ACI CTCI study guide
ACI CTCI · Work through your exam, one topic at a time.
The Concrete Transportation Construction Inspector (CTCI) credential is one of the certification programs administered by the American Concrete Institute. ACI describes its certification offerings as designed to form a minimum qualification for personnel employed within the concrete construction industry, and the CTCI sits within the Inspection Programs group, which ACI characterizes as assessing the knowledge to inspect various concrete installation and construction practices. It is intended for personnel who inspect concrete work on transportation projects, where field decisions about placement, testing, and documentation carry real consequences. The exam draws on two broad knowledge areas: concrete construction inspection and concrete field and laboratory testing. Topics on this exam: Concrete Construction Inspection and Concrete Field and Laboratory Testing. The ACI CTCI study guide has 2 sections and about 653 words.
01Concrete Construction Inspection: Duties, Documentation, and Field Judgment
Construction inspection is a verification and documentation function, not a design or acceptance-authority function. The inspector confirms that materials, proportions, handling, placement, consolidation, finishing, curing, and protection match the approved plans and specifications, and records what was observed in a contemporaneous, factual daily report. Know the difference between inspection (observe and record), testing (sample and measure), and acceptance (a decision reserved for the engineer or architect of record). Questions often hinge on who decides.
309 words, about 2 min02Concrete Field and Laboratory Testing: Sampling, Fresh Properties, and Strength
Field testing starts with a representative sample: composite samples taken from the middle of the discharge stream, never the first or last portion, and not from a stationary hopper unless specified. Standard test methods (slump, air content, temperature, density/unit weight, and strength specimens) each define sample size and time limits - know that fresh-property tests should be completed promptly after sampling and that the sample must be remixed before each test. Slump measures consistency, not strength or workability in a broad sense; a low slump does not automatically mean low strength, and adding water on site changes w/c ratio and is controlled by specification. Air content is critical for freeze-thaw durability; test method choice depends on aggregate type (pressure method is unsuitable for highly porous or lightweight aggregate - use volumetric).
344 words, about 2 min