Driving Innovation, Creating Value.

Washed Base Material - Ordovician Dolomitic Limestone

WASHED BASE MATERIAL is a washed coarse aggregate produced from the highest quality Ordovician Dolomitic Limestone. It is manufactured to specified physical properties and sizes. Because the material is washed, it contains minimal fines and reduced deleterious materials. Pattison WASHED BASE MATERIAL reduces the amount of costly additives required to produce concrete. It extends the life expectancy of roads, reduces cracks, freeze/thaw impacts and maintenance costs.

Washed Base Material

Also known as concrete stonewashed rocks, washed stone, D467, D57, D67. Pattison produces Concrete Stone from Ordovician Dolomitic Limestone in our state-of-the-art, jaw/cone crushing plant. Our plant features sophisticated compression crushing technology that reduces fines and increases fractured faces.

Washed Base Material Production

This material is frequently ordered with specific physical properties. Pattison’s quarry offers a variety of ledges that meet these requirements. Material sourced from these ledges is durable, has minimal deleterious materials and performs above requirements on freeze thaw, abrasion, specific gravity and absorption tests.

Washed Base Material Certifications

This product meets Iowa’s highest usage designations as Class 3i and 3iB. It can be used in interstate highway paving, bridge decks and overlays. Pattison’s Washed base Material is approved for FAA airport paving and other federal projects. It is certified for Department of Transportation work in Iowa, Missouri, Nebraska, Minnesota.

Direct Rail Loadout

With our direct to rail transfer system, Washed base Material products move quickly from production to rail loading with minimal handling, dramatically reducing product degradation, and material handling costs. Here’s what Wikipedia has to say

More about Ordovician Dolomitic Limestone

When it comes to rock, age really matters.  Ordovician Dolomitic Limestone is some of the highest quality, hardest and most durable anywhere in Iowa. Ordovocian formations are only found in the northeast portion of Iowa. Pattison’s Clayton, IA quarry site is right in the middle of it.

Concrete Stone Certifications

CertificationsSizesTech SizeMaterial Type
1-1/2" x 3/8"
1" x 3/8"
3/4" x 3/8"
Dolomitic Limestone
1-1/2" x 3/8"
3/4" x 3/8"
Dolomitic Limestone
MODOT Gradation DD673/4" x 3/8"Dolomitic Limestone
NEDOT Class ED571" x 3/8"Dolomitic Limestone
1" x 3/8"
3/4" x 3/8"
Dolomitic Limestone

Concrete Stone Properties

Abrasion28% to 35%
Absorption1.00% to 2.05%
Specific Gravity2.65 to 2.71
"A" Freeze1 to 2
Chert (concrete stone only)0.0% to 0.8%
Magnesium Sulfate Soundness2.0% to 12.9%
14 day reactivity.02% to .04%
28 day reactivity.05% to .06%
Durability Factor
(ASTM 666b)
102.1% to 103.1%
Insoluble Residue 1.03%
Disclosure: The information presented above is to the best of our knowledge accurate based on testing by certified independent laboratories. Any recommendations or suggestions are made without guarantee since conditions and/or material handling are out of our control. Pattison warrants that purchased product will meet the specifications set forth by the buyer.

State of the art Aggregate Plant

Pattison’s newly installed Cone Crusher and production plant is state-of-the-art, producing some of the highest quality Ordovician Dolomitic Limestone Washed base Material.

Material is separated into various required sizes without inducing fractures, while yielding a refined individual rack shape that is the most desirable for tight compaction and stability. Pattison’s new aggregate plant produces Washed base Material of exceptional quality.

Pattison Roadrock Plant

Logistics second to none

Pattison recently completed its Rail Spur project, extending multiple rail lines directly into our new state-of-the-art aggregate production plant!.

Pattison’s advanced direct to rail loadout system coupled with the Pattison rail spur allows aggregate products to be loaded directly from the production plant on to enclosed rail ore cars for delivery. Eliminating excess handling saves costs, and insures a higher quality product.

Pattison Direct to rail load out

Pattison High Quality Aggregates and Proppants

Pattison produces high quality ordovician dolomitic limestone Aggregates and silica proppants.  Our Clayton IA, quarry contains multiple limestone ledges yielding material with a variety of properties that meet various requirements.  Our products are certified for use by multiple state Departments of Transportation, and the FAA.

Revetment Stone

Asphalt Stone

Ballast Stone

Concrete Stone

Clean Stone

Fine Aggregate



Specialty Products

Contact our Aggregate Sales Team for more information!

Contact our Aggregate Team Now!

Our quarry is located in Clayton, IA. We are one of the only sources of Aggregates and Proppants that can load directly to Rail, Truck or Barge from the same facility! Our logistic & delivery systems out pace our competitors. We’d love to hear from you!

Contact information

Aggregate Team

:  (563) 964-0106

: AggInfo@pattisonsand.com

Main Office

701 1st Street
Clayton, IA 52049

: (563) 964-2860

: info@pattisonsand.com

Operations Office

24312 Mississippi Rd., Clayton, IA 52049

Hours of operation

Office Open Monday – Friday: 8am to 4pm
Operating Hours – 24/7