Smokey Point Concrete and Skagit Readymix - concrete admixtures

By: Smokey Point Concrete  11-11-2011

Concrete admixtures reduce the cost of construction, modify properties of hardened concrete, ensure quality of concrete during mixing, transporting, placing, and curing, and overcome certain emergencies during concrete operations.

Chemical admixtures are used to improve the quality of concrete during mixing, transporting, placement and curing. They fall into the following six categories:

  1. Water reducers
  2. Set accelerators
  3. Air entrainers
  4. Set retarders
  5. Superplasticizers
  6. Specialty admixtures: corrosion inhibitors, shrinkage control, alkali-silica reactivity inhibitors, and coloring

Water Reducers

Water-Reducers are chemicals used to lower the water content and increase strength or to obtain a higher slump using the same water content for pumping the concrete or when you are dealing with hot weather.

A water reducer is recommended for use in:

  • Conventionally placed concrete mixes containing a wide range of cements, granulated slags, Class C and F fly ashes, silica fume and aggregates.
  • Reinforced, precast, prestressed, lightweight or normal weight concrete and pumped concrete
  • Residential/commercial flatwork and formed surfaces


An accelerator are chemicals that reduce the initial set time of concrete and are recommended in cold weather.

An admixture is recommended for use in concrete applications where accelerated time of setting and increased early strengths are desired.


A accelerator provides the following advantages:

  • Accelerated setting time across a wide range of temperatures
  • Earlier finishing of flatwork
  • Earlier stripping and reuse of forms
  • Earlier finishing of slabs – reduced labor costs
  • Increased early and ultimate compressive and flexural strength

Hydration Stabilizers

The set-retarding characteristics of a Stabilizer aid in the production of concrete with the following special qualities:

  • Improved workability
  • Reduced segregation
  • Superior finishing characteristics for flatwork and cast surfaces
  • Moderate to extended retardation – depending on the dosage rate used
  • Provides flexibility in the scheduling of placing and finishing operations
  • Offsets the effects of slump loss during extended delays between mixing and placing
  • Helps eliminate cold joints
  • Allows for dead-load deflection to take place (before concrete sets) in extended pours for bridge decks, cantilevers, nonshored structural elements, etc.
  • Effective as a singular admixture
  • Reduces waste associated with concrete washwater and returned concrete

A Stabilizer is recommended for use in all types of concrete where moderate to extended retardation of set time and improved performance are desired.

This admixture improves pumped concrete, shotcrete (wet mix) and conventionally-placed concretes.  It improves plain, reinforced, precast, prestressed, lightweight and normal weight concrete.

*** Primary Applications for use of a Stabilizer

  1. Stabilization of concrete washwater
  2. Stabilization of returned plastic concrete
  3. Stabilization of freshly batched concrete for long hauls

Stabilizers will not initiate or promote corrosion of reinforcing steel in concrete.

Air Entrainment

Concrete durability research has established that the best protection for concrete from the adverse effects of freeze/thaw cycles and deicing salts results from: proper air content in the hardened concrete; a suitable air-void system in terms of bubble size and spacing; and adequate concrete strength, assuming the use of sound aggregates and proper mixing, placing, handling and curing techniques.

When unusually low or high amounts of an air-entraining admixture are required to achieve normal ranges of air content or if the required amount of air-entraining admixture necessary to achieve required levels of air content is observed to change significantly under given conditions, the reason should be investigated.  In such cases, it is especially important to determine: (a) that a proper amount of air is contained in the fresh concrete at the point of placement; and (b) that a suitable air-void system (spacing factor) is being obtained in the hardened concrete.

Other products and services from Smokey Point Concrete


Smokey Point Concrete and Skagit Readymix - readymix concrete

SPC / SRM has developed over 400 mixes, has a number of concrete tools and supplies, and are excited to help you finish your job and create the look you want. Concrete is just like the sponge that you leave on the edge of the sink after you cleaned your dishes. Concrete utilizes cement as a glue to hold together a mixture of stone, sand, water and cement.


Smokey Point Concrete and Skagit Readymix - aggregates

To order your aggregates for delivery please call Skagit Readymix serving Skagit County at 360-856-0422 or Smokey Point Concrete serving Island and Snohomish Counties at 360-435-5791. The width of our dump trucks are approximately 10 feet, the trucks mirrors stick out further and prefer a 12 foot width opening. Smokey Point Concrete and Skagit Ready Mix sell aggregate at their plant locations and also provide delivery.


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Smokey Point Concrete and Skagit Readymix offers a limited supply of products from bull floats, trowels, and hand edgers to sealers, colors, and hardeners. Please provide at least one week for us to order your special tool. Ask dispatch for more information next time you are in our office.


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Smokey Point Concrete and Skagit Readymix - pervious concrete

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Smokey Point Concrete and Skagit Readymix - redi rock

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