A
Wayne State University researcher has developed a novel method to make
sustainable Hybrid Green Cements (HGC) from low cost minerals and waste minerals
such as coal, ash, bio-mass ash, or mine tailings. Key issues that the researcher has
identified include optimal ranges of hybrid mix compositions, processing, and
curing conditions.
HGC
provides better alternatives to Portland cement in several aspects. By using waste materials and active
mineral components that can be calcined at much lower temperatures than those of
Portland cement, the new green cements are energy efficient and emit much less
CO2 from their production. Green cements also have a
significant absorption capability of ambient CO2 by the carbonation
process. Compared to Portland
cement, the new hybrid green cements have very high early strengths and their
long term strengths are the same or superior to those of Portland cement, with a
significantly higher ductility.
Commercial
Applications:
·
HGCs
can be used as partial or complete substitutes for Portland cement in all facets
of concrete applications
Competitive
Advantages:
·
Significant
reduction in the amount of energy consumed during cement manufacturing
processes
·
Significant
reduction in the amount of CO2 emitted during the cement
manufacturing process (3-9 times
less than is emitted during production of Portland cement)
·
HGCs
have strengths that are similar or superior to Portland cement, while having a
dutility that is 2-3 times better
·
More
sustainable and duralbe alternative to Portland cement
Patent
Status:
Patent
pending