PCI Plant Quality case studies
PCI Plant Quality · Put your knowledge to work in context.
PCI Plant Quality refers to the personnel-certification pathway for people who carry quality responsibility inside a precast, prestressed concrete plant. In practice it is aimed at quality-control technicians and inspectors, plant quality managers, and the production or engineering staff who sign off on inspection records, mix documentation, and dimensional checks. The PCI Plant Quality case studies are 5 cases and about 3,209 words.
1Audit Readiness When the Evidence Is Already Compromised
A precast plant is 18 days from its annual PCI certification audit. The new quality manager finds four issues.
672 words, about 3 min2Fine Aggregate FM Shift After a Supplier Source Change
Over three weeks, the fineness modulus of the plant's fine aggregate has risen from 2.82 to 3.14 after the supplier switched to a new pit. The mix is a 4,000 psi precast box culvert mix with 564 lb/yd³ of Type I/II cement, 0.45 w/cm, 1,250 lb/yd³ of 1-in nominal coarse aggregate, and a Type A water reducer at 4 oz/cwt.
672 words, about 3 min3Moisture Probe Error, Low Breaks, and Map Cracking on Steam-Cured Tees
A plant is casting 5,000 psi precast double tees with a 15% slag blend at 705 lb/yd³ cementitious, 260 lb/yd³ water (0.37 w/cm), and air entrainment. Over two days, 12 batches show slump 3.5–4.5 in and air 6.8%, while the ticket shows the sand moisture probe at 6.2%.
657 words, about 3 min4Short Strand Elongation, a Broken Wire, and an Expired Jack Gauge
A bed is stressing twelve 1/2-in, 270-ksi low-relaxation strands to 0.75 fpu (31.0 kips each) for a 100-ft precast girder. The theoretical elongation is 8.5 in.
593 words, about 3 min5Wall Panel Tolerance Exceedances and Storage Cracking
A plant is inspecting 24 precast wall panels, 8 ft wide by 20 ft long by 8 in thick. The project specification permits length ±1/2 in, width ±1/4 in, thickness ±1/4 in, and diagonal difference ±1/4 in.
615 words, about 3 min