Quality Assurance Flashcards

Per ACI 318, for specified strength f'c of 5,000 psi or less, concrete strength is satisfactory if every average of three consecutive tests equals or exceeds f'c and no individual test falls below f'c by more than:

Answer: 500 psi

ACI 318 allows individual tests no lower than f'c minus 500 psi when f'c ≤ 5,000 psi.

Under ACI 318, a single 'strength test' is defined as the average strength of at least:

Answer: Two 6x12 cylinders or three 4x8 cylinders

ACI 318 defines a strength test as the average of at least two 6x12 or three 4x8 cylinders from the same sample.

A QA manager ranks defect types by frequency to focus on the few causes responsible for most problems. Which tool is being used?

Answer: Pareto chart

A Pareto chart applies the 80/20 rule to prioritize the vital few causes.

ISO 9001 is best described as an international standard that specifies requirements for:

Answer: Quality management systems

ISO 9001 sets requirements for a quality management system.

The continuous improvement cycle associated with W. Edwards Deming consists of which four steps?

Answer: Plan-Do-Check-Act

The Deming (PDCA) cycle is Plan, Do, Check (or Study), Act.

After repeated honeycombing on cast-in-place walls, the team categorizes potential causes under materials, methods, manpower, and machines. Which tool is this?

Answer: Ishikawa (fishbone) diagram

The Ishikawa diagram organizes potential root causes into categories.

For U.S. testing laboratories, calibration of measuring equipment should ultimately be traceable to standards maintained by:

Answer: NIST

NIST maintains the national measurement standards to which U.S. calibrations are traced.