Which material size is associated with grillage?

Grillage refers to a type of structural foundation system often used in situations where the load-bearing capacity of the soil is limited. It consists of a platform or mat that distributes the weight of a structure over a larger area. The material size associated with grillage typically refers to the aggregate or stone used in the construction of the grillage bed.

The correct choice relates to the size of the aggregate particles used, which should be small enough to ensure proper compaction and load distribution. A size of #57 stone is commonly used for grillage because it strikes a balance between drainage and interlocking, providing stability while allowing for proper flow of water and minimal movement under load. This size is ideal for creating a solid and supportive base, which is essential in foundation applications.

In contrast, the other choices represent either finer or coarser aggregates that may not provide the same level of load distribution or compaction necessary for the specific applications of grillage. The #20 or smaller size might be too fine, potentially leading to inadequate drainage. The #30 size also can be similarly ineffective for the intended purpose. The #70 or smaller size would be more appropriate for finer applications and would not provide the necessary structural support when used improperly in grillage construction. Thus,