Select fill is a type of soil used in construction projects to provide a stable foundation for buildings and other structures. It is typically made up of a combination of clay, sand, and gravel, and is chosen for its ability to compact well and provide good drainage.
One important aspect of select fill is its plasticity index (PI), which is a measure of the soil’s ability to change shape without cracking or breaking. The plasticity index is determined by measuring the amount of water that can be added to the soil before it becomes too plastic and loses its stability.
The plasticity index of select fill is typically quite low, usually falling between 6 and 15. This is due to the fact that select fill is made up of a combination of different types of soil, each of which has its own unique properties and characteristics. The clay, sand, and gravel in select fill all contribute to its low plasticity index, making it a stable and reliable choice for construction projects.
Another benefit of select fill is its ability to drain well. The sand and gravel in select fill create small voids in the soil that allow water to pass through easily, preventing water from pooling and causing damage to the foundation of a building or other structure.
Overall, select fill is an excellent choice for construction projects due to its stability, low plasticity index, and good drainage properties. It can be used as a foundation for buildings and other structures, as well as for creating level ground for roads, sidewalks, and other surface areas.
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