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. A laboratory receives a complaint from a customer about a test result. Under ISO 17025, what is a required element of the complaint-handling process? → Investigating the complaint and communicating the outcome to the complainant
3. According to ASTM C136, sieve analysis of aggregates requires that each sieve be shaken for a minimum of how many minutes? → 1 minute
4. Which petrographic feature in coarse aggregate is most directly associated with accelerated alkali-silica reaction (ASR) susceptibility? → Strained quartz and microcrystalline silica
5. Under CCIL accreditation standards, how long must a laboratory typically retain raw data and sample records? → 5 years
6. In field density testing of compacted asphalt, what does the nuclear gauge method measure to determine density? → Attenuation of gamma radiation passing through the material
7. A soil sample for volatile organic compound (VOC) analysis must be stored at what temperature to prevent analyte loss? → Refrigerated at 4°C
8. What does the water-to-cementing materials ratio (w/cm) primarily control in hardened concrete? → Strength and durability
9. For trace metal analysis, why must sample containers be acid-washed before use? → To remove adsorbed metals that could contaminate low-level samples
10. 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
11. Which AASHTO standard governs the determination of the maximum specific gravity of asphalt mixtures (Gmm)? → AASHTO T 209
12. When capping concrete cylinders with sulfur mortar per ASTM C617, the cap thickness should not exceed: → 6 mm
13. 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
14. 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
15. In the volumetric method for air content (ASTM C173), which type of concrete is it specifically required for? → Lightweight or aggregate containing concrete
16. What is the primary reason biohazardous samples must be clearly labeled before entering the laboratory? → To protect laboratory personnel and ensure proper handling and disposal
17. 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)
18. 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
19. Per ASTM D4791, a coarse aggregate particle is classified as flat and elongated when its longest dimension to shortest dimension ratio exceeds which threshold? → 5:1
20. Gap-graded aggregate is characterized by which of the following gradation patterns? → An absence of intermediate particle sizes, with concentrations at coarse and fine ends
21. What does a bleeding rate in fresh concrete primarily indicate? → Excess mix water migrating to the surface
22. When collecting air samples using sorbent tubes for VOC analysis, the MOST important parameter to record in the field is: → Sample volume collected (flow rate × sampling time) and ambient temperature
23. A laboratory balance is found to read 0.05 g high across its entire range. This type of error is called: → Systematic error
24. Which ASTM standard governs the determination of flash and fire points of bituminous materials using the Cleveland Open Cup method? → ASTM D92
25. When performing the splitting tensile strength test (ASTM C496), the load is applied along: → A diametral plane along the length of the cylinder via bearing strips
26. 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
27. Which solvent is most commonly used for Soxhlet extraction of semi-volatile organic compounds from solid matrices? → Dichloromethane or hexane mixture
28. The hierarchy of controls in laboratory safety lists which measure as MOST effective at reducing hazard exposure? → Elimination or substitution
29. At what test temperature is Marshall Stability typically determined, and why? → 60°C, to simulate maximum summer pavement surface temperature
30. Which test method is used to measure the elongation index of coarse aggregate according to Canadian standards? → CSA A23.2-13A