Champions Residential Inspections SAE Practice Test

Question: 1 / 400

What Plasticity Index range indicates medium plasticity?

20-30

10-20

30-40

20-40

The range that indicates medium plasticity is indeed 20-40. The Plasticity Index (PI) is a significant measure in soil science used to describe the plasticity characteristics of clay soils. A PI of 20-40 suggests that the soil has enough water-holding capacity to remain workable without becoming too sticky or too dry.

This range is important in engineering and construction contexts, as soils with medium plasticity can exhibit a balance between strength and workability, which is crucial for various applications, such as foundation design and earthworks. A lower Plasticity Index typically indicates a drier and less workable soil, while a higher PI may suggest excessive stickiness and potential difficulties in handling.

Thus, understanding the medium plasticity range helps in assessing soil behavior under varying moisture conditions, contributing to more informed decisions in residential construction and inspections.

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