AASHTO #1 Crushed Stone

Type 1 Aggregate


AASHTO #1 is a large grade of crushed stone that is best suited for larger construction projects. It is a clean material that will not compact.

What Is #1 Crushed Stone?


Crushed stone is a construction aggregate with many applications. The most common types of rock used in crushed stone production are limestone, granite, quartzite, washed gravel, argillite and traprock. These rocks are mined and then crushed into specific sizes for a wide array of practical uses.


Crushed stone is a sustainable resource because it can be produced using nearly any kind of hard rock. At Union Quarries, we use Pennsylvania’s abundant limestone to create AASHTO #1 and other grades of crushed stone.


Varying grades of crushed stone are essential for many landscaping and construction projects, from decorative lining for residential ponds to stormwater diversion pits.


Differing grades of crushed stone are categorized based on the size of the pieces generated by the crushing process. #1 crushed stone is the largest grade.

AASHTO #1 Stone Size


Aashto #1 has a top rock size of 2 to 4-inches.


While it is too bulky to be effectively used for surfacing, this grade of crushed stone is an excellent material for subgrade stabilization.


AASHTO #1 is the largest crushed stone variety offered by Union Quarries.

Uses for AASHTO #1 Aggregate


As the largest crushed stone grade available, AASHTO #1 is naturally suited for larger jobs. Here are some common commercial and residential applications for materials of this grade:


  • Construction entrances.
  • Decorative lining for walkways.
  • Creating a stabilized road base.
  • Lining for ditches.
  • A driveway base with screening.
  • Lining diversion pits for stormwater.
  • Decorative edging for ponds.
  • Other large jobs, such as culvert ballasts.


If you’re planning on taking on any of these construction projects, AASHTO #1 might be the right material for you. Use our product calculator to help determine how much material your project will require, then request a free quote from Union Quarries.

Find the Right Crushed Stone at Union Quarries


Having access to a reliable producer of stone, concrete and blacktop can make all the difference when it comes to a successful construction job. Union Quarries is proud to provide service from Carlisle to the entire Central PA region. We make safety a priority and offer specialized services that you won’t find at any other quarry in Pennsylvania.


Union Quarries has been Central PA’s reliable provider of crushed stone since 1961. We offer AASHTO #1 as part of a wide range of sizes of crushed stone to fit the needs of any commercial or residential construction project you have in mind.


For assistance in finding the best grade of crushed stone for your project, feel free to reach out to Union Quarries. Our knowledgable staff is prepared to assist homeowners, builders and contractors in planning their projects and their budgets. Give us a call at (717) 249-5012 or get in contact with us online to speak to a representative about your next project so we can help you find the right grade of stone.