ACI Tilt-Up Supervisor key terms

A concrete wall element cast flat on a horizontal bed and then tilted upright into its final vertical position, usually serving as both structural wall and exterior finish.

The prepared, level, and smooth horizontal surface on or adjacent to the slab where tilt-up panels are formed, reinforced, and cast before lifting.

A membrane or coating applied to the casting surface so cured panel concrete releases cleanly instead of adhering to the slab or bed beneath it.

A drawing that fixes each panel's size, shape, location, orientation, and cast sequence on the site, coordinating openings, joints, and lifting points.

The perimeter formwork that confines fresh concrete and defines a panel's outer edges, thickness, and any reveals, chamfers, or rustication profiles.

A recessed groove or reveal formed in a panel face or joint line to create a shadow line and control the appearance of cracking or joint movement.

A material applied to forms and casting surfaces to prevent concrete from bonding, allowing clean stripping without damaging the panel face or edges.

The dimensional description of a panel including its length, height, thickness, openings, edge profiles, and any non-rectangular shape affecting lifting and stability.

The ratio of a panel's height to its thickness or width, used to judge slenderness and how vulnerable the panel is to cracking or instability during lifting.

The point where a panel's weight is considered concentrated; lifting hardware is arranged around it so the panel hangs level and predictable during hoisting.

A cast-in device such as a coil, ferrule, or lifting loop embedded in the panel that transfers hoisting forces from the crane rigging into the concrete.

Any item cast into a panel for later connection or support, including plates, angles, anchors, sleeves, and inserts positioned per the shop drawings.

The plates, angles, bolts, welds, and anchors that tie erected panels to the foundation, roof structure, and adjacent panels after lifting.

A cast-in or post-installed anchor in the slab or panel that receives the temporary bracing used to hold an erected panel plumb and stable.

Adjustable struts and anchors installed to hold a freshly erected panel in position against wind and construction loads until permanent connections are complete.

A stiffening beam or truss temporarily or permanently attached to a panel to increase its bending resistance during lifting and erection.

The slings, shackles, spreader beams, and related hardware that connect a crane hook to a panel's lifting inserts and distribute hoisting forces.

A rigid lifting beam used between the crane hook and slings to keep sling legs near vertical and reduce horizontal compression in the panel during lifting.

The internal force induced in a panel by hoisting loads, which is highest before the panel is fully vertical and must be checked against its concrete strength.

The compressive strength a panel must reach before hoisting, verified by field-cured cylinders or maturity methods per the lifting design assumptions.

A compression test of a field-cured concrete specimen used to confirm the panel has achieved the strength assumed for lifting, stripping, or post-tensioning.

Maintaining adequate moisture and temperature in fresh concrete so it gains strength and durability; curing is especially important before early panel lifting.

A liquid applied to finished concrete that forms a membrane slowing moisture loss, used where wet curing or coverings are impractical on a casting bed.

The specified surface treatment of a panel face, such as broom, exposed aggregate, or smooth form finish, established by the casting surface and finishing methods.

A concrete floor slab cast directly on prepared subgrade, which may also serve as the casting bed or support the panel forms and lifting equipment.

The compacted soil beneath a slab or casting bed, prepared and graded to provide uniform support and prevent settlement or cracking of the concrete above.

An impermeable sheet placed beneath a slab to limit moisture migration from the ground into the concrete and finished floor assembly above.

The earthwork, grading, compaction, and access work done before construction so the casting area, crane paths, and foundations are stable and properly drained.

The planned route and standing locations for the lifting crane, evaluated for bearing capacity, slope, overhead obstructions, and clearance to erected panels.

A written document identifying the crane, rigging, load weights, radii, ground conditions, sequence, and responsibilities for a specific panel lifting operation.

A lift that exceeds defined thresholds such as high load percentage, multiple cranes, or personnel under load, requiring a more detailed engineered lift plan and review.

A structured review of each task that identifies hazards, assesses risk, and documents controls and responsible persons before work begins on site.

A marked area beneath and around a hoisted panel where unauthorized people are prohibited during lifting, erection, and bracing operations.

The sequence of tilting a panel from its casting bed to vertical, positioning it on its foundation, and securing temporary bracing and permanent connections.

The force exerted by wind on an erected or temporarily braced panel, which governs bracing design and may require stopping work above defined speeds.

A detailed fabrication and erection drawing prepared by the contractor showing panel dimensions, reinforcement, embeds, openings, and connection details for review.

The planned inspections, tests, and documentation used to verify that materials, dimensions, and workmanship meet the project specifications and approved drawings.

The permissible variation from a specified dimension or position, such as panel plumbness, joint width, or embed location, within which work is accepted.

Steel bars, mesh, or fibers placed in a panel to resist tensile and shrinkage stresses, positioned per drawings with specified cover and lap lengths.

The concrete depth between the outer surface of embedded steel and the nearest exposed face, protecting reinforcement from corrosion and fire.

The overlapping length of two reinforcing bars that transfers force between them through bond with the surrounding concrete.

A planned separation between panels or within a slab that accommodates movement, defines panel boundaries, and often carries sealant or connection hardware.

A shallow recessed detail formed in a panel face or edge, used for architectural shadow lines, jointing, or to receive sealant and flashing.