CTQP Materials Sampling and Testing 3

Question 1

What is the standard acceptable age range for testing concrete cylinders designated as '28-day' compressive strength specimens?

Accepted Answer

Cylinders may be tested between 26 and 30 days and still qualify as the 28-day break

Answer

Cylinders must be broken on exactly day 28 — no tolerance allowed

Answer

Cylinders should be tested between 27 and 35 days for statistical accuracy

Answer

Cylinders must be tested at exactly 30 days to ensure full curing

Question 2

When a materials test result fails to meet FDOT specification requirements, what is the required course of action?

Accepted Answer

The material represented by the failing test must be evaluated, remediated, removed, or disposed of per specification requirements

Answer

The contractor may immediately perform one retest and use that result if it passes

Answer

The failing result is statistically averaged with nearby passing results to determine acceptance

Answer

The inspector may waive the failing result if workmanship otherwise appears acceptable

Question 3

What does Chain of Custody documentation ensure in the materials testing process?

Accepted Answer

That the sample identity and integrity are maintained and documented from collection through final testing and reporting

Answer

That samples are transported to the laboratory within the minimum time allowed

Answer

That the contractor is financially responsible for all testing costs incurred

Answer

That the district materials engineer personally approves each sample before testing

Question 4

What requirements apply to nuclear density gauges used for field compaction testing on FDOT projects?

Accepted Answer

Gauges must be calibrated per the manufacturer's schedule and operated by trained, licensed personnel who comply with NRC or Agreement State regulations

Answer

Nuclear gauges may be operated by any project employee after a brief orientation

Answer

Nuclear gauges must be replaced with new equipment every five years regardless of condition

Answer

Nuclear gauges may only be used on asphalt surfaces — not on soil or base course

Question 5

When must construction materials be sampled for FDOT acceptance testing?

Accepted Answer

At the frequency and location specified in FDOT's Materials Sampling, Testing, and Reporting Guide for the applicable material

Answer

Only at the production plant before the material is loaded for delivery

Answer

Only after the material has been placed and compacted in the final location

Answer

At the discretion of the contractor's quality control personnel based on observed consistency

Question 6

What is the primary purpose of a Project Materials File (PMF) on an FDOT construction project?

Accepted Answer

To maintain all materials documentation including test results, certifications, and source approvals for the project

Answer

To store contractor invoices and payment records for auditing purposes

Answer

To track all equipment calibration records and operator certifications for the project duration

Answer

To record daily weather conditions and temperature logs affecting material placement

Question 7

In FDOT's quality-based acceptance system, what is the function of a 'pay factor' applied to materials test results?

Accepted Answer

It is a multiplier applied to the pay item quantity, rewarding higher quality with a bonus and penalizing lower quality with a reduction

Answer

It determines the hourly pay rate for certified materials inspectors on the project

Answer

It determines the minimum number of tests required before a lot can be accepted

Answer

It is used to calculate the total quantity of material required for the project bid