Information
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Audit Title
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Conducted on
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Prepared by
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Business Unit Manager
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Operations Executive
1. Quality Control
1.1 Summary of Concrete Related Records
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Equipment Calibration Records (QP 7.6.4)
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Yearly Inspection of Cube Moulds (YQC 4)
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Monthly Checking of Thermometers (MQC 2)
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Monthly Water Meter Check (MQC 12)
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Checking of Mass Meters (WQC 1)
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Weekly Admixture Check (WQC 2)
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Aggregate Grading Analysis (WQC 3 & 4)
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Aggregate gradings meeting the required specification.
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Fineness Modulus Tracking (WQC 5)
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SCC Viscosity Check (WQC 6)
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Cube and Slump Test Results (DQC 1)
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Cube results meet the required specification
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Moisture Control (GPC 4)
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Steam Temperature Control (GPC 6)
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Acid Insolubility Test Result (GPC 9)
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6 month bases
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Curing Bath Temperature Record Sheet (GPC 7b)
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Bought in Cementitious Material Inspection (SQC 1)
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Bought in Aggregate Inspection (Visual)
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Cube Failure Checklist (SQC 21)
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Only required if cubes failed
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Additional Observations
1.2 Testing of Aggregate
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Sampling done in accordance with SWI 7.4.3-01
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Sieve analysis done in accordance with SWI 7.4.3-01
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Sieves are clean and in good working condition (SWI 7.6-09)
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Additional Observations
1.3 Testing of Hardened Concrete
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Cube specimens are being crushed on a non floated surface
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Cube specimens are tested at the correct load rate
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Load rate range 0.3MPa/s +- 0.1 (SANS 5863:2006) new is 0.6mpa/s +-0.2mpa
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Cube specimens are free from any severe defects
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Cube specimens are the correct dimension and shape (5 random cubes were selected)<br>
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Dimensions: 90-110mm & 1mm between each face. Perpen. 0.5mm;
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Cube moulds are cleaned, oiled and stored neatly
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Additional Observations
2. RS Production
2.1 Batching and Mixing
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Cross-contamination of aggregate between adjacent storage bins
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Contamination of aggregate from underlying soil
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Contamination of aggregate from organic matter (such as leaves and twigs)
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Water in the hopper pit is minimised
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Adequate drainage in and around aggregate storage bins
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Identification of cementitious storage (silo) are in place
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Identification of aggregate bins are in place
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Comments
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Photo/s of Housekeeping
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All the control boxes are locked and correctly labelled
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Side = 5 mm, Bottom = 10 mm max.
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Side scraper is the correct distance from the mixer side wall
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Ask for the tool used to test these distances
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Side scraper is clean and in good working condition?
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Mixer arms are the correct distance from the mixer floor
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Mixer arms are clean and in good working condition?
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Mixer door (gate) is sealing correctly (no loss of fines)
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All mix designs in use are the latest revision and have been approved
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Mixer operator has made a moisture adjustment
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Look to see if any signs of moisture adjustment has been made and ask why not?
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Materials are being batched accurately (SWI 7.5.1-02).
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10kg for cement and stone, 5kg for sand and fly ash, SANS = 2% cementitous and 3% for aggregate
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Admixture dispenser is dosing accurately (Max 5%)
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Water, admixture, and cementitious valves and gates are functioning properly
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Concrete mix is homogeneous before being discharge from the mixer
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Significant spillage during the discharge process
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Segregation of the mix during discharge
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Additional Observations
2.2 Sampling and Testing of Concrete
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Concrete has been sampled in accordance with SWI 7.5.1-09
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Slump/Flow test has been done in accordance with SWI 7.5.1-09
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Correct procedures being done when the slump falls outside the specified limits
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Cube specimens have been made in accordance with SWI 7.5.1-09
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Additional Observations
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Add media
2.3 Casting and Finishing
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Segregation of the mix during transport
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Significant spillage during the transport process
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Segregation of the mix during casting
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Significant spillage during the cast process
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Concrete has be effectively compacted
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Products are floated/striked off after casting
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Products are finished off after floating
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Excess concrete cleaned off the moulds after casting
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Products were protected immediately after floating
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Additional Observations
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Add media
2.4 Curing
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Pre-steam time was at least 30 minutes after casting
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Actual time recorded was
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Has the steam been utilised correctly
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Curing temperature measure correctly
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Products allowed to cool-down for 30 minutes prior to stripping
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Additional Observations
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Add media
2.5 Product Quality
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Defects not impairing the functional use or expected life of a
precast concrete product shall be considered minor defects.
Minor defects may be repaired by any method that does not
impair the product. -
Honeycombing on products
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Severity of honeycombing
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Refer to SWI 7.5.1/08 for repairing concrete products
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Blowholes on products
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Severity of blowholes
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Less than 5 mm deep in isolated areas will be acceptable. Blowholes should not affect the sealing of rubber ring joints.
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Bleeding on products
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Severity of bleeding
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Refer to SWI 7.5.1/08 for repairing concrete products. Sand streaks shall not be accepted.
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Cracking on products
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Refer to SWI 7.5.1/08 for repairing concrete products
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Overall Quality of Repair Work
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Comments on Repair Work
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Photos of Repair Work
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Handling and stripping damage
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Additional Observations
3. Culverts Production
3.1 Batching and Mixing
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Cross-contamination of aggregate between adjacent storage bins
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Contamination of aggregate from underlying soil
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Contamination of aggregate from organic matter (such as leaves and twigs)
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Water in the hopper pit is minimised
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Adequate drainage in and around aggregate storage bins
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Identification of cementitious storage (silo) are in place
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Identification of aggregate bins are in place
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Comments
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Photo/s of Housekeeping
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All the control boxes are locked and correctly labelled
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Side = 5 mm, Bottom = 10 mm max.
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Side scraper is the correct distance from the mixer side wall
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Ask for the tool used to test these distances
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Side scraper is clean and in good working condition?
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Mixer arms are the correct distance from the mixer floor
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Mixer arms are clean and in good working condition?
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Mixer door (gate) is sealing correctly (no loss of fines)
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All mix designs in use are the latest revision and have been approved
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Mixer operator has made a moisture adjustment
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Look to see if any signs of moisture adjustment has been made and ask why not?
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Materials are being batched accurately (SWI 7.5.1-02).
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10kg for cement and stone, 5kg for sand and fly ash, SANS = 2% cementitous and 3% for aggregate
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Admixture dispenser is dosing accurately (Max 5%)
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Water, admixture, and cementitious valves and gates are functioning properly
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Concrete mix is homogeneous before being discharge from the mixer
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Significant spillage during the discharge process
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Segregation of the mix during discharge
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Additional Observations
3.2 Sampling and Testing of Concrete
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Concrete has been sampled in accordance with SWI 7.5.1-09
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Slump/Flow test has been done in accordance with SWI 7.5.1-09
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Correct procedures being done when the slump falls outside the specified limits
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Cube specimens have been made in accordance with SWI 7.5.1-09
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Additional Observations
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Add media
3.3 Casting and Finishing
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Segregation of the mix during transport
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Significant spillage during the transport process
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Segregation of the mix during casting
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Significant spillage during the cast process
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Concrete has be effectively compacted
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Products are floated/striked off after casting
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Products are finished off after floating
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Excess concrete cleaned off the moulds after casting
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Products were protected immediately after floating
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Additional Observations
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Add media
3.4 Curing
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Pre-steam time was at least 30 minutes after casting
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Actual time recorded was
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Has the steam been utilised correctly
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Curing temperature measure correctly
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Products allowed to cool-down for 30 minutes prior to stripping
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Additional Observations
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Add media
3.5 Product Quality
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Defects not impairing the functional use or expected life of a
precast concrete product shall be considered minor defects.
Minor defects may be repaired by any method that does not
impair the product. -
Honeycombing on products
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Severity of honeycombing
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Refer to SWI 7.5.1/08 for repairing concrete products
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Blowholes on products
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Severity of blowholes
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Less than 5 mm deep in isolated areas will be acceptable. Blowholes should not affect the sealing of rubber ring joints.
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Bleeding on products
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Severity of bleeding
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Refer to SWI 7.5.1/08 for repairing concrete products. Sand streaks shall not be accepted.
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Cracking on products
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Refer to SWI 7.5.1/08 for repairing concrete products
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Overall Quality of Repair Work
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Comments on Repair Work
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Photos of Repair Work
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Handling and stripping damage
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Additional Observations
4. Sign Off and Summary
4.1 Sign Off
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Auditor
