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R-E-D Slag Replacement

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Ground granulated blast furnace slag (GGBFS,) commonly referred to as Slag, is a by-product of pig iron production from blast furnaces.  Consisting primarily of amorphous (glass) silicate and aluminosilicate, Slag makes concrete more enduring and sustainable.   Slag is a supplementary cementitious material (SCM) that increases durability and strength.  Furthermore, Slag decreases thermal cracking, increases resistance to sulfates and chlorides as well as mitigates ASR in concrete. 

R-E-D Industrial Products has developed a Slag replacement from its Re-Act 4™ ground glass pozzolan product line called Re-Act 4™SR which rivals Slag in many ways.  A sustainable and recycled product that allows for lower CO2 concrete and reduction of glass waste in landfills, Re-Act 4™SR can be used anywhere Slag is used: ready mix concrete designs, precast, high-strength concrete projects such as dams and foundations, as well as used in high-volume mortar applications and in paving projects.  The use of Re-Act 4™SR produces a whiter colored finish as compared with Slag and other SCMs such as silica fume and fly ash.

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& Sustainability

We provide real-world solutions to sustainability challenges when using R-E-D Industrial Products Re-Act 4™SR. We stand by the durability of Re-Act 4™SR and its ability to ensure strength into the future. See how Re-Act 4™SR can help you with your next project's sustainability needs by reading the information below. 


Applicability for Sustainability:
  • Increase concrete strength 

  • Reduction permeability 

  • Resistant against corrosion 

  • Reduction of cracking 

  • Stands up against an internal chemical attack

  • Decreased embodied energy 


  • When used in tandem with traditional Portland cement it increases strength extending the life cycle cost

  • Increase structural life when used as a cement replacement, it can be used as a partial or full replacement of cement cutting back on greenhouse gas emissions

  • Increases concrete longevity, especially in areas where concrete is surrounded by or subject to high levels of water or corrosive natural elements such as bridges, tunnels, and dams

  • Its low permeability protects reinforcing steel and rebar from internal chemical attacks 


  • Decreased embodied energy (the amount of energy used from production to transportation and delivery)

  • Decreases the urban heat island effect which is a direct contributor to increased energy costs and air pollution

  • Reduction of greenhouse gas emissions that contribute to climate change 

  • Avoids having a byproduct that is otherwise useless from being landfilled and increasing industry waste 

  • Overall reduction of the environmental impact of concrete mixtures


Sustainability Fact: issues related to urban heat islands jeopardize more people in the United States than hurricanes, floods, tornadoes, and lightning combined [1].


[1] “Urban Heat Islands.” The Nature Conservancy, 22 July 2019, 

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