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Structural · definition

The sand and gravel/stone that makes up most of concrete's volume, providing strength and bulk in the cement matrix.

Source: American Concrete Institute — ACI Concrete Terminology

Where this term fits in a remodel

The pillar guides set terms like this one in context — what the work involves, what drives its cost, and where it sits in the sequence of a project. Pricing a specific house takes a defined scope and an on-site assessment.