PCI Plant Quality flashcards
PCI Plant Quality · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- PCI plant certification
- An audit-based certification of a precast plant's quality management system, covering documented procedures, records, testing, and product-specific requirements rather than certifying individual members.
- Corrective action closure
- A corrective action is closed only after root cause is identified and the implemented fix is verified effective; containment alone does not satisfy closure.
- Document control
- The system ensuring only current approved procedures and drawings are used, with obsolete documents removed from points of use and changes recorded.
- Internal audit independence
- Internal quality audits are performed on a planned schedule by personnel who do not have direct responsibility for the activity being audited.
- Calibration traceability
- Scales, load cells, pressure gauges, and test equipment must be calibrated against standards traceable to a national metrology institute, with records retained.
- Free moisture
- The water in an aggregate above the saturated-surface-dry condition; only free moisture adds to the effective mixing water and must be subtracted from batch water.
- Nominal maximum aggregate size
- The largest sieve on which the specified percentage of coarse aggregate is retained; it limits section depth and reinforcement spacing for proper placement.
- Admixture dispensing record
- Each batch record must show admixture type, dose, and time; a failed or partial dose stops the batch and triggers nonconformance review.
- Strand storage protection
- Prestressing strand is stored off the ground, protected from corrosion and mechanical damage, and traceable by lot to mill certificates.
- Water-cementitious ratio
- Total water divided by total cementitious material by weight; it controls strength and durability and is not inferred from slump.
- Absolute volume method
- A mixture proportioning method in which the volumes of cement, water, air, and aggregates sum to one cubic meter or cubic yard.
- Batch yield
- Total batch weight divided by measured fresh unit weight; deviation outside tolerance indicates a batching or aggregate moisture error.
- Mixer uniformity test
- Samples taken from different positions in the mixer are compared for unit weight, air content, slump, and strength to verify mixing adequacy.
- Trial mixture qualification
- An approved trial mix establishes the design; a change in material source, admixture, or proportions requires re-qualification before production.
- Vibration spacing
- Internal vibrators are inserted at regular spacing, commonly not more than about 600 mm apart, and withdrawn slowly to avoid voids.
- Over-vibration effect
- Excessive vibration causes segregation and bleeding, while insufficient vibration leaves honeycomb and bug holes; both are nonconformances.
- Steam curing limits
- Accelerated curing follows a documented temperature-time curve with limited rates of rise and fall and a capped peak temperature to control cracking.
- Stripping strength
- The concrete strength at which forms may be removed, verified by test or maturity method to resist damage and construction loads.
- Form dimensional check
- Forms are verified for dimensions, squareness, and camber before casting, and form wear is compared against product tolerance limits.
- Stressing force from pressure
- The applied force equals gauge pressure multiplied by ram area, corrected by the system calibration; gauge and ram are calibrated together.
- Elongation check
- Measured strand elongation is compared to calculated elongation within the approved tolerance and is the primary verification of stressing force.
- Seating loss
- The strand slip at the anchorage when force transfers to the anchor; it is measured and compared with the design assumption.
- Transfer strength
- The concrete strength at transfer of prestress must meet the design requirement, verified by cylinder testing or an approved maturity method.
- Strand damage rejection
- Arc strikes, kinks, and mechanical damage to strand are cause for rejection; strand must be protected from weld current and sparks.
- Air content test
- Fresh concrete air content is measured by pressure meter or volumetric method with calibrated equipment at the specified frequency.
- Test frequency nonconformance
- A missed required test is a nonconformance requiring documented disposition; it is not a waived requirement.
- Maturity method
- An estimate of in-place strength from the temperature-time history of the concrete, calibrated to the specific mixture by a strength-maturity relationship.
- Cylinder handling
- Compressive strength specimens are molded, protected, and transported without damage, then tested per the applicable standard method.
- Camber tolerance
- Measured camber is compared with design camber at a defined reference condition and time after transfer, within the specified tolerance.
- Embedded item position
- Embedded plates, inserts, and strand projections are checked against approved shop drawings within the stated position tolerance.
- Nonconformance disposition
- Nonconforming product is identified, segregated, and dispositioned as repair, rework, or reject, with engineering approval where required.
- Lifting plan
- A documented plan matching lifting insert capacity, sling geometry, and equipment rating to the member weight and handling loads.