ACS Materials
Changing Concrete
One Cubic Yard at a Time
Compressive Strength Testing
After the recycled glass is processed down to the required fine size, it can now be used as a fly ash substitute in the concrete mix.
ACS’ initial testing has proved that you can achieve desired mix workability qualities and strength in concrete by using a 30% replacement of glass powder. At 28 days, our cylinders achieved their required strength.
Since standard mix designs typically have a 20-25% replacement using fly ash, this is a great benefit to further reduce the OPC (Ordinary Portland Cement) content while not diminishing compressive strength.
Reduced Chloride Permeability
Concrete containing 30% Type GS ground glass as a partial cement
replacement has less chloride permeability long-term than a slag or
fly ash mixture. Having this feature creates a more durable concrete.
ASR Mitigation
ASR (alkali-silica reaction) is caused between the alkaline pore of concrete and a silica aggregate reaction. The silica structure around an aggregate is dissolved through reaction of OH- ions, which creates a gel-like structure that cross-links, coagulates and swells the concrete.
It has been proven that the finer glass powder as cement replacement actually mitigates ASR. At a 30% replacement using glass powder, our expansion percentage falls below the threshold required per ASTM and is improved compared with fly ash.
Supporting Research
Experimental Investigation for Partial Replacement of Cement with Waste Glass Powder on Pervious Concrete
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