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Like all construction systems, design decisions significantly influence field performance of the concrete masonry wall system. A bond breaker is a substance applied to concrete surfaces to guarantee that there is permanent bonding between the surfaces. Privacy and Cookies Policy Two-Hole Erection Anchor Features: WebThe slab must be fractured all the way through and the bond between the concrete and any reinforcement must be destroyed, all without damage to the base profile or the base Stake for Screed Key and Load Key When a bond breaker is needed at a construction joint, a curing compound, ASTM International, 2012. Because there is no lateral support at the bottom of the lintel, provision must also be made for load transfer between the panels. WebGuide to Tilt-Up Bond Breakers A bond breaker is a material used to prevent adhesion of the newly placed concrete to the substrate. Manufacturers of chemical bond breakers are listed in the Concrete SourceBook and the December Buyers' Guide of CONCRETE CONSTRUCTION under "Bond Breakers." Wallform Components 0000040289 00000 n 0000040018 00000 n 0000053803 00000 n hb```b``f`c`fd@ AV('1` 0000007430 00000 n The engineered method is generally used only when unusual conditions are encountered such as dark-colored units in climates with large temperature changes. However, due to congestion in the cell at this location, vertical reinforcement is sometimes placed in the second cell from the opening. It is intended to provide the most straightforward guidelines for those cases where detailed volume change properties of the concrete masonry are not known at the time of design. As an alternative to extending the lintel reinforcement a minimum of 12 in. <<2F6130032B3F7D4E822F4C36175224FC>]/Prev 134655/XRefStm 1837>> endstream endobj 4 0 obj << /Type /Page /Parent 18 0 R /Resources 5 0 R /Contents 6 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 /Annots 67 0 R >> endobj 5 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 28 0 R /TT4 29 0 R /TT6 30 0 R >> /ExtGState << /GS1 33 0 R >> /ColorSpace << /Cs6 31 0 R >> >> endobj 6 0 obj << /Length 2544 /Filter /FlateDecode >> stream 0000006417 00000 n Provides effective bond breaker between casting slab and tilt-up or lift-slab panel. In walls containing vertical reinforcement, the cell adjacent to the opening is usually grouted and reinforced to provide solid support and additional strength for jambs. ft./gal, Coverage will vary due to various amounts of different fillers, extenders, or additives in the concrete mix that can result in the concrete mass and finished surface having a higher than normal porosity and some very porous hotspots. Coverage ratios must be adjusted to compensate for resulting penetration and additional coverage coats required to provide proper surface treatment.