Aggregate types

various-aggregates

AASHTO #1

AASHTO#1
  • This material has a 4 inch top size, sometimes called ballast.
  • Too bulky to be used as a surfacing material but it is great for subgrade stabilization.
  • Used for construction entrances, road base and ditch lining.
  • Clean material that does not compact

PA 2A

2A
  • PennDOT 2A has a 2 inch top size and many fines
  • Great compaction and used as a road base and under slabs
  • Primarily a clean material that will compact and will drain
  • Used where stability and drainability are concerns.

2RC / 2A Modified

2RC
  • Material has a 2 inch top size and is a mix of coarse stone and fine material
  • Fines in material will include dirt, silt, loam, or clay
  • Great compaction and is used under slabs, road base, and fill
  • Primarily a dirty material that will compact and does not drain

AASHTO #3

  • This material is similar to AASHTO #1, but has a 2.5 inch top size.
  • It is also a bulky material but is somewhat easier to handle.
  • Used mostly in drainage situations
  • Clean material that does not compact

3A Modified

3A-MOD
  • Blend of #3 and 2RC/2A MOD. 2 ½” topsize
  • Used as heavy-duty sub-base for roads and parking lots.
  • Great for areas with deep fill requirements where compaction is desired.

AASHTO #8 washed

AASHTO#8 Washed
  • This material has a 1/2 inch top size.
  • Used in ready-mixed concrete and hot mix asphalt
  • Also used for driveways, walkways, drainage, and at times pipe bedding.
  • Clean material that does not compact well
  • Is used as an anti skid material in some situations.

AASHTO #10 washed

AASHTO#10
  • It has a 3/8 inch topsize and sizes down to a silt sized material.
  • Commonly used in concrete block, masonry products, and pipe bedding
  • This material is a crushed stone dust similar to the fines found in 2A.
  • Material has many fines, but will not compact and it does drain slowly

AASHTO #57 washed

AASHTO #57 Washed
  • This material has a 1-1/2 inch topsize and is a clean material.
  • Used in ready-mixed concrete and hot mix asphalt
  • Also used for driveways, walkways, and drainage
  • Clean material that does not compact well

AASHTO #467

AASHTO 467
  • Material has a 2 inch top size
  • Used in asphalt and ready-mix concrete mixes
  • Open graded and drains freely
  • Clean material that does not compact well

Anti Skid (AS3)

Anti Skid AS3
  • Used as a skid deterrent by PennDOT and townships throughout PA
  • There are many types and classifications of anti-skid material
  • Material will not compact, and is used for traction

RIP RAP: R3 (3"-6")

R3
  • Large boulder-sized rock that is often seen lining rivers and streams.

RIP RAP: R4 (6"-12")

R4
  • Large boulder-sized rock that is often seen lining rivers and streams.

Other Available Rock

 

RIP RAP: R5 (9″-18″), R6 (12-24″), R7 (18″-30″), R8 (24″-42″)

 

  • Classified into six categories, R3 to R8, the material ranges in size from 6″ to 42″.
  • Due to its size and nature, this material will not compact.
  • Made to be machine placed in uniform layers.