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ACI Tilt-Up Technician study materials
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ACI Tilt-Up Technician practice questions

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Question 1Planning, Layout, and Site Preparation

Before a crane is mobilized to a tilt-up site, which condition must be confirmed along the planned travel route?

  1. The route has been chip-sealed for dust control
  2. The route is marked with panel identification signs
  3. The route is illuminated for nighttime pouring
  4. Soil bearing and compaction meet the erection plan Correct answer.

Explanation

Crane travel and set-up impose concentrated loads that the site plan must address. The route and crane pad must be graded and compacted to the bearing required by the erection plan. Dust control, signage, and lighting do not confirm structural support for the crane.

Question 2Planning, Layout, and Site Preparation

A project benchmark is established on a tilt-up site primarily to provide what?

  1. A fixed elevation reference for layout and grades Correct answer.
  2. A boundary marker for the property line
  3. A datum for crane load charts
  4. A storage location for survey stakes

Explanation

A benchmark is a fixed point of known elevation used as the reference for setting grades, slab elevations, and foundation layout. It allows all trades to work from the same vertical datum. It is not a storage point, a property boundary marker, or a crane load-chart input.

Question 3Planning, Layout, and Site Preparation

Before excavation for footings or piers, the contractor should do what?

  1. Assume utilities follow the building grid
  2. Verify that utility locate marks have expired
  3. Confirm public and private utilities are located and marked Correct answer.
  4. Backfill the area to protect buried lines

Explanation

Excavation can damage buried utilities, so public and private lines must be located and marked before digging. This step protects workers and prevents service interruptions. Backfilling, waiting for marks to expire, or assuming a layout are not acceptable substitutes for locating utilities.

Question 4Planning, Layout, and Site Preparation

The principal function of a bond breaker on a tilt-up casting bed is to do what?

  1. Provide a wearing surface for traffic
  2. Prevent the panel from adhering to the casting surface Correct answer.
  3. Improve bond between the panel and the slab
  4. Seal the slab against curing water

Explanation

A bond breaker creates a separation layer so the cast panel can be lifted without sticking to the casting bed. It must be applied uniformly and be compatible with the slab finish. It is not intended to increase bond, seal the slab, or serve as a wearing course.

Question 5Planning, Layout, and Site Preparation

When planning panel casting positions, the layout should ensure what?

  1. Each panel can be reached and lifted by the selected crane Correct answer.
  2. All panels are cast at the maximum crane radius
  3. Panels are cast in alphabetical order
  4. Panel joints align with the site fence

Explanation

Casting positions must be coordinated with crane reach, lifting radius, and rigging so every panel can be lifted safely. Panels blocked by other panels or placed outside the crane's capacity create erection problems. Alphabetical order, maximum radius, and fence alignment are not lifting requirements.

Question 6Planning, Layout, and Site Preparation

During tilt-up erection, the controlled access zone should be established to do what?

  1. Store panel bracing hardware
  2. Keep unauthorized personnel out of the erection area Correct answer.
  3. Mark the location of underground utilities
  4. Provide a parking area for concrete trucks

Explanation

A controlled access zone limits entry to the area where panels are being lifted and braced, reducing exposure to falling or swinging loads. Only essential personnel should enter under controlled conditions. The zone is not a storage, parking, or utility-marking area.

Question 7Planning, Layout, and Site Preparation

Batter boards are used in foundation layout to do what?

  1. Establish and preserve reference lines and elevations Correct answer.
  2. Support the concrete forms during pouring
  3. Measure concrete slump on site
  4. Protect the excavation from rain

Explanation

Batter boards are set outside the excavation and carry strings or marks that preserve foundation lines and elevations after excavation begins. They give a stable reference for rechecking layout. They are not form supports, weather protection, or concrete-testing equipment.

Question 8Planning, Layout, and Site Preparation

Which site condition should be addressed during tilt-up planning because it can affect panel lifting?

  1. The type of fencing around the site
  2. The location of the sales trailer
  3. Wind speed and direction during erection Correct answer.
  4. The color of the site office

Explanation

Panels can act as sails during lifting and before bracing is complete, so wind speed and direction must be considered in the lift plan. High or gusting wind may require postponing the pick. Office color, trailer location, and fence type do not control lifting stability.

Question 9Planning, Layout, and Site Preparation

A crane outrigger will be set on compacted fill. What is the most appropriate action before lifting?

  1. Reduce the crane counterweight to compensate
  2. Assume the fill is adequate because it is compacted
  3. Place the outrigger directly on the fill surface
  4. Verify the fill's bearing capacity and use a load-distributing pad Correct answer.

Explanation

Compaction alone does not confirm that the fill can resist outrigger bearing pressures. The planner should verify bearing capacity and use a properly sized pad to distribute the load. Assuming adequacy, bearing directly on the fill, or altering counterweight without engineering direction is unsafe.

Question 10Planning, Layout, and Site Preparation

Building grid lines are commonly offset from the actual column lines during layout so that what?

  1. They can be painted on the finished slab
  2. The grid can be hidden from the public
  3. String lines and stakes remain clear of construction operations Correct answer.
  4. They align with the crane's swing radius

Explanation

Offsetting control lines places stakes, strings, and marks outside the work area where they are less likely to be disturbed. The actual column line can then be re-established from the offset. Painting, concealment, and crane swing radius are not the reasons for offsetting grid lines.

Question 11Planning, Layout, and Site Preparation

Why is slab flatness particularly important for a tilt-up casting bed?

  1. It sets the panel's design lift weight
  2. It controls the color of the panel face
  3. It affects panel thickness uniformity and finished appearance Correct answer.
  4. It determines the curing compound application rate

Explanation

A tilt-up panel takes its face shape from the casting bed, so bed flatness influences thickness variation and the appearance of the finished panel. Excessive deviations can also complicate joint alignment and erection. Color, curing rate, and design lift weight are not governed by bed flatness.

Question 12Planning, Layout, and Site Preparation

When selecting a bond breaker for a casting bed, the contractor should confirm that it does what?

  1. Can be applied after the concrete is placed
  2. Will remain tacky during concrete placement
  3. Is approved for use as a curing compound
  4. Is compatible with the slab finish and subsequent coatings Correct answer.

Explanation

The bond breaker must allow separation without contaminating the panel face or interfering with later finishes. Compatibility with the casting surface and any subsequent coating is part of the selection. It should not be counted on as a curing compound, remain tacky, or be applied after concrete placement.

Question 13Planning, Layout, and Site Preparation

Lifting inserts for a tilt-up panel are positioned based on what?

  1. The panel's center of gravity and the engineer's lifting design Correct answer.
  2. The location of the nearest site entrance
  3. The preference of the concrete supplier
  4. The panel's exterior color pattern

Explanation

Lifting insert locations are set by the lifting design so the panel is balanced and the inserts and concrete have adequate capacity. The center of gravity and rigging geometry are central to that design. Site entrances, color patterns, and supplier preferences do not control insert placement.

Question 14Planning, Layout, and Site Preparation

Panel brace inserts should be located during the layout phase because they do what?

  1. Must align with the bracing plan and panel embedment Correct answer.
  2. Determine the concrete mix design
  3. Are installed after the panel is erected
  4. Replace the need for lifting inserts

Explanation

Brace inserts must be cast into the panel at locations that match the bracing plan and provide adequate embedment. Coordinating them during layout avoids conflicts with lifting inserts and panel joints. They do not set the mix design, replace lifting inserts, or get installed after erection.

Question 15Planning, Layout, and Site Preparation

When laying out panel casting positions, the crane's effective lifting radius is measured from what?

  1. The concrete truck to the casting bed
  2. The nearest utility pole to the crane
  3. The site boundary to the panel center
  4. The crane's rotation center to the panel's lifting point Correct answer.

Explanation

Crane capacity depends on the horizontal distance from the crane's rotation center to the load's lifting point at the required radius. The lift plan must account for that distance and the boom configuration. Site boundaries, concrete trucks, and utility poles are not the radius reference.

Question 16Planning, Layout, and Site Preparation

Panel joint widths and reveal locations are typically established by what?

  1. The crane operator
  2. The concrete truck driver
  3. The surveyor's benchmark
  4. The architectural and structural drawings Correct answer.

Explanation

Joint layout, reveal location, and joint width are design details shown on the project drawings. They coordinate panel appearance, sealant performance, and structural requirements. Drivers, operators, and the elevation benchmark do not set the joint design.

Question 17Planning, Layout, and Site Preparation

For a tilt-up casting bed that is also the building slab, saw-cut contraction joints should be what?

  1. Planned so they do not conflict with lifting inserts or brace locations Correct answer.
  2. Located only after panels are erected
  3. Cut through the panel lifting inserts
  4. Spaced at the contractor's discretion without a plan

Explanation

Saw-cut joints control slab cracking but must be coordinated with embedded items and panel lifting hardware. Cutting through or conflicting with inserts can damage the panel and compromise lifting. Joints should be planned before placement, not left until after erection.

Question 18Planning, Layout, and Site Preparation

Final site grading around a tilt-up building should direct stormwater in which way?

  1. Toward the crane pad
  2. Into the casting bed area
  3. Away from the building and toward approved drainage Correct answer.
  4. Toward the building footings

Explanation

Grading should slope away from the structure so stormwater does not pond against footings or enter the building. Water should be directed to approved drainage features. Directing water toward footings, the casting bed, or the crane pad can cause settlement, erosion, or unsafe working conditions.

Question 19Planning, Layout, and Site Preparation

During site planning, concrete truck access is important because what?

  1. Delivery delays can cause cold joints in the casting bed Correct answer.
  2. Trucks determine the panel joint width
  3. Trucks must be able to drive over lifting inserts
  4. Trucks must park inside the building footprint

Explanation

Concrete placement must proceed at a rate that prevents cold joints between deliveries. A planned truck route and unloading area help maintain continuous placement. Trucks should not park inside the footprint, drive over inserts, or set joint widths.

Question 20Planning, Layout, and Site Preparation

ACI 117 is relevant to tilt-up layout because it does what?

  1. Sets formwork plywood grades
  2. Specifies crane load charts
  3. Governs bond breaker chemical composition
  4. Provides standard tolerances for concrete construction Correct answer.

Explanation

ACI 117 establishes standard tolerances for concrete construction and materials, including many dimensional and elevation tolerances referenced in layout. Tilt-up planning uses those tolerances to set practical control limits. It does not specify crane charts, bond breaker chemistry, or plywood grades.

Question 21Planning, Layout, and Site Preparation

Panels are to be cast on a limited casting bed. Which planning approach best supports the erection sequence?

  1. Cast panels at the maximum distance from the crane
  2. Cast panels in an order that allows each to be lifted without being blocked by others Correct answer.
  3. Cast all large panels first and small panels last
  4. Cast panels in reverse alphabetical order

Explanation

Casting order should be coordinated with lifting access so that each panel can be reached and removed without moving or damaging other panels. This is a sequencing constraint, not a size or alphabetical rule. Casting at maximum crane radius would also reduce lifting capacity.

Question 22Planning, Layout, and Site Preparation

A geotechnical report gives an allowable bearing pressure for spread footings. Can this value be used directly for a crane outrigger pad?

  1. Yes, because pads spread the load over more area
  2. Yes, the footing value covers all construction loads
  3. No, crane outrigger pressures require a separate evaluation Correct answer.
  4. No, cranes are supported only by the building slab

Explanation

Footing design bearing pressure is developed for permanent foundation loads and does not automatically cover the concentrated, dynamic, and temporary loads from a crane outrigger. Outrigger bearing pressure, pad size, and ground conditions require their own evaluation. A pad helps distribute load but does not by itself prove adequacy.

Question 23Planning, Layout, and Site Preparation

Before erecting tilt-up panels, the planner should check wind conditions because what?

  1. Wind determines the bond breaker cure time
  2. Wind affects the concrete mix slump
  3. Panels can act as sails before bracing is complete Correct answer.
  4. Wind changes the panel's design thickness

Explanation

A panel exposed to wind before it is fully braced can receive significant lateral load and become unstable. The lift plan should set wind limits and require temporary bracing to be installed promptly. Wind does not change mix slump, design thickness, or bond breaker cure time in this context.

Question 24Planning, Layout, and Site Preparation

To reduce the risk of accumulated survey error when laying out a large tilt-up building, the surveyor should do what?

  1. Start each grid line from the previous grid line
  2. Use only a single tape measurement for all dimensions
  3. Tie grid lines back to primary control points at intervals Correct answer.
  4. Ignore the project benchmark after the first day

Explanation

Chaining from one grid line to the next can accumulate small errors across a large building. Tying back to primary control or the benchmark at intervals closes the layout and limits that accumulation. A single tape measurement and ignoring the benchmark increase error risk.

Question 25Planning, Layout, and Site Preparation

Lifting inserts placed too close to a panel edge can cause what?

  1. An increase in the panel's curing rate
  2. A reduction in the need for bracing
  3. Concrete breakout or edge spalling during lifting Correct answer.
  4. A change in the bond breaker color

Explanation

Lifting inserts transfer concentrated forces into the concrete, and insufficient edge distance can cause breakout or spalling when the panel is lifted. Insert locations must follow the engineer's design for edge distance and embedment. Curing rate, bracing need, and bond breaker color are unrelated to edge distance.

Question 26Planning, Layout, and Site Preparation

Before constructing a tilt-up casting bed, what should the planner confirm about buried utilities crossing the area?

  1. That they can remain in service during panel erection
  2. That they are deeper than the slab thickness
  3. That they are marked with paint only on the day of the pour
  4. That they have been located and either protected in place or relocated Correct answer.

Explanation

Buried utilities beneath a casting bed can be damaged by form stakes, insert placement, and construction loads. The planner must confirm the utilities are located and that each is protected or relocated before bed preparation begins. Paint marking alone does not protect a utility from damage.

Question 27Planning, Layout, and Site Preparation

Site benchmarks are established during tilt-up layout primarily to:

  1. mark the center of each panel
  2. replace the need for horizontal control lines
  3. provide a common elevation reference for footings, slab, and panels Correct answer.
  4. show the crane's swing radius

Explanation

A site benchmark gives all trades a single known elevation datum so footings, slab, and panel elevations remain consistent. Horizontal control lines are still required for plan location. A benchmark does not mark panel centers or crane swing limits.

Question 28Planning, Layout, and Site Preparation

Panel identification marks are shown on the casting layout mainly to:

  1. indicate the concrete mix design
  2. match each cast panel to its correct erection location Correct answer.
  3. record the ambient temperature at casting
  4. show where saw cuts should be made

Explanation

Each panel mark links the panel as cast to its required position in the finished structure. This helps the erection crew identify and place panels in the planned sequence. Mix design, temperature records, and saw-cut locations are controlled by other documents.

Question 29Planning, Layout, and Site Preparation

A concrete washout area on a tilt-up site should be located where?

  1. On a lined, contained area away from drainage paths Correct answer.
  2. Adjacent to the nearest storm drain for easy rinsing
  3. In the crane's lifting path to save walking distance
  4. Inside the building footprint so it is hidden

Explanation

Washout water contains cementitious material and must be contained so it does not enter storm drains or waterways. A lined pit or container placed away from drainage paths allows controlled disposal. Locating washout near drains or in the crane path creates environmental and safety problems.

Question 30Planning, Layout, and Site Preparation

When setting primary horizontal control for a large tilt-up project, where should the surveyor place control points?

  1. Off the building footprint in stable, protected locations Correct answer.
  2. At the crane's outrigger positions
  3. Along the casting bed centerline
  4. At the building corners, where they will be covered by footings

Explanation

Primary control points must survive excavation, footing, slab, and paving operations, so they should be set outside the active footprint in stable ground and protected from disturbance. Building corners and casting-bed centerlines are soon obstructed by construction. Crane outrigger positions are temporary and unsuitable for permanent control.

Question 31Planning, Layout, and Site Preparation

A planner is arranging casting positions for a tilt-up project. What is the main reason to keep panels within the crane's rated radius at the planned erection position?

  1. To allow the concrete trucks to drive over the panels
  2. To reduce the number of lifting inserts required
  3. To eliminate the need for panel bracing
  4. To ensure the crane can lift each panel safely without exceeding capacity Correct answer.

Explanation

A crane's lifting capacity decreases as the lifting radius increases. Panel casting positions must be planned so each pick falls within the crane's rated capacity at that radius. Keeping panels close to the crane does not remove the need for bracing or reduce the required insert design.

Question 32Planning, Layout, and Site Preparation

An area of soft, unstable soil is found along the planned crane travel path. What is the most appropriate planning action?

  1. Have the area evaluated and improved, or use a different crane path Correct answer.
  2. Fill the area with topsoil before crane arrival
  3. Route the crane over the area at reduced speed
  4. Assume the crane's outriggers will bridge the soft spot

Explanation

Soft ground can cause crane settlement, loss of stability, or outrigger penetration. The planner should have the condition evaluated and either improve the ground or choose a path that avoids it. Assuming outriggers bridge the soft spot or adding topsoil does not provide reliable support.

Question 33Planning, Layout, and Site Preparation

The casting bed area has a slight slope. What should the planner do to prepare it for panel casting?

  1. Fill low spots with loose, dry sand only
  2. Slope the bed toward the building interior
  3. Level the area and provide positive drainage away from the bed Correct answer.
  4. Leave the slope because it helps water run under the panels

Explanation

A casting bed needs uniform support to avoid panel distortion and thickness variation. The area should be leveled for casting while drainage is directed away from the bed so water does not pond beneath it. Loose sand filling or interior sloping can create settlement and ponding problems.

Question 34Planning, Layout, and Site Preparation

Which set of items is most important to coordinate on a tilt-up site logistics plan?

  1. Panel lift points, brace sizes, and insert types
  2. Paint colors, office furniture, and landscaping
  3. Concrete slump, air content, and cylinder breaks
  4. Crane positions, delivery routes, laydown areas, and access roads Correct answer.

Explanation

A site logistics plan organizes the movement and storage of people, equipment, and materials. It should show crane locations, delivery routes, laydown areas, and access roads so operations do not conflict. Mix properties and structural connection details are addressed by other plans and specifications.

Question 35Planning, Layout, and Site Preparation

A planned crane pick path passes beneath an energized overhead power line. What should the planner do first?

  1. Require the crane operator to watch the line during the lift
  2. Lower the boom quickly when passing under the line
  3. Plan a different path or establish the required de-energizing and clearance Correct answer.
  4. Use a spotter standing on the crane deck

Explanation

Energized overhead lines are a serious crane hazard, and clearance must be controlled by distance, barriers, or de-energizing according to the applicable safety requirements. The first planning step is to avoid the hazard or establish an approved clearance plan. Relying on the operator or a spotter does not provide required clearance.

Question 36Planning, Layout, and Site Preparation

During layout, a panel's cast-in embeds must align with the structural frame. Which action best controls this?

  1. Locate embeds from the same established control lines used for the panels Correct answer.
  2. Move embeds after the panel is erected
  3. Rely on the concrete crew to place embeds by eye
  4. Set embeds only from the nearest building corner

Explanation

Embeds and panels should be located from a common control system so their positions are consistent. Using the nearest corner alone can introduce local error and misalignment with the structural frame. Embeds cannot be casually moved after the panel is cast.

Question 37Planning, Layout, and Site Preparation

Where should tilt-up panels be stored before erection?

  1. Directly under the crane's boom tip in the building footprint
  2. On uncompacted fill so they settle evenly
  3. On the casting bed, with no dunnage
  4. On prepared, level ground with dunnage aligned to avoid damage Correct answer.

Explanation

Panel storage areas must be prepared and level so panels are not twisted or damaged. Dunnage should be aligned vertically to support the panel without inducing bending or cracking. Unprepared fill or storage directly in the lifting path creates safety and quality problems.

Question 38Planning, Layout, and Site Preparation

To reduce accumulated survey error across a large tilt-up building, the surveyor should:

  1. rely only on the building's finished slab joints
  2. establish a closed traverse or use total-station control and check against a second benchmark Correct answer.
  3. measure every point with a single long tape from one corner
  4. set control points after panels are erected

Explanation

A closed traverse or total-station control checked against independent benchmarks limits the buildup of error across long distances. Measuring repeatedly from one corner accumulates error with each measurement. Control must be established before construction, not after panels are erected.

Question 39Planning, Layout, and Site Preparation

A crane outrigger pad is planned over a buried storm drain. What is the best course of action?

  1. Place the outrigger pad directly on the pipe alignment
  2. Evaluate the pipe's capacity or relocate the outrigger to a suitable location Correct answer.
  3. Remove the pipe before the lift without notifying anyone
  4. Assume the pipe will carry the load because it is buried

Explanation

Outriggers impose concentrated loads that a buried drain pipe may not be designed to resist. The planner should evaluate the pipe's capacity and either protect it or relocate the outrigger to suitable ground. Unauthorized removal of a utility is not acceptable.

Question 40Planning, Layout, and Site Preparation

The casting bed will be built on expansive clay. What is the most important planning consideration?

  1. The clay will provide uniform support regardless of moisture
  2. The clay should be kept saturated during casting
  3. Moisture changes can cause differential movement and panel cracking, so subgrade moisture and protection must be controlled Correct answer.
  4. The bed can be placed directly on the clay without observation

Explanation

Expansive clay changes volume as its moisture content changes, which can move the casting bed differentially and crack panels. The planning should control subgrade moisture and protect the prepared bed from wetting and drying. Uniform support cannot be assumed without observation and control.

Question 41Forming and Panel Construction

A concrete casting bed is swept clean and a bond breaker is applied before panel forms are erected. What is the main function of the bond breaker?

  1. It stops the panel from sticking to the casting bed. Correct answer.
  2. It bonds the lifting inserts to the panel.
  3. It seals the side forms against mortar loss.
  4. It speeds up the initial set of the concrete.

Explanation

A bond breaker forms a separation layer on the casting surface so the hardened panel can be lifted without sticking. It does not seal side forms, change concrete set time, or help lifting inserts develop anchorage.

Question 42Forming and Panel Construction

What is the purpose of applying a form release agent to tilt-up side forms?

  1. To increase the compressive strength of the panel edge.
  2. To prevent the forms from absorbing curing water.
  3. To keep the hardened panel from bonding to the forms. Correct answer.
  4. To make the forms easier to stake to the casting bed.

Explanation

Form release agents prevent adhesion between hardened concrete and form faces so the forms can be stripped cleanly. They are not intended to change panel strength, improve staking, or control curing-water absorption.

Question 43Forming and Panel Construction

A chamfer strip is commonly placed along the perimeter of a tilt-up form. What does it provide?

  1. A keyway for field grouting between panels.
  2. An eased edge that resists chipping and spalling. Correct answer.
  3. An anchorage pocket for lifting hardware.
  4. A recessed reveal for architectural shadow lines.

Explanation

A chamfer strip forms a beveled or eased edge that reduces chipping and spalling during lifting and handling. It is not a keyway, a reveal, or an insert pocket.

Question 44Forming and Panel Construction

Side forms for a tilt-up panel are set so that their height matches which dimension?

  1. The thickness of the casting slab
  2. The embedment depth of the lifting insert
  3. The panel length plus the joint width
  4. The specified panel thickness Correct answer.

Explanation

Tilt-up side forms define the panel perimeter and are set to the specified panel thickness, which is the vertical dimension of the form. The form height does not equal the panel length, casting-slab thickness, or insert embedment.

Question 45Forming and Panel Construction

Why should joints between side form sections be sealed or tightly fitted before concrete placement?

  1. To prevent mortar paste from leaking and forming fins. Correct answer.
  2. To allow the forms to drain water after curing.
  3. To reduce the lateral pressure of the concrete.
  4. To make the form release agent easier to spray.

Explanation

Leaking mortar paste through form joints creates fins and can leave weak, honeycombed edges. Tight fits or sealant keep the paste in place and make stripping cleaner.

Question 46Forming and Panel Construction

What is the main reason side forms are staked or braced to the casting bed?

  1. To transfer lifting loads into the casting bed.
  2. To make the panel easier to lift after curing.
  3. To keep the forms from absorbing water from the concrete.
  4. To resist movement from concrete placement. Correct answer.

Explanation

Concrete placement and fresh concrete pressure push against side forms, so stakes or braces must hold the form line and elevation. Lifting loads are carried by inserts and the crane, not by form stakes.

Question 47Forming and Panel Construction

Blockouts used to form openings in a tilt-up panel should be:

  1. coated with bond breaker on all faces after placement.
  2. securely anchored against movement during concrete placement. Correct answer.
  3. left loose so they can float upward during vibration.
  4. removed only after the panel has been erected.

Explanation

Blockouts must be fixed at the correct location and restrained against buoyancy and vibration so openings stay within tolerance. They are normally removed before the panel is lifted, not left loose or coated after placement.

Question 48Forming and Panel Construction

When can side forms normally be removed from a tilt-up panel?

  1. As soon as the concrete stops bleeding.
  2. When the concrete can resist edge damage. Correct answer.
  3. Only after the panel has reached 28-day design strength.
  4. Only after the panel has been lifted and braced.

Explanation

Side forms may be stripped once the concrete can resist damage at the edges, which is often within a day or two depending on conditions. Waiting for 28-day strength is unnecessary, and forms are removed before lifting and bracing.

Question 49Forming and Panel Construction

A rectangular panel form is checked by measuring both diagonals. The measurements differ by 1/2 inch. What does this indicate?

  1. The form is out of square and should be adjusted. Correct answer.
  2. The form is correct because diagonals always differ.
  3. The form is square but the panel is too thick.
  4. The form is too long and must be shortened.

Explanation

Equal diagonals confirm that a rectangular form is square. A difference means opposite corners are not at 90 degrees, so the form should be adjusted before casting.

Question 50Forming and Panel Construction

Which condition most favors using steel side forms instead of wood forms for a tilt-up project?

  1. The project needs only one panel with a complex curve.
  2. The casting bed is uneven and cannot be leveled.
  3. The panel contains many small embedded items.
  4. Many identical panels will be cast repeatedly. Correct answer.

Explanation

Steel forms are durable and hold their shape over many repeated uses, making them economical for repetitive panels. Curved or highly detailed panels often use flexible or wood forms, and form material does not correct an uneven casting bed.