ICC (EC) SOILS TESTING - MATERIALS TESTING
(LAB) 2024-2025 QUESTIONS WITH 100%
CORRECT ANSWER
The strength of a soil, or the ability to compact a soil into a suitable construction
material will depend on? - CORRECT ANSWER Soil type
Soil density
The amount of water in the soil
Types of soils - CORRECT ANSWER Gravel (mm to cm's in size)
Sand (mm in size)
Silt (fine particles with little cohesion)
Clay (has cohesion, can stick together)
Organic soils (peat, topsoil)
Organic soils (O) - CORRECT ANSWER Have a large componet of dead or decaying
plants, and are not used in construction
Silt and Clay - CORRECT ANSWER Classified based on whether the soil is plastic or
non-plastic (eg. can you roll it into a ball)
Gravel and Sand - CORRECT ANSWER are classified based on whether or not all the
particle are roughly the same size(uniform, like a beach) or if there is large variety in
particle size (well-graded)
Gradation refers to the range of measured soil particle sizes. Gradation results in
classifying soil as? - CORRECT ANSWER Gravel ( > 2 mm)
Sand (between 0.075 and 2 mm)
Silt (0.002 to 0.075 mm)
Clay (< 0.002 mm)
The particle size distribution of coarse-grained soils is typically determined by? -
CORRECT ANSWER Mechanical sieve analysis
The particle size distribution of fine-grained soil is determined using a ? - CORRECT
ANSWER hydrometer analysis
Two parameters help to identify soils that are well-graded? - CORRECT ANSWER
The Coefficient of Uniformity (Cu)
The Coefficient of Curvature (Cc)
The hydrometer analysis is used to determine the gradation of - CORRECT ANSWER
slit and clay-sized particles.
Only soil particles passing the No. 40 sieve(0.425) are used in the - CORRECT
ANSWER hydrometer analysis
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