Custom Concrete Mix Design

From large construction jobs to small backyard projects, we can match your needs with the right ready-mix concrete solution.

“Ready” is the key to unparalleled service. Our ready mix is always ready, and always there when you need it. We control slump before it goes into the truck with our automated central mix. With more that 40 trucks in just Sioux Falls, and more across the region, radio-dispatching ensures prompt delivery. Experienced drivers know how to get their trucks into even the tightest spots. Pumps are available on request.

Normal Weight Mix

Many building projects call for normal weight mix and do not require unique aggregates or out-of-the-ordinary components. But no job is ordinary at Knife River. Our normal weight mix is made for easy application and long-lasting durability.

  • 1” max. size aggregate
  • 3/4” max. size aggregate
  • ½” max. size aggregate

Self-consolidating Concrete

If your project requires the application of self-consolidating concrete, we can mix it to meet your specifications and perform beyond your expectations.Also known as self-compacting concrete, SCC is highly flowable and non-segregating. It easily spreads into place, filling the formwork and encapsulating the reinforcement without any mechanical consolidation.

The spread, or slump flow, of SCC ranges from 18-32 inches (455-810 mm) based on the requirements of the project. Viscosity is controlled by designing a mix ideally suited to the application.

High Early Strength Concrete

Throughout South Dakota and across the region, keeping roadways in good condition with a minimum of traffic disruption is an ongoing effort. High early strength concrete for new pavements, full-depth repairs, and other patches on roadways is one solution that is increasingly used to get roads open quickly.

There is some concern about the long-term durability of this product if roadways are opened or reopened too early, In some cases, excessive shrinking, cracking or other environmental conditions have caused early deterioration of full-depth repairs and slab replacements.

At Knife River, we keep these variables in mind and pay careful attention to mix design, minimizing the risks and delivering a reliable product you can trust.

Lightweight Concrete

Lightweight concrete is often the application of choice to reduce the dead load of a concrete structure, allowing the structural designer to reduce the size of architectural elements like columns, footings, and other load-bearing structures. By using this unique concrete mix, you reduce the need for steel reinforcements and lower the overall volume of concrete required, which can result in lower overall costs.

This special formula for use in structural applications is made with lightweight aggregates, provides a better fire rating, and provides improved insulating outcomes for wall elements than normal weight concrete. While it may be lighter in weight, there are mixes available with the same strength as normal weight.

Lightweight concrete from Knife River may be an ideal and budget-wise solution for your next building project.

Please allow a minimum of two weeks notice before order date.


Choosing the right grout is as important as choosing the other concrete materials for your building project.

The terms grout and mortar and often incorrectly used interchangeably. Unlike mortar, grout does not necessarily contain aggregate and is delivered in a pourable consistency. Grout is used to fill spaces and provide continuity between building elements, and in some cases such as in reinforced masonry construction, will act in a structural capacity.

There are many types of grout, which is often identified by its application. Choosing the right grout and using it properly can improve fire ratings, acoustic performance, and blast resistance.

At Knife River, we consider all the specifications of a job before recommending grout ideal for your application including those with and without aggregate, ensuring the proper consistency, fluidity, and stability.

Flowable Fill

Commonly comprised of combinations of cement, water, fine aggregate, and fly ash or slag, flowable fill was initially developed to resolve problems associated with poorly compacted soil or granular fill. More recently, and after much research and development, more a more robust fill is available that performs better in multiple applications including bedding and backfill for utility trenches, paving subbase, bridge abutment, and retaining wall backfill.

Due to new laws passed by the EPA, flowable fill is now being used more frequently to fill abandoned tanks, tunnels, mines, sewers, and other underground structures to improve environmental safety.

Higher strength mixtures can provide a bearing capacity similar to well-compacted soil, while lower strength mixes are better suited that require later excavatability. With no compaction required, flowable fill offers significant advantages over compacted back fill.

  •  Versatile
  • Excavatable
  • Easy to place
  • Requires no settlement
  • Improves worker safety
  • Allows fast return to traffic
  • Reduces equipment needs
  • Can be placed in all weather conditions

At Knife River, we can help you choose the ideal flowable fill mix for your project based on its intended use.