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About Aggregates

Rocks, stones, aggregates.  What are they?  “Aggregates” can be defined as natural materials that have been processed and/or sorted to achieve given properties.  Aggregates may be used to give strength to concrete and asphalt or to create pleasing architectural landscaping effects.  Almost every type of construction contains aggregate—from the small aggregate particles in your roofing shingles to drainage around pipes.  From foundations of bridges to railroad beds and the stabilizing of beaches and inlets, aggregates will be found helping to support the structure or loads.

Aggregates are literally the building blocks of all types of residential, commercial and public works construction projects.   At Milestone, we select and process aggregates that will best meet your needs for quality and cost-effectiveness.

Processing Aggregates

To provide you with aggregates for your projects we use careful and environmentally-friendly processes and the strictest quality control.

The following processes outline a typical operation:

Crushing. The first step in preparing stockpiles for specific uses is crushing large boulders and aggregates into usable sizes.  We can also crush gravels to change the shape of the aggregate particles to the desired size and angularity.

Sizing (screening). Once the rock has been sufficiently reduced in size, we separate it into individual stockpiles with specific ranges of particle sizes.  Our large screening operations have a number of wire mesh screen decks with each deck having progressively smaller openings between the wires.  These screens are slanted and empty the material retained on each screen out onto conveyor belts, which carry the material through the washing and stockpiling processes.

Washing. We wash the screened materials to remove dust, clay and other impurities which may affect the quality of your finished project.

Stockpiling. We carefully stockpile the processed aggregates using best practices to 1) prevent separation and segregation of the coarse and fine particles within the piles, 2) prevent degradation of the aggregate into more very fine particles, and 3) prevent contamination.  Poor stockpiling practices can result in particle size separation even within a pile of limited particle sizes.

At Milestone our neighborhood is always our primary concern.  We only use processes that are environmentally responsible and safe for our workers and neighbors, always maintaining and leaving our sites in excellent condition.