Our customers draw on our in-house sales staff for advice and assistance on admixture chemistry, cement chemistry, concrete chemistry, and on mix optimization.
- Fly ash in the mix replaces Portland Cement, producing big savings in concrete materials costs.
- Fly ash is an environmentally-friendly solution that meets or exceeds performance specifications. Fly ash can contribute to LEED(Leadership in Energy and Environmental Design) points.
- For each ton of Fly Ash used:
- Enough energy is saved to provide electricity to a home for 24hrs.
- Landfill space saved equals approximately 450 days worth of trash produced by the average American.
- Reduced CO2 emissions equal to that produced by driving a car for two months.
Concrete in its hardened state — with fly ash — shows improved performance with:
- Greater strength. Fly ash increases in strength over time, continuing to combine with free lime.
- Decreased permeability. Increased density and long-term pozzolanic action of fly ash, which ties up free lime, results in fewer bleed channels and decreases permeability.
- Increased durability. The lower permeability of concrete with fly ash also helps keep aggressive compounds on the surface, where destructive action is lessened. Fly ash concrete is also more resistant to attack by sulfate, mild acid, and soft (lime hungry) water.
- Reduced alkali silica reactivity. Fly ash combines with alkalis from cement that might otherwise combine with silica from aggregates, thereby preventing destructive expansion.
- Reduced heat of hydration. The pozzolanic reaction between fly ash and lime generates less heat, resulting in reduced thermal cracking when fly ash is used to replace a percentage of Portland Cement.
- Reduced efflorescence. Fly ash chemically binds free lime and salts that can create efflorescence. The lower permeability of concrete with fly ash can help to hold efflorescence-producing compounds inside the concrete.
The ball-bearing effect of fly ash in concrete creates a lubricating action when concrete is in its plastic state. This means:
- Increased workability. Concrete is easier to place with less effort, responding better to vibration to fill forms more completely.
- Increased ease of pumping. Pumping requires less energy; longer pumping distances are possible.
- Improved finishing. Sharp, clear architectural definition is easier to achieve, with less worry about in-place integrity.
- Reduced bleeding. Fewer bleed channels decreases porosity and chemical attack. Bleed streaking is reduced for architectural finishes. Improved paste to aggregate contact results in enhanced bond strengths.
- Reduced segregation. Improved cohesiveness of fly ash concrete reduces segregation that can lead to rock pockets.
- Reduced slump loss. More dependable concrete allows for greater working time, especially in hot weather.
For concrete industry users and specifiers, Separation Technologies and ProAsh®, provides a consistent, much-needed raw material to improve concrete and lower Portland cement needs and CO2 emissions per unit produced.
- We manufacture ProAsh® by using our patented processing technology which produces a high quality fly ash.
- ProAsh®, a consistent and dependable fly ash, increases the strength and durability of concrete while reducing customer costs by replacing cement.
- ProAsh® can contribute to LEED (Leadership in Energy and Environmental Design) points.
The most consistent and reliably available low-carbon fly ash, allowing for better control of concrete mixtures, fewer batch-plant and job-site delays, fewer rejected loads of concrete, and superior, predictable in-place concrete properties.
Our unprocessed premium fly ash is precipitator-managed for reliability in concrete mixtures, and when mixed with Portland cement in sub-grade stabilization, reclamation of asphalt highways, road-base stabilization, and mine and land reclamation.
By meeting the highest quality standards of cement replacement with ProAsh®, concrete producers now have a value-added product to offer their customers. Greencrete® offers quality and durability to meet or exceed building specifications while utilizing recycled materials in bulk or package.
Our patented electrostatic separation system consistently removes high-carbon particles from fly ash and enables the recovery of BTUs lost to NO x emission controls. The option to use this otherwise wasted material provides power producers a 100% solution to their fly ash management program and can measurably add value to coal use.
Associations & Approvals
Concrete Industry Associations and Specifications
- American Coal Ash Association (ACAA)
- American Coal Council (ACC)
- American Concrete Contractors Association (ACCA)
- American Concrete Institute (ACI)
- American Concrete Pavement Association (ACPA)
- American Society for Testing and Materials (ASTM)
- Cement Association of Canada (CAC)
- National Ready Mixed Concrete Association (NRMCA)
- Portland Cement Association (PCA)
- Precast/Prestressed Concrete Institute (PCI)
Separation Technologies’ ProAsh® meets all ASTM C-618 specifications. In addition, Separation Technologies has worked closely with ACAA and ASTM to promote increased utilization of fly ash in the construction of durable, high quality concrete structures with reduced life-cycle costs.