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Questions and Answers
What property of soils is indicated by the Plasticity Index?
What property of soils is indicated by the Plasticity Index?
- Compaction
- Liquid limit
- Clay content (correct)
- Permeability
What test is used to determine the potential strength of soil/aggregates?
What test is used to determine the potential strength of soil/aggregates?
- Liquid Limit Test
- Abrasion Test
- CBR Test (correct)
- Gradation Test
What is the recommended thickness range for Hot Mix Asphalt Overlay?
What is the recommended thickness range for Hot Mix Asphalt Overlay?
- 3” to 5” (correct)
- 2” to 4”
- 5” to 7”
- 1” to 2”
Which value indicates poor engineering material for soils?
Which value indicates poor engineering material for soils?
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What material should be free from hard lumps and not contain more than 15% material retained on the No. 4 sieve in sub-base and base course?
What material should be free from hard lumps and not contain more than 15% material retained on the No. 4 sieve in sub-base and base course?
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Study Notes
Soil Properties
- The Plasticity Index indicates the degree of plasticity of a soil, which is a measure of how much water a soil can absorb before it becomes plastic.
Soil Testing
- The Unconfined Compression Test (UCT) is used to determine the potential strength of soil and aggregates.
Asphalt Overlay
- The recommended thickness range for Hot Mix Asphalt (HMA) Overlay is typically between 1.5 to 5 inches (38 to 127 mm).
Soil Quality
- A value of 0-3 on the Plasticity Index (PI) indicates poor engineering material for soils.
Aggregate Quality
- Aggregates used in sub-base and base courses should be free from hard lumps and contain no more than 15% material retained on the No. 4 sieve.
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