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Key Facts: SC Bridges Exam

50 Q

Official Exam Questions

PSI SC Commercial Contractor CIB updated 5/15/2025

70%

Passing Score (35 of 50)

PSI SC Commercial Contractor CIB updated 5/15/2025

3 hours

Time Allowed

PSI SC Commercial Contractor CIB updated 5/15/2025

USD 60

PSI Exam Fee

PSI SC Commercial Contractor CIB updated 5/15/2025

Open Book

Book Policy

PSI SC Commercial Contractor CIB updated 5/15/2025

South Carolina Bridges Contractor Examination is the official CLB/PSI open-book exam: 50 questions, 70% (35 of 50), 3 hours, USD 60 (bulletin updated 5/15/2025). Official delivery is English.

Sample SC Bridges Practice Questions

Try these sample questions to review concepts for the SC Bridges exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the SCDOT 2007 Standard Specifications, what is the minimum 28-day compressive strength used to designate Class 4000 structural concrete?
A.4,000 psi
B.5,000 psi
C.6,000 psi
D.3,000 psi
Explanation: SCDOT Section 701 names concrete classes by the minimum 28-day mix-design compressive strength. Class 4000 is proportioned for 4,000 psi at 28 days and is the workhorse mix for many bridge substructure and superstructure elements unless the plans call for a higher class such as 4000S, 4000P, or 5000.
2Per SCDOT 701.2.5, air-entrained concrete is required in which of the following bridge elements regardless of the concrete class?
A.Only lean concrete used as a mud mat
B.Only mass footings below the water table
C.Only prestressed girders fabricated off-site
D.Bridge columns, bent or pier caps, decks, sidewalks, parapets, and barrier walls
Explanation: SCDOT 701.2.5 requires air-entrained concrete in all bridge columns, bent or pier caps, decks, sidewalks, parapets, barrier walls, and other structural elements on the bridge deck, regardless of class. Entrained air protects those exposed members from freeze-thaw damage.
3For most SCDOT air-entrained structural concrete that is not prestressed, the design mix is based on what target entrained-air content?
A.4.5 percent plus or minus 1.5 percent
B.8.0 percent plus or minus 2.0 percent
C.12 percent with no tolerance
D.2.0 percent plus or minus 0.5 percent
Explanation: SCDOT 701.2.5 bases the design mix for air-entrained concrete on 4.5 percent plus or minus 1.5 percent entrained air, except for prestressed concrete. That 3.0 to 6.0 percent window is the field target unless pumping changes the measurement location.
4How many cubic feet are in one cubic yard of concrete?
A.36 cubic feet
B.9 cubic feet
C.12 cubic feet
D.27 cubic feet
Explanation: A cubic yard is 3 ft × 3 ft × 3 ft = 27 cubic feet. Every bridge concrete takeoff starts by converting length × width × thickness in feet to cubic feet, then dividing by 27 to obtain cubic yards.
5What is the SCDOT maximum slump for concrete placed in a bridge deck?
A.6 inches
B.9 inches
C.12 inches
D.3 inches
Explanation: SCDOT limits bridge-deck slump to a maximum of 6 inches, even when mid-range or high-range water reducers are used. Higher slump on a deck increases the risk of segregation, excessive bleed, and finishing problems on a large exposed surface.
6According to OSHA 29 CFR 1926.701, which statement about concrete buckets is correct?
A.No employee shall be permitted to ride concrete buckets
B.Only the pump operator may ride the bucket to the deck
C.Riding is allowed below 6 feet of lift height
D.Employees may ride a concrete bucket if a personal fall-arrest system is used
Explanation: OSHA 1926.701(d) states that no employee shall be permitted to ride concrete buckets. Elevated buckets must also be routed so that the fewest employees are exposed to falling-bucket hazards. There is no fall-arrest, height, or job-title exception.
7What is the primary reason air-entraining admixtures are used in South Carolina bridge concrete?
A.To provide a system of microscopic voids that relieve freeze-thaw pressure in the paste
B.To replace the need for wet curing on decks
C.To allow unlimited addition of mix water at the jobsite
D.To increase 28-day compressive strength above the mix-design value
Explanation: Entrained air creates millions of closely spaced microscopic voids in the cement paste. When pore water freezes, the voids give the expanding ice a place to go, reducing internal pressure and freeze-thaw scaling. That durability benefit is why SCDOT requires air in exposed bridge elements.
8For SCDOT Class 4000 concrete made with crushed stone, what is the minimum cement content in the structural concrete table?
A.750 lb per cubic yard
B.494 lb per cubic yard
C.588 lb per cubic yard
D.611 lb per cubic yard
Explanation: SCDOT 701.2.12.2 lists 611 lb of cement per cubic yard as the minimum for Class 4000 with crushed stone (or gravel). That cement content, paired with a maximum water-cementitious ratio of 0.40, is what the table uses to produce a 4,000 psi mix.
9What is the SCDOT maximum water-to-cementitious-material ratio for Class 4000 concrete with crushed stone or gravel?
A.0.40
B.0.50
C.0.60
D.0.32
Explanation: The SCDOT structural concrete table caps Class 4000 at a 0.40 water-to-cementitious-material ratio for both crushed stone and gravel. A lower w/cm improves strength, permeability, and durability on bridge members.
10A bridge deck is 80 feet long, 28 feet wide, and 8 inches thick. What is the neat-line concrete volume?
A.55.3 cubic yards
B.83.0 cubic yards
C.166 cubic yards
D.41.5 cubic yards
Explanation: Convert thickness to feet: 8/12 = 0.667 ft. Volume = 80 × 28 × 0.667 = 1,493 ft³. Cubic yards = 1,493 ÷ 27 = 55.3 CY. Always convert inches to feet before dividing by 27.

About the SC Bridges Exam

The South Carolina Bridges Contractor Examination is the official CLB classification examination administered by PSI. The official exam has 50 scored questions. Passing is 70% (35 of 50) in 3 hours. The examination is open book. PSI lists USD 60 (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025). All commercial general and mechanical contractor candidates must pass the Business Management and Law for Commercial Contractor Examination in addition to this technical examination. LLR charges a separate USD 350 license application fee. This bank is an English-language MCQ study adaptation. It does not replace required trade experience, board approval, financial statements or bonds, or the official examination.

Exam sponsor: PSI Services LLC (for the South Carolina Contractor's Licensing Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.

Time Limit

3 hours

Passing Score

70% (35 of 50)

Exam / Certification Fees

USD 60

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

24%

Concrete

Concrete (12 items)

10%

Concrete - Reinforcing Steel

Concrete - Reinforcing Steel (5 items)

8%

Concrete Formwork

Concrete Formwork (4 items)

16%

Structural Steel

Structural Steel (8 items)

16%

Pile Driving/Sitework

Pile Driving/Sitework (8 items)

6%

Paving

Paving (3 items)

10%

Safety - Code of Federal Regulations

Safety - Code of Federal Regulations (5 items)

6%

Estimating

Estimating (3 items)

4%

Business – Math

Business – Math (2 items)

Preparing for the SC Bridges Exam

What You Need to Know

  • Passing score: 70% (35 of 50)
  • Assessment: Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.
  • Time limit: 3 hours
  • Exam / certification fees: USD 60 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

SC Bridges: Suggested Study Strategy

1Distribute study time to the official PSI content outline (bulletin updated 5/15/2025)
2Use only the PSI-listed references for this classification
3Temporary tabs such as Post-it notes are prohibited in the PSI center
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the South Carolina Bridges Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50) within 3 hours (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025).

How much does the SC Bridges exam cost?

PSI lists USD 60 for this examination. The South Carolina Contractor's Licensing Board charges a separate USD 350 license application fee.

Is the SC Bridges exam open book?

Yes. PSI lists the commercial contractor examinations as open book. Candidates may bring the PSI-listed references for this classification. Temporary tabs such as Post-it notes are prohibited.

Do I also need the Business Management and Law examination?

Yes. All commercial general and mechanical contractor candidates must pass the Business Management and Law for Commercial Contractor Examination in addition to this technical examination. Burglar and fire alarm candidates take the Alarm Code of Laws Examination instead.