redi-Rock Installation Guide V19 | 25 COPING Magic Block Freestanding Hollow-Core Blocks can be placed on Redi-Rock PC-series walls to create a free- standing coping. The connection uses a No. 3 rebar hook to tie the coping to the upper PC blocks. Install a No. 3 rebar hook through the lifting hook in each PC block and let the hook lay on the shear knob. Install PC geogrid strips, if required. Fill the PC core with stone to the recess area. Place plastic sheeting over the geogrid exposed in the PC core. Set the Freestanding Hollow-Core Blocks in place on the PC blocks. Install the horizontal and vertical reinforcing steel, as required by the design. Pull the rebar hooks up into the Freestanding Hollow-Core Blocks core and engage with the horizontal rebar. Fill the hollow cores with concrete. (Figures 27 & 28) Figure 27 Figure 28 INSTALLING REDI-ROCK redi-rock.com © 2019 Redi-Rock International, LLC 26 | Redi-Rock Installation Guide V19 WATER CONTROL APPLICATIONS A few additional details can be incorporated into Freestanding Hollow-Core walls to improve their water-tightness for flood control and other water-related applications. (Figure 29) Prior to constructing the footing, perform any subgrade preparation, soil improvements, and/or drainage installation as required by the design. Install an appropriate waterstop at the joint between the footing and the bottom of the wall, following the waterstop manufacturer’s recommendations. When using a ribbed center bulb strip, install it prior to pouring concrete for the footing such that it will be half embedded in the footing. Commonly, it will require attaching to the footing rebar with wire ties. A bentonite/butyl rubber expandable waterstop can be installed on top of the footing prior to installing the first row of blocks. Be sure to protect the strip from damage and keep it clean. A keyway can be cast into the footing if required by the design. Avoid block-to-block joints where structural ribs from adjacent blocks will be in contact, as this will result in a joint with little, if any, cast-in-place concrete available to resist water flow. If necessary, remove one of the offending ribs with a concrete saw. When placing concrete, extra care should be taken to fully consolidate the concrete to eliminate voids which could become conduits for water. Integral crystalline waterproofing admixtures are available that can reduce permeability and seal small cracks. Additional measures, such as sealing exposed joints with non-shrink grout and/or mastic and casting a slab against the wall can also be used to reduce water penetration. Founda- tion waterproofing experts should be consulted to select and assist with the installation of any performance improvement measures. CONTROL JOINT MATERIAL. LEAVE CENTER GAP FOR WATERSTOP PVC RIBBED CENTER BULB WATERSTOP. SECURE TO ADJACENT VERTICAL REBAR WITH WIRE HOLES IN CONTROL JOINT MATERIAL FOR REBAR F-HC FREESTANDING BLOCKS RIBBED CENTER BULB WATERSTOP CAST INTO FOOTING CAST IN PLACE CONCRETE FOOTING CUT BLOCK RIB ADJACENT TO WATERSTOP (IF REQUIRED) Figure 29 uploads/s3/ 23-hollow-core-guiderr-installguide-v19-final-web.pdf

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