Concrete admixtures are naturally occurring or processed chemicals which are “added” to concrete, while in a plastic state, to modify its properties. These modifications are made to enhance the performance of standard concrete mixes or change the normal working properties of typical concrete and are a benefit to virtually all the parties involved in a concrete placement. These “additions” to the mix can affect the concrete; as it is being produced, transported in the truck or while it is still fresh and being placed. Admixes of this variety are an aid to the Ready Mix Producer as well as the contractor placing the material. Admixtures which give cured/hardened concrete special properties such as durability, strength, chemical resistance, color, etc are a benefit to the owner or end user of a project. Concrete Admixes generally fall within the broad classifications of; air entrainment, set accelerators, set retarders, water reducers, superplasticizers and specialty. At Salmon Bay we use every variety of these admixes, in order to provide our customers with the specific mix of concrete that will meet their concrete performance needs.
Often overlooked when thinking of admixes, cement is really the most basic of admixes. Adding more to a mix of concrete, increases the strength, adds durability, improves pumpability, makes the mix easier to finish, accelerates the set time….and that’s not even a complete listing of the benefits derived from adding cement to concrete. More cement is a good thing when considering an admix for concrete.
Is currently the admix de jour, due to the fact that it is a very green product that imparts many beneficial attributes to concrete. Flyash is a 100% recycled material, which is reclaimed from coal burning industries and coal fired power plants. As an admix; it is a densifier, improves concrete durability, improves pump-ability, increases long term strength gain and can replace a small amount of cement normally used in a concrete mix.
MasterAir AE 90 is the air-entraining admix used by Salmon Bay. Entrained air is designed into a mix; where as entrapped air is a consequence of mixing concrete. MasterAir AE-90 disperses microscopic air bubbles uniformly throughout the mix improving resistance to the effects of freeze thaw cycling. It is a must in all concrete to be used for exterior flatwork in the Pacific Northwest. Additionally, in low sackage mixes, “air” will improve the ultimate strength of the concrete mix.
As the name implies, these admixes reduce the required water content of a concrete mixture by approximately 5-10 percent. Concrete containing less water, which still maintains the desired slump, is usually a higher strength concrete. By reducing the water content in a yard of concrete by as little as 1 gallon; the 28 day strength can be improved by as much as 300-500 psi. There are 3 ranges of water-reducing (WR) admixes; normal-range (5% water reduction), mid-range (8%) and full-range (10%). Salmon Bay’s 3 WR’s are MasterPozzolith 200N (normal-range), MasterPolyheed 997 (mid-range), and MasterGlenium 3030NS (full-range) Salmon Bay’s 3 WR’s are: 200N (normal-range), 997 (mid-range), and 3030NS (full-range)
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MasterMatrix VMA 358 organic, viscosity-modifying admixture (VMA) is a ready-to-use, liquid admixture developed for producing concrete with enhanced viscosity and controlled rheological properties. Concrete with MasterMatrix VMA 358 admixture exhibits superior stability, thus increasing resistance to segregation and facilitating placement.
MasterSet R 100 ready-to-use liquid admixture is used for producing more uniform and predictable quality concrete. Placing and finishing requirements are facilitated because this admixture retards setting time
MasterSet Delvo set stabilizer extends the finishability of concrete and gives the cement finisher extra time to work the material. MasterSet Delvo can slow the set time of Ready Mixed Concrete up to several hours if necessary.
Concrete loses volume as the water it contains from the mixing process, hydrates and evaporates. This loss of volume often causes shrinkage cracking. MasterLife SRA 20 is a shrinkage compensating admix intended for use in design mixes having a controlled slump. Concrete mixes containing MasterLife SRA 20; have reduced drying shrinkage cracking and micro-cracking, improved aesthetics, water tightness and overall durability.
MasterCell 30 admixture is a highly concentrated foaming agent for use in producing Controlled Low Strength Materials (CLSM), and engineered, cellular cementitious mixtures (mortar, concrete, or grout) for numerous applications. MasterCell 30 admixture is suitable for use in combination with various types of foam generating equipment, especially equipment that generates foam via air pressure.
Xypex is a unique chemical treatment for the waterproofing, protection and improvement of concrete. It is added to the concrete mix at the time of batching. Xypex contains active chemicals, which react with the moisture in fresh concrete. This reaction generates a non-soluble crystalline formation throughout the pores and capillary tracts of the concrete. In its hardened state the concrete becomes permanently sealed against the penetration of water or liquids. Xypex is available in several formulations; Admix C-1000 is used in standard concrete mixtures, while Admix C-500 is intended for design mixed concrete containing Flyash or slag as admixtures.
Propex’s Fibermesh polypropylene fibers, add tremendous performance enhancements to traditional flatwork concrete. Fibers mixed into concrete (placed horizontally) require no minimum amount of cover and are always positioned in compliance with codes, due to their 3-dimension distribution throughout the concrete mix. Additional benefits include; reduced plastic shrinkage cracking, improved residual strength, impact, shatter and abrasion resistance, reduced water migration and damage from freeze/thaw. Salmon Bay supplies: Fibermesh 150 for architectural concrete placements; Fibermesh 300 as an alternate for secondary concrete reinforcement and Novomesh 850 which is an approved replacement for traditional concrete flatwork reinforcement. Fibermesh 150 for architectural concrete placements; Fibermesh 300 as an alternate for secondary concrete reinforcement and Novomesh 850 which is an approved replacement for traditional concrete flatwork reinforcement.
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Salmon Bay is a supplier of Davis Colors. These synthetic and natural occurring oxide pigments add color to the design of sidewalks, driveways, patios, streets, parking lots and other concrete pavements. Integral colors are mixed into the concrete and require little additional labor to finish. Because integral colors extend throughout the slab, the color shows through even if the slab chips or is exposed. Davis Colors are made with pure, concentrated pigments especially treated for mixing into concrete. They are lightfast, alkali-resistant, weather resistant, and have a recycled content of nearly 60%.