CCIL Cheat Sheet 2026

The 30 highest-yield CCIL facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Under which DOT hazardous materials classification are nuclear density gauges transported? → Class 7 – Radioactive Material
2. What does "Air Content" refer to in concrete testing, according to CCIL? → The volume of air voids in plastic concrete, excluding pores in aggregate particles
3. What is the most likely corrective action when nuclear density readings show significantly lower density at one end of a freshly paved mat? → Investigate roller pattern, breakdown temperature, and compaction uniformity in that zone
4. What does the term 'percent compaction' mean in the context of HMA field testing? → The ratio of field density to maximum theoretical density, expressed as a percentage
5. According to ASTM D422, what is the standard sieve size used to separate coarse and fine fractions during a mechanical sieve analysis of soil? → No. 4 (4.75 mm)
6. Which action is necessary when a sample contains aggregate larger than what is appropriate for the size of the moulds or equipment? → Sieve the sample to remove larger aggregates
7. What is the purpose of a longitudinal joint in asphalt pavement construction? → To connect adjacent lanes paved in separate passes while maintaining density at the seam
8. When sampling plastic concrete, which method is recommended? → Passing a receptacle completely through a discharge stream
9. What pavement condition survey method assigns a numerical rating from 0 to 100 to quantify overall pavement surface condition? → Pavement Condition Index (PCI) per ASTM D6433
10. Where should cementing materials be stored? → In a dry place, in moisture-proof containers
11. According to CSA A23.2-5C, when performing a slump test, how should the slump cone be lifted from the concrete sample? → Vertically, in a smooth and continuous motion taking approximately 5 seconds
12. What is a typical minimum percent compaction specification for HMA pavements? → 92–96%
13. Which specification document governs the performance grading (PG) of asphalt binders used in pavement construction across North America? → AASHTO M 320
14. When casting 3 cylinders measuring 100mm x 200mm, what is the minimum sample size required? → 20 liters
15. What is the minimum air void content typically specified for compacted hot mix asphalt pavement lifts to ensure adequate durability? → 3%
16. What is the purpose of the meniscus correction applied when reading a hydrometer during a particle-size analysis? → To account for the curved water surface at the hydrometer stem
17. Which method can be employed to eliminate oversized aggregate particles before casting cylinders? → Handpicking
18. What does a Plasticity Index (PI) of zero indicate about a soil sample? → The soil is non-plastic and has no range between liquid and plastic limits
19. What is the primary purpose of field density testing on hot mix asphalt (HMA) pavements? → To verify that the compacted pavement meets specified density requirements
20. During field density testing with a nuclear density gauge, what type of radiation is used to measure soil moisture content? → Neutron radiation from an Americium-Beryllium source
21. In backscatter measurement mode, approximately how deep does a nuclear density gauge measure from the pavement surface? → Approximately 50–75 mm (2–3 inches) from the surface
22. Nuclear density gauges use which radiation source to measure material density? → Gamma rays from a cesium-137 source
23. Which ASTM standard governs the determination of maximum theoretical specific gravity and density of bituminous paving mixtures? → ASTM D2041
24. What is the critical function of the spherically seated bearing block (upper platen) in a concrete compression testing machine? → To allow the block to tilt and align itself with the top surface of the specimen.
25. When casting 150mm x 150mm x 535mm beams, what is the minimum sample size required? → 55 liters
26. How many water-to-cementing materials ratios are typically needed for concrete trial mixes? → 3
27. What does PWL stand for in statistical HMA density acceptance specifications? → Percent Within Limits
28. What AASHTO classification would a soil with a liquid limit of 45 and plasticity index of 20 most likely fall under? → A-7-6
29. In the context of asphalt and aggregate testing, what procedure is followed for determining the slump of mixtures containing aggregate larger than 40mm? → Sieve the sample and conduct the slump test with the material passing through a 40mm sieve
30. How much time is typically allowed for obtaining, transporting, and remixing the sample? → 10 minutes