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What defines self-consolidating concrete (SCC) according to ACI 237R?

Highly flowable, non-segregating concrete that can spread into place, fill formwork, and encapsulate reinforcement without mechanical consolidation

Concrete with a slump of 8 inches or greater measured per ASTM C143

Concrete containing at least 10% supplementary cementitious materials

High-strength concrete with compressive strength greater than 8,000 psi

to track

2026 Statistics

Key Facts: ACI SCC Testing Exam

5 ASTM

SCC Test Standards

ACI SCC Certification Program

~50

Written Exam Questions

ACI Certification Policies

1 hour

Written Exam Time

ACI Certification Policies

70%

Overall Written Exam Passing Score

ACI Certification Policies

60%

Minimum per ASTM Method Section

ACI Certification Policies

5 years

Certification Validity Period

ACI Certification Policies

ACI lists the SCC Testing Technician written exam as a 1-hour, closed-book, approximately 50-question multiple-choice exam paired with a hands-on performance exam. Candidates must already hold a current ACI Concrete Field Testing Technician Grade I certification. Chapter fees are typically $470 (member) to $530 (non-member) per exam. Certification is valid for 5 years and renewed by re-examination.

Sample ACI SCC Testing Practice Questions

Try these sample questions to test your ACI SCC Testing exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What defines self-consolidating concrete (SCC) according to ACI 237R?

A.Highly flowable, non-segregating concrete that can spread into place, fill formwork, and encapsulate reinforcement without mechanical consolidation

B.Concrete with a slump of 8 inches or greater measured per ASTM C143

C.Concrete containing at least 10% supplementary cementitious materials

D.High-strength concrete with compressive strength greater than 8,000 psi

Explanation: ACI 237R defines SCC as highly flowable, non-segregating concrete that can spread into place, fill formwork, and encapsulate reinforcement without any mechanical consolidation (no rodding, tamping, or vibration). Standard slump per C143 is not used for SCC — slump flow per ASTM C1611 is the governing workability test.

2Which ASTM standard covers the slump flow test for self-consolidating concrete?

A.ASTM C1611/C1611M

B.ASTM C143/C143M

C.ASTM C1621/C1621M

D.ASTM C1610/C1610M

Explanation: ASTM C1611/C1611M is the Standard Test Method for Slump Flow of Self-Consolidating Concrete. It measures the final spread diameter of a concrete patty after the slump cone is raised, and optionally the T50 time and visual stability index (VSI).

3When performing the slump flow test per ASTM C1611, the final spread is calculated as:

A.The average of two diameters measured approximately perpendicular to each other, to the nearest 1/2 in.

B.The maximum diameter measured in any direction

C.The diameter measured parallel to the longest axis of the spread

D.The circumference of the spread divided by pi

Explanation: Per ASTM C1611, the slump flow is the average of two diameters measured approximately perpendicular to each other after flow has stopped. Measurements are recorded to the nearest 1/2 in. (10 mm). Using only the maximum diameter would not represent the average spread.

4A typical target slump flow range for most SCC applications per ACI 237R is:

A.18 to 30 in. (455 to 760 mm)

B.4 to 8 in. (100 to 200 mm)

C.8 to 12 in. (200 to 300 mm)

D.32 to 40 in. (815 to 1015 mm)

Explanation: ACI 237R notes that slump flow for SCC typically ranges from 18 to 30 in. (455 to 760 mm) depending on the application. A 4-8 in. slump would still be conventional concrete, and slump flows greater than about 30 in. generally indicate excessive flowability and segregation risk.

5During the slump flow test, the T50 time is:

A.The time, to the nearest 0.2 s, from first movement until the concrete spread first touches the 500-mm (20-in.) circle

B.The total time from raising the mold until flow stops

C.The time for concrete to drop 50 mm inside the slump cone

D.The time required to fill the slump cone

Explanation: Per ASTM C1611, T50 (also called T500 in metric) is the time measured from when the mold is first raised until the concrete first touches the 500-mm (20-in.) circle marked on the base plate. It is recorded to the nearest 0.2 s and is an indicator of viscosity.

6A high T50 value (for example, 6 seconds) for SCC generally indicates:

A.Higher plastic viscosity / slower flow, which may be desirable where segregation resistance is critical

B.Low plastic viscosity and likely segregation

C.Incorrect cone orientation during testing

D.Low yield stress and poor filling ability

Explanation: A higher T50 time reflects greater plastic viscosity and slower flow. Higher viscosity mixes resist segregation and dynamic segregation during placement but may be harder to pump. Lower T50 values indicate lower viscosity — rapid flow — which may provide better filling but with greater segregation risk.

7In the slump flow test per ASTM C1611, the slump cone may be oriented:

A.Either in the upright position (like conventional slump) or in the inverted position, at the technician's option

B.Only in the upright position, same as ASTM C143

C.Only in the inverted position

D.On its side

Explanation: ASTM C1611 allows the slump cone to be used either upright (Procedure A) or inverted (Procedure B). Both are valid for measuring slump flow of SCC. The inverted position is often preferred because it does not require consolidation while filling.

8When performing the C1611 test, consolidation of the SCC in the slump cone is:

A.Not permitted — the cone is filled in one continuous lift without rodding, tapping, or vibrating

B.Required — 25 strokes per layer in three equal lifts

C.Required — 15 strokes per lift with a 5/8-in. tamping rod

D.Optional, at the technician's discretion

Explanation: One of the fundamental principles of SCC is that it consolidates under its own weight. ASTM C1611 explicitly prohibits rodding, tapping, or vibrating during cone filling. Consolidating SCC would bias the flow behavior and defeat the purpose of the test.

9Before performing the slump flow test, the base plate and inside of the slump cone should be:

A.Dampened with a wet cloth so the surfaces are moist but not pooling with water

B.Left completely dry to measure true flow

C.Coated with form release agent

D.Covered with plastic sheeting

Explanation: ASTM C1611 requires the base plate and cone to be dampened (moistened) before each test. Dry surfaces can absorb water from the mix or create friction that distorts the flow; pooling water lubricates the mix artificially. A damp but non-pooled surface provides the standard condition.

10Per ASTM C1611, the difference between the two diameter measurements during the slump flow test must not exceed:

A.2 in. (50 mm); if exceeded, the test is invalid and must be repeated

B.1/2 in. (13 mm); if exceeded, the test is valid but must be noted

C.4 in. (100 mm); if exceeded, the test is invalid

D.No limit — only the average matters

Explanation: ASTM C1611 specifies that if the difference between the two perpendicular diameter measurements is greater than 2 in. (50 mm), the test is considered invalid and shall be repeated. A large difference indicates irregular (non-circular) flow, which usually reflects segregation or an inclined base.

About the ACI SCC Testing Exam

The ACI Self-Consolidating Concrete (SCC) Testing Technician credential certifies individuals who perform specialized fresh-concrete tests on self-consolidating concrete per ASTM C1610 (static segregation column), C1611 (slump flow), C1621 (J-Ring passing ability), C1712 (rapid segregation penetration), and C1758 (fabricating SCC specimens). SCC flows into formwork and around reinforcement without vibration, so these tests replace or supplement the conventional slump and consolidation procedures used for normal concrete.

Assessment

Written (~50 MC, 1 hour, closed-book) + Performance (hands-on)

Time Limit

1 hour (written) + performance exam

Passing Score

60% on each ASTM method AND 70% overall on written; pass performance exam

Exam Fee

$470 member / $530 non-member per exam (chapter-administered; fees vary) (American Concrete Institute (ACI))

ACI SCC Testing Exam Content Outline

20%

ASTM C1611 — Slump Flow of SCC

Slump flow diameter, T50 time, Visual Stability Index (VSI 0-3), Procedure A (upright) vs B (inverted) cone, base plate requirements, cone lift procedure, and acceptance criteria

20%

ASTM C1621 — Passing Ability by J-Ring

J-Ring setup (16 vertical bars, 12-in. ring), J-Ring flow measurement, slump-flow vs J-Ring difference interpretation, blocking step, and acceptance criteria (≤1 in. no blocking; >2 in. noticeable blocking)

20%

ASTM C1610 — Static Segregation (Column Test)

Column apparatus (3 sections, 8-in. dia × 26-in. tall), 15-minute rest period, top/bottom sample wash-sieving on No. 4 sieve, coarse aggregate weighing, and segregation index calculation (typical ≤15% acceptable)

20%

ASTM C1712 — Rapid Segregation Penetration Test

Penetration apparatus (80-mm hollow cylinder with 45° beveled edge), 30-second penetration depth measurement in inverted slump cone, interpretation of results (≤10 mm stable; >25 mm unstable)

20%

ASTM C1758 & SCC Fundamentals

Fabricating SCC specimens without rodding/tapping/vibration (differs from C31), ACI 237R workability concepts (filling ability, passing ability, stability), HRWR and VMA admixtures, mix design principles, and formwork pressure considerations

How to Pass the ACI SCC Testing Exam

What You Need to Know

Passing score: 60% on each ASTM method AND 70% overall on written; pass performance exam
Assessment: Written (~50 MC, 1 hour, closed-book) + Performance (hands-on)
Time limit: 1 hour (written) + performance exam
Exam fee: $470 member / $530 non-member per exam (chapter-administered; fees vary)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ACI SCC Testing Study Tips from Top Performers

1Memorize the five ASTM standards (C1610, C1611, C1621, C1712, C1758) and what each one measures — the written exam is organized by these methods

2Master the VSI 0-3 scale for slump flow stability rating — know the visual indicators (mortar halo, aggregate pile, bleed water) for each level

3Know the J-Ring blocking acceptance criteria: 0-1 in. difference = no blocking, 1-2 in. = minimal/noticeable, >2 in. = noticeable/extreme blocking

4Understand the ASTM C1610 segregation formula S = 2 × (CA_bottom - CA_top) / (CA_bottom + CA_top) × 100 and know the typical ≤15% acceptance limit

5Remember SCC is NEVER rodded, tapped, or vibrated during any test — this is the fundamental difference from conventional concrete testing per C143/C31

6Review ACI 237R for SCC workability concepts: filling ability, passing ability, and segregation resistance (stability) are the three core properties

Frequently Asked Questions

What is the ACI Self-Consolidating Concrete Testing Technician certification?

The ACI SCC Testing Technician credential certifies technicians to perform specialized fresh-concrete tests on self-consolidating concrete per five ASTM standards: C1610 (column segregation), C1611 (slump flow), C1621 (J-Ring passing ability), C1712 (rapid penetration segregation test), and C1758 (specimen fabrication without consolidation). It is an ACI field concrete testing certification.

What are the prerequisites for the ACI SCC Testing Technician exam?

Candidates must hold a current ACI Concrete Field Testing Technician — Grade I certification. Grade I covers the basic fresh-concrete tests (ASTM C31, C138, C143, C172, C173/C231, C1064) and is a required foundation before specializing in SCC testing.

How is the ACI SCC Testing Technician exam structured?

The certification requires passing both a written exam and a performance (hands-on) exam. The written exam is approximately 1 hour, closed-book, with about 50 multiple-choice questions distributed across the five ASTM test methods (roughly 6-12 questions per method). The performance exam requires the candidate to demonstrate or correctly describe each ASTM test procedure to an ACI-approved examiner.

What is the passing score for the ACI SCC Testing Technician exam?

Candidates must achieve a minimum of 60% correct on EACH individual ASTM test method section AND a minimum overall score of 70% on the written exam. Both thresholds must be met to pass the written exam. The performance exam is scored separately and must also be passed.

How much does the ACI SCC Testing Technician exam cost in 2026?

Exam fees are administered by ACI chapters and vary by location. Typical fees are approximately $470 for ACI members and $530 for non-members per exam, based on published ACI chapter pricing. Some chapters charge separate fees for the written and performance exams, and additional examiner or workshop fees may apply. Contact your local ACI chapter for exact current pricing.

How long is the ACI SCC Testing Technician certification valid?

The certification is valid for 5 years. Recertification requires passing both the written and performance exams again — continuing education credits alone do not extend this certification. Candidates should plan to re-certify before their expiration date to avoid a lapse.

What ASTM standards does the ACI SCC Testing Technician exam cover?

The exam covers five SCC-specific ASTM standards: ASTM C1610 (Static Segregation by Column Technique), ASTM C1611 (Slump Flow of Self-Consolidating Concrete), ASTM C1621 (Passing Ability by J-Ring), ASTM C1712 (Rapid Assessment of Static Segregation), and ASTM C1758 (Fabricating Test Specimens with SCC). Working knowledge of ACI 237R and ASTM C172 is also expected.