Greenstone Pushes Alkali-Activated Cement

A recent article posted on the LiveScience website discusses attempts by a group of researchers to promote a “greener” cement.  The researchers at Drexel University (located about 90 minutes’s from Bridge Gap Engineering’s office in the Lehigh Valley) have developed an alkali-activated cement composed of limestone, ground granulate blast-furnace (GGBF) slag, and soda ash.  Research performed by the group indicates that a similar mixture may have been used in pouring some components of the pyramids in Egypt.  The mix is literally green when poured, and cures to a gray/white finish.  The technology has been spun into a new company, Greenstone Technologies, LLC, which is promoting the lower carbon emissions in production, and pushing the material as a greener alternative to OPC.



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  1. Flyash + Alumina Waste = Geopolymer « Bridge Gap Engineering

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