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3 cards from this section. Quick, good the night before a test.
What does CBR stand for?
Think about the test's full name.
What is the diameter of the standard plunger used in the CBR test?
Recall the measurement of the test equipment.
What is the primary purpose of the CBR test?
Think about how soil impacts pavement.
True or False: The CBR value increases with deeper penetration.
Focus on the expected behavior of soil during testing.
If a soil has a CBR value of 50% at 2.5 mm and a CBR value of 70% at 5 mm, should this soil be considered robust enough for roadway support? Discuss the implications if the values were reversed.
Consider the characteristics of soil strength and implications for road durability.
Describe a scenario where the CBR value might dramatically change. What environmental or physical factors could influence this result?
Reflect on the effects of weather or mistreatment of the soil during the CBR test.
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