Appendix 3-3

January 29, 2016

 

PCC Structures Verification Responsibilities

Duty

Task

Performed By/
Required Cert.

Minimum Frequency

1.  Sample and test aggregate gradations (Fine, Coarse, and Intermediate)

•Obtain independent sample per Materials IM 301.
•Test per Materials IM 302 and 306.

Construction
Sampling AGG I
Testing - AGG II

Sample 1st day & 1/week
Test 1st day & 20% of samples
S & T 1/deck pour

2.  Verify aggregate quality.

•Obtain independent sample and submit to Central Materials (Coarse and Intermediate).

Sampling - District Materials       AGG II

Ready Mix/Central Batch
1/1000 cubic yards             

Testing - Office of Materials

Mobile Mixer - 1/project

3.  Verify cementitious.

•Obtain independent sample and submit to Central Materials (Portland Cement and Ground Granulated Blast Furnace Slag).

Sampling - District Materials
PCC II

1/1000 cubic yards

Testing - Office of Materials

4.  Verify admixtures.

•Obtain independent samples and submit to Central Materials.

Sampling - District Materials
PCC II

1/producers lot

Testing - Office of Materials

5.  Verify air, Plastic

•Sample per Materials IM 327.
•Test per Materials IM 318.

Construction
PCC I

Ready Mix/Central Batch
1/30 cubic yards

Mobile Mixer - 1/100 square yards

6.  Verify slump

•Sample per Materials IM 327.
•Test per Materials IM 317.

Construction
PCC I

Ready Mix/Central Batch
1/30 cubic yards

Mobile Mixer - 1/project

7.  Verify reinforcement.

•Obtain independent samples and submit to Central Materials.

Sampling - District Materials
PCC II

Varies - Check IM 204

Testing - Central Materials

8.  Verify smoothness.

•Randomly select segments and measure smoothness per Materials IM 341.
•Report results and compare to contractor's results.
•Check tolerance per IM 216.

District Materials
PROF

10% of project

 

PCC Structures Independent Assurance Responsibilities

Duty

Task

Performed By/
Required Cert

Minimum Frequency

Ready Mix

Mobile Mixer/Central Batch

1.  Sample and test aggregate gradations (Fine, Coarse, and Intermediate)

•Sample and test per Materials IM 204.
•Check tolerance per IM 216.

District Materials
AGG II

*1/1000 cubic yards

Mobile Mixer   N/A

*Central Batch 1/1000 cubic yards

2.  Entrained Air, Plastic

•Sample and test per Materials IM 204.
•Check tolerance per IM 216.

District Materials
PCC I

*1/1000 cubic yards

*1/1000 cubic yards

3.  Slump

•Sample and test per Materials IM 204.
•Check tolerance per IM 216.

District Materials
PCC I

*1/1000 cubic yards

*1/1000 cubic yards

4.  Calibrate smoothness testing equipment

•Per Materials IM 341.

Office of Materials

Yearly

Yearly

* Systems Approach Applicable

 

Other Required PCC Structures Acceptance Process Responsibilities

Duty

Task

Performed By/
Required Cert.

Miniumum Frequency

1. Inspect stockpiles

•Observe stockpiling procedures.
•Check for segregation.
•Check for contamination. 
•Check for degradation.
•Check for proper storage and handling of aggregates per Article 2301.02, C and Materials IM 527.

Construction
AGG II

Observe during startup and during visits

2. Concrete Grade Yield

•Compare quantity required to quantity batched and placed.

Construction
PCC II

N/A

3.  Flexural Strength (beams) Curing and Testing

•Cast and cure per Materials IM 328.
•Test per Materials IM 316.

Construction
PCC I

Perform test each occurrence

4.  Maturity Curve Development and Validation

•Observe maturity curve development per Materials IM 383.
•Observe casting and curing of beams.
•Observe testing of beams.
•Observe maturity meter readings at time of beam breaks.
•Review Maturity - Strength Development MOR - CPL form.

•Review Maturity - Field Data form.
•Review Validation of Maturity Curve form.

Construction/PCC I



District Materials Engr.

Construction/PCC I
District Materials Engr.

When available



Review each curve for each mix.
Review each form.
Review each validation.

5.  Field Maturity Testing

•Observe placement of maturity probes per Materials IM 383.
•Observe contractor maturity meter readings

Construction
PCC I

Observe readings from continuous monitoring device once per project.

6.  Test Equipment

•Inspect test equipment to ensure in good working order and lab has been qualified.

Construction
PCC I & AGG II

During startup and Wwhen problems arise

7.  Audit Checks and Test results in Plant Book

•Check for proper completion of Daily Plant Checklist and Plant Site Inspection List.
•Observe record of test results for moistures and specific gravities.

Construction
PCC II

Weekly

8.  Material certifications

Check certifications for:
•Cement
•Fly Ash
•GGBFS (Slag)
•Aggregates
•Admixtures

Construction
PCC II

During visits

9.  Observe aggregate moisture and specific gravity testing

•Observe CPI perform test in accordance with Materials IM 307 and IM 308.

Construction
PCC II

1/project

10.  Plant proportion control

•Observe delivery tolerance.
•Observe scale sensitivity.
•Observe admixture dispenser operation.
•Check for proper batch proportions on computer generated or hand written batch tickets

Construction
PCC II

Once during first week of production

11.  Observe mix times and number of revolutions

•Per Article 2001.21.

Construction
PCC II

Once per pour

12.  Audit Daily Diary

•Review for proper recording of events.

Construction
PCC II

During visits

13.  Plant Reports

•Check for proper project and mix identification.
•Check for dates and report number.
•Review batch weights and aggregate gradations.
•Check materials brands and sources.
•Check for correct concrete and cement totals (daily, weekly, and to date).
•Check for appropriate Plant Inspector signature or initials.
•Sign report after review.
•Check for hard copy or electronic backup of files

Construction
PCC II

Weekly

14.  Inspect Transit Mixers

•Inspect for buildup in drum per Article 2001.21 B.
•Inspect for fin wear or broken fins per Article 2001.21 B.
•Check for current truck certification per Article 2001.21 B.

Construction
PCC II

1/Month

15.  Inspect plant facility

•Observe plant calibration to assure compliance with Materials IM 527
•Check lab qualifications. 
•Inspect test equipment.

District Materials
PCC II

Central Batch/ Mobile Mixer - Beginning of project
Ready Mix - Yearly