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In highway engineering, subbase is the layer of aggregate material laid on the subgrade, on which the base course layer is located. It may be omitted when there will be only foot traffic on the …

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Jun 22, 2025 · What Is a Subbase in Construction? The subbase is the layer of material placed immediately above the subgrade and directly below the base course or pavement.

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A subbase, in construction terms, is the layer of material placed directly beneath the base or pavement of a structure. It serves as a critical component that supports the weight of the …

The subbase layer is typically used to protect the pavement from the effects of frost heave and/or used to improve the constructability of the pavement layers above the subbase.

A subbase is a layer of material placed between the subgrade and the base course in pavement construction, providing support and stability to the pavement structure.

Nov 9, 2025 · The subbase layer is a carefully engineered stratum of material positioned directly above the subgrade (the prepared native soil or fill). This layer acts as a transitional element, …

A subbase is a thin layer of material placed on top of the prepared subgrade. Subbases provide uniform support to the pavement and a stable platform for construction equipment.