ACI Tilt-Up Supervisor

During an erection safety meeting, who should be designated as the ONLY person authorized to give hand signals to the crane operator?

• AAny crew member who can see the load
• BThe rigging foreman (or a single designated signal person)
• CThe job superintendent
• DThe building inspector on site

As the tilt-up supervisor, which of the following is NOT required to be covered at the pre-lift erection safety meeting?

• ALocation of exclusion zones during panel lifts
• BEach worker's individual pay rate
• CReview of hand signals and communication plan
• DProcedure for reporting accidents or near misses

During the lift of a tilt-up panel, where should non-participating workers be positioned?

• AInside the panel footprint to steady braces
• BDirectly beneath the suspended load to spot cracks
• COutside the established exclusion zone
• DAnywhere within line of sight of the crane

At what point in the erection process should the supervisor verify that brace attachments have been fully tightened and secured?

• ABefore the panel is lifted from the casting bed
• BOnly at the end of the workday
• CAfter the panel is plumbed and before the crane is released
• DOnly when the foundation grout has cured

Which of the following is the MOST important reason to identify overhead obstructions during the pre-erection site walk?

• ATo plan crane boom angle and reach without contact
• BTo schedule the lunch break under shade
• CTo determine the color of panels
• DTo decide on the ready-mix supplier

Per OSHA 29 CFR 1926 Subpart CC, what is the minimum distance a crane and load must maintain from energized overhead power lines rated up to 50 kV?

• A5 feet
• B10 feet
• C20 feet
• D50 feet

Which document is the primary reference a tilt-up supervisor uses to determine panel sizes, reinforcement, embeds, and opening locations for a project?

• AThe general contractor's daily report
• BPanel drawings and the panel book
• CThe OSHA 30 course handbook
• DThe ready-mix supplier's delivery log

A panel drawing issued by the lifting-insert supplier typically does NOT show which of the following?

• ALocation and quantity of lifting inserts
• BCalculated lifting weight of the panel
• CThe specified architectural paint color
• DRecommended rigging configuration

Which personnel are typically INVOLVED in determining the panel layout ("panelizing") for a tilt-up project?

• AThe architect, engineer of record, tilt-up contractor, and lifting insert supplier
• BOnly the crane operator
• COnly the rigging foreman
• DThe concrete finisher and ready-mix dispatcher

When sequencing panel casting and erection, which of the following is NOT a relevant consideration?

• ACrane position, reach, and pick weight
• BPanel size and weight distribution
• CDaily television ratings in the local market
• DSite access and ready-mix truck circulation

A pre-pour checklist for a tilt-up panel should verify all of the following EXCEPT:

• ABond breaker has been applied to the casting surface
• BReinforcement placement matches the shop drawing
• CLifting and bracing inserts are correctly located and tied
• DThe building roof diaphragm has been welded

What is the MOST important factor in selecting a crane for a tilt-up project?

• AThe crane's paint color
• BLifting capacity at the maximum required radius and boom length
• CWhether the crane has a cab heater
• DThe crane company's distance from the airport

When is an alternative casting method (stack casting, remote casting, or casting on temporary pads) MOST likely to be required?

• AWhen the building footprint is large enough to cast every panel on the finished slab
• BWhen there is insufficient floor slab area or access for casting every panel in place
• CWhenever the temperature drops below 80 degrees F
• DWhenever panels are less than 4 inches thick

A supervisor planning the lifting sequence must determine whether the crane will pick panels from INSIDE or OUTSIDE the building footprint. Which factor BEST drives that decision?

• AThe architect's preferred crane brand
• BThe panel layout, crane reach, and final building enclosure sequence
• CThe supervisor's personal preference on any given day
• DThe day-of-week for concrete delivery

A simple method to estimate the weight of a rectangular tilt-up panel is to multiply length x width x thickness by:

• A62.4 lb/ft^3 (water)
• B150 lb/ft^3 (normal-weight concrete)
• C27 lb/ft^3
• D490 lb/ft^3 (steel)

A 40 ft long x 25 ft wide x 7 in thick normal-weight concrete panel has an approximate lifting weight of:

• AApproximately 21,000 lb (10.5 tons)
• BApproximately 87,500 lb (43.8 tons)
• CApproximately 175,000 lb (87.5 tons)
• DApproximately 500 lb

From a supervisor's standpoint, which building type is MOST commonly built with tilt-up concrete construction?

• AHigh-rise residential towers over 20 stories
• BSingle-story and low-rise commercial, warehouse, and distribution buildings
• CSingle-family residential homes
• DReinforced masonry chimneys

Which role is the supervisor NOT typically responsible for in tilt-up panel layout decisions?

• ACoordinating panel layout with the engineer of record
• BConfirming casting areas will fit on the available slab
• CIndependently redesigning panel reinforcement without engineer review
• DFlagging panels that cannot be picked within the planned crane reach

A key supervisor concept: which of the following makes tilt-up construction particularly sustainable compared to alternative wall systems?

• ALong shipping distances for pre-fabricated panels
• BOn-site casting eliminates panel transportation and uses local materials
• CUse of exotic imported concrete admixtures
• DReliance on solvent-based coatings

Which ACI committee report provides design and construction guidance specifically for tilt-up concrete structures?

• AACI 318 only
• BACI 301 only
• CACI 551.1R and ACI 551.2R
• DACI 211.1

In a typical tilt-up building, what primarily resists the lateral (wind and seismic) loads applied to the walls?

• AThe steel columns alone
• BThe panels acting as shear walls and the roof acting as a diaphragm
• CThe asphalt parking lot pavement
• DThe temporary bracing left in place permanently

If the engineer specifies 3/4 inch minimum reinforcement cover in a tilt-up panel, what does that mean?

• ABars must be placed at least 3/4 in. above the concrete surface
• BThe clear distance from any bar to the nearest face of concrete is at least 3/4 in.
• CBars must be spaced at 3/4 in. on center
• DPanels must be at least 3/4 in. thick

A hairline crack that appears in a panel AFTER stripping but BEFORE lifting:

• ACan always be ignored — all concrete cracks
• BMust be evaluated; notify the engineer if it exceeds the TCA guidance for crack width or…
• CImmediately requires rejection of the panel
• DIs only a concern if the panel will be painted

Placing reveals (grooves) in the face of a tilt-up panel can impact the panel's structural performance because reveals:

• AAdd compressive strength to the concrete
• BLocally reduce the effective panel thickness and concentrate stress
• CEliminate the need for reinforcement
• DReplace the need for a bond breaker

Lifting loads can impose stresses on a tilt-up panel that exceed in-place service loads because:

• AThe panel is a shorter member during service
• BLifting introduces bending about the weak axis and dynamic multipliers while the concrete…
• CPanels are always stronger in the flat position
• DWind loads are always applied at the moment of the lift

Which of the following is NOT typically part of a shallow foundation system for a standard tilt-up building?

• APerimeter strip footings beneath the exterior panels
• BInterior footing pads or continuous footings for column supports
• CDeep-drilled caissons extending 50 ft below grade for interior columns
• DThickened slab edges around interior bearing walls

Which of the following is NOT a standard term used to describe the stiffness or bearing characteristics of a subgrade?

• ASubgrade modulus
• Bk-value
• CS-factor
• DCalifornia Bearing Ratio (CBR)

Why is adequate subgrade compaction critical for a tilt-up casting slab?

• AWeak subgrade can cause floor curling, cracking, and uneven panel finishes
• BGood compaction speeds up concrete curing
• CCompaction is only needed for decorative finishes
• DCompaction has no effect on slab performance

A typical detail calls for a small gap between the bottom of a tilt-up panel and the top of the perimeter footing. That gap exists to:

• AAllow fresh air into the building
• BAllow panel placement tolerances and be packed with non-shrink grout after alignment
• CProvide drainage for rainwater
• DCreate a thermal break

The strength of the subgrade beneath a crane set-up area is critical because:

• ASoft subgrade can allow the crane outriggers or tracks to settle, causing loss of level a…
• BThe crane hook uses subgrade as a counterweight
• CSubgrade affects only the concrete mix design
• DIt only matters for decorative work

Which of the following is the MOST critical benchmark to verify before casting panels on a new floor slab?

• AOverall slab color
• BFloor flatness (F-number) and levelness across the casting area
• CJoint sealant color
• DThe brand of power trowel used

Correctly applied bond breaker should appear on the slab surface as:

• AA puddled uniform coating
• BA slightly darkened uniform appearance with no dry spots and no puddles
• CThicker over inserts and thinner elsewhere
• DVisible only in patches near the perimeter

The minimum slab thickness and reinforcement beneath a braced panel connection is important because:

• AIt governs the pull-out capacity of the brace anchor cast or drilled into the slab
• BIt affects only the color of the finished slab
• CIt determines the panel paint schedule
• DIt only matters for seismic Zone 4

Each of the following helps MINIMIZE curling of a floor slab EXCEPT:

• AUsing a thicker slab
• BPlacing control joints closer together
• CCuring to reduce the moisture gradient between top and bottom of the slab
• DEliminating all reinforcement from the slab

A closure strip in a tilt-up casting slab is used to:

• AProvide a flat continuous casting area beneath panels by closing control joints after pan…
• BPrevent bond breaker from being applied
• CServe as the permanent structural diaphragm
• DHold the bracing braces in place during the lift

When casting a panel that crosses a floor slab control joint, which is NOT an acceptable method to temporarily fill the joint?

• ACaulk
• BSand
• CDrywall joint compound
• DFlowable asphalt

Why is it critical to cure the floor slab of a tilt-up project?

• ATo achieve the specified concrete strength, flatness, and durability that the slab and pa…
• BBecause curing is only required for stamped decorative surfaces
• CTo accelerate floor color changes
• DCuring is optional for tilt-up slabs

Before applying bond breaker to a floor slab that was just cured with a membrane-forming compound:

• AAlways assume compatibility and apply bond breaker directly
• BVerify chemical compatibility of the curing compound and the bond breaker per the manufac…
• CRemove all reinforcement in the panel first
• DPour a second concrete topping

Which factor LEAST affects the layout and sequencing of tilt-up panel casting?

• ACasting slab size, location, and number of panels
• BLocation of bracing inserts
• CSite access and crane circulation
• DColor of the general contractor's office trailer

Before casting a panel, the crew should verify each of the following EXCEPT:

• AReinforcement location and cover
• BForm dimensions and squareness
• CInsert locations and orientation
• DThat the rooftop HVAC units have been installed

What is the primary purpose of a chamfer strip on the edge of a tilt-up panel form?

• ATo prevent panels from bonding together
• BTo produce a clean beveled edge and reduce corner spalling during stripping and erection
• CTo increase panel thickness
• DTo hold reinforcement in place

When installing lifting and bracing inserts, which tolerance is MOST important?

• AInsert color
• BPosition, orientation, and embedment depth per the lift supplier's drawing
• CThat inserts are hidden from the crew
• DThat inserts match the panel paint scheme

Which of the following is NOT a typical material used to form tilt-up panel edges?

• ADimensional lumber (2x material)
• BSteel edge forms
• CAluminum edge forms
• DUncured structural steel wire rope

The interaction between bond breaker and reinforcement requires that:

• ABond breaker be allowed to coat the reinforcement steel as much as possible
• BReinforcement be placed AFTER the bond breaker is applied and the steel kept free of bond…
• CReinforcement be painted with bond breaker
• DBond breaker be mixed into the concrete

Which of the following is the MOST important check when placing reveal strips on a casting bed?

• AReveal color only
• BAccurate location, alignment, and secure attachment so they do not shift during concrete…
• CThat each reveal has a manufacturer label visible
• DThat reveals are placed after concrete is vibrated

Which document or reference is typically used to find design information on lifting inserts, strongbacks, and panel lifting strength?

• AThe lifting insert manufacturer's engineering manual and the project's lift design drawin…
• BThe local phone book
• CA generic homebuilding manual
• DOSHA's fall protection standard