ACI Concrete Transportation Construction Inspector (CTCI)

Which ACI publication is the primary reference package brought to the open-book ACI CTCI written and plans-reading examinations?

• ACP-1 Field Testing Technician Workbook
• BCP-21 Concrete Construction Special Inspector Reference Package
• CCP-31 Transportation Inspector Reference Package
• DSP-66 ACI Detailing Manual

Which existing ACI certification must a candidate hold (or pass within one year) to be eligible for ACI CTCI certification?

• AACI Concrete Strength Testing Technician
• BACI Concrete Field Testing Technician Grade I
• CACI Shotcrete Nozzleman
• DACI Tilt-Up Supervisor

The ACI CTCI certification is valid for how long before recertification is required?

• A3 years
• B5 years
• C7 years
• D10 years

What is the minimum passing score on each of the two CTCI examinations?

• A60%
• B65%
• C70%
• D75%

How long is the CTCI written inspection exam (the ~80-question multiple-choice portion)?

• A1 hour
• B2 hours
• C3 hours
• D4 hours

Which ASTM standard governs sampling freshly mixed concrete in the field for transportation construction acceptance testing?

• AASTM C31
• BASTM C39
• CASTM C172
• DASTM C231

According to ASTM C172, what is the maximum elapsed time from obtaining the first portion of a composite sample to its use in molding cylinders or performing field tests?

• A5 minutes
• B10 minutes
• C15 minutes
• D30 minutes

Which AASHTO test method is the equivalent of ASTM C143 slump of hydraulic-cement concrete?

• AAASHTO T 22
• BAASHTO T 23
• CAASHTO T 119
• DAASHTO T 152

Per ASTM C143, after the slump cone is lifted, the elapsed time from starting to fill the cone to measuring slump must not exceed:

• A1 minute 30 seconds
• B2 minutes 30 seconds
• C5 minutes
• D10 minutes

ASTM C143 specifies how many layers must be placed in the slump cone, and how many rod strokes per layer?

• A2 layers, 15 strokes each
• B3 layers, 25 strokes each
• C4 layers, 20 strokes each
• D1 single layer, 50 strokes

Which ASTM standard covers the pressure method for air content of freshly mixed concrete?

• AASTM C173
• BASTM C231
• CASTM C138
• DASTM C1064

ASTM C231 is NOT suitable for concrete made with which type of aggregate?

• ACrushed limestone
• BNatural sand and gravel
• CLightweight (porous) aggregate
• DManufactured sand

Which ASTM standard covers density (unit weight), yield, and gravimetric air content of freshly mixed concrete?

• AASTM C39
• BASTM C138
• CASTM C231
• DASTM C1064

When making standard 6 x 12 in. cylinders per ASTM C31, how many layers should be placed, and how many rod strokes per layer?

• A2 layers, 25 strokes each
• B3 layers, 25 strokes each
• C4 layers, 25 strokes each
• D3 layers, 30 strokes each

When making 4 x 8 in. cylinders per ASTM C31, how many layers and how many rod strokes per layer are required?

• A2 layers, 25 strokes each
• B3 layers, 25 strokes each
• C2 layers, 15 strokes each
• D1 layer, 50 strokes

Per ASTM C31, initial curing of standard-cured cylinders must be at what temperature range?

• A40 to 60 degrees F
• B60 to 80 degrees F
• C70 to 90 degrees F (for high-strength: 68 to 78 degrees F)
• D32 to 70 degrees F

Which ASTM method covers measuring the temperature of freshly mixed hydraulic-cement concrete?

• AASTM C1064
• BASTM C138
• CASTM C231
• DASTM C172

Per ASTM C1064, the temperature sensor must be embedded in the concrete by a minimum depth of:

• A1 inch
• B2 inches
• C3 inches
• D6 inches

Per ASTM C94, ready-mixed concrete must generally be discharged on the job site within how many minutes after the introduction of cement to the aggregates?

• A30 minutes
• B60 minutes
• C90 minutes
• D120 minutes

Per ASTM C94, the maximum number of drum revolutions allowed between introduction of cement and discharge of concrete is:

• A150
• B200
• C300
• D500

After initial mixing at a batch plant, ASTM C94 requires how many minimum revolutions at mixing speed before discharging in a truck mixer?

• A30
• B70 to 100
• C150 to 200
• D300

A ready-mix truck arrives on a bridge deck with a slump of 3 in.; the specification requires 5 in. The contractor wants to add water on site. According to ASTM C94, water may be added one time, provided:

• AThe maximum water-cementitious ratio is not exceeded and 30 additional revolutions at mix…
• BThe water-cementitious ratio may be exceeded if needed to reach slump
• CWater can be added unlimited times until slump is met
• DWater may be added only at the batch plant and never on the job site

Which ASTM standard governs compressive strength testing of cylindrical concrete specimens?

• AASTM C39
• BASTM C42
• CASTM C78
• DASTM C293

Per ACI 318 and ACI 301, a strength test result for acceptance is defined as:

• AThe result of a single cylinder broken at 28 days
• BThe average compressive strength of at least two 6 x 12 in. cylinders (or three 4 x 8 in.…
• CThe lowest of three cylinders cast from the same load
• DThe 7-day strength extrapolated to 28 days

ACI 318/301 acceptance of concrete strength requires both: (1) every arithmetic average of any three consecutive strength tests is at least f'c, AND (2) no individual strength test is more than:

• A100 psi below f'c for f'c ≤ 5000 psi (or 0.10 f'c for f'c > 5000 psi)
• B500 psi below f'c
• C1000 psi below f'c
• DAny value as long as the average is met

ACI 318 requires that, when an individual strength test result falls below f'c by more than the allowable amount, investigation may include drilling cores. Per ACI 318, the concrete is considered structurally adequate if:

• AThe average of three cores equals at least 85% of f'c, and no single core is less than 75…
• BThe average of three cores equals at least 100% of f'c
• CAny single core meets f'c
• DAll cores are exactly equal to f'c

Per ASTM C31, when standard-cured (laboratory-cured) cylinders are used for acceptance testing, they must be transported to the laboratory within how many hours after molding?

• A8 hours
• B24 hours
• C48 hours
• D72 hours

Which AASHTO M specification covers Portland cement (the standard a DOT typically cites for cement acceptance)?

• AAASHTO M 80
• BAASHTO M 85
• CAASHTO M 154
• DAASHTO M 194

Which ASTM standard governs chemical admixtures for concrete (such as water-reducers, retarders, and accelerators)?

• AASTM C150
• BASTM C260
• CASTM C494
• DASTM C618

Which ASTM standard specifically covers air-entraining admixtures for concrete?

• AASTM C260
• BASTM C494
• CASTM C1017
• DASTM C618

ASTM C33 covers concrete aggregates. The maximum nominal size of coarse aggregate for a bridge deck is typically governed by which of the following?

• AThe grade of cement used
• BThe slump specified
• CClear spacing between reinforcing bars, clear cover, and 1/5 the narrowest dimension of t…
• DThe temperature of the concrete

Per ACI 301, water used in mixing concrete must meet which standard?

• AASTM C39
• BASTM C1602
• CASTM C150
• DASTM C231

Per ACI 301, the inspector verifies the slump tolerance on the truck ticket. If the spec calls for a slump of 5 in. with a tolerance of ±1 in., a slump of 6.5 in. would be:

• AAcceptable because it is close enough
• BAcceptable because high slump improves placement
• CNot acceptable; the load must be rejected or adjusted before discharge
• DAcceptable if cylinders are still cast

Per ACI 117 tolerances, the cross-sectional dimension of a column may vary from the specified by approximately:

• A+3/8 in., -1/4 in.
• BPlus or minus 1 in.
• CPlus or minus 2 in.
• DNo tolerance is given

Per ACI 301, when may formwork supporting the weight of concrete and construction loads be removed?

• AWhen the concrete reaches age 24 hours
• BWhen the concrete has attained sufficient strength to support its own weight and superimp…
• CWhenever the contractor decides
• DWhen the concrete has reached 50% of f'c regardless of element type

Falsework supporting a bridge superstructure must be designed for which loads?

• AOnly dead load of the concrete
• BDead load, live construction load, vertical and lateral construction loads, and prescribe…
• COnly the weight of the workers
• DHalf the dead load with an arbitrary safety factor

Which CRSI publication is the primary reference for fabrication and placement of reinforcing steel and is included in the CP-31 package?

• ACRSI Design Handbook
• BCRSI Manual of Standard Practice
• CCRSI Detailing Manual
• DCRSI Field Handbook

Reinforcing bars are identified in the field by markings rolled into the bar. The CRSI MSP requires the markings to identify which of the following?

• AProducer mill, bar size, type of steel, and grade
• BOnly the bar size
• CThe date the bar was rolled
• DThe supplier and the project number

Per ACI 318, for cast-in-place concrete exposed to earth but not formed (such as drilled shafts cast against earth), the minimum clear cover for reinforcement is:

• A1 in.
• B1.5 in.
• C2 in.
• D3 in.

Per ACI 318, for formed surfaces exposed to earth or weather (such as bridge piers), the minimum clear cover for #6 reinforcing bars and larger is:

• A1 in.
• B1.5 in.
• C2 in.
• D3 in.

An epoxy-coated reinforcing bar (ECR) is delivered to the job site with a small coating defect approximately 1/4 in. in diameter. According to typical DOT and ACI/CRSI practice, the inspector should:

• AReject the bar; epoxy must be perfect
• BAllow placement only after the defect is patched with a compatible 2-part epoxy patching…
• CAllow placement without repair
• DDirect the contractor to remove and replace all the coating

When inspecting reinforcement placement before a bridge deck pour, the inspector should check all of the following EXCEPT:

• ABar size, spacing, and clear cover
• BLap splice length and stagger
• CThe bar supplier's accounting invoice
• DTying and support to prevent displacement during placement

Post-tensioning ducts in a cast-in-place bridge superstructure must be inspected before concrete placement. Which of the following is the LEAST critical inspection item?

• ADuct profile matches the plans
• BDuct is leak-tight at couplings
• CColor of the duct exterior
• DAnchorage zones have proper reinforcement

Per ACI 306 cold-weather concreting recommendations, cold weather begins when the air temperature is below 40 degrees F for more than half of any consecutive 24-hour period, OR when the air temperature is below ___ degrees F at any time during the 24-hour period.

• A32
• B40
• C50
• D60

Per ACI 306, the minimum temperature of concrete as placed for sections less than 12 in. thick in cold weather should be approximately:

• A40 degrees F
• B50 degrees F
• C55 degrees F
• D65 degrees F

Per ACI 305 hot-weather concreting, the maximum recommended fresh concrete temperature at placement for typical transportation applications is generally:

• A70 degrees F
• B80 degrees F
• C90 degrees F
• D100 degrees F

Plastic shrinkage cracks in a bridge deck typically form when the evaporation rate from the concrete surface exceeds the bleeding rate. The ACI 305 nomograph identifies a threshold evaporation rate of approximately:

• A0.05 lb/sq ft/hr
• B0.10 lb/sq ft/hr
• C0.20 lb/sq ft/hr
• D0.50 lb/sq ft/hr