Docket #: S19-518
High quality, low carbon cement
Stanford researchers have developed a high-quality cement with a 70% reduction in CO2 emissions with no upcycling. Cement is the second most consumed resource in the world, accounts for 8% of the world's CO2 emissions, is tough to recycle, and has a lifetime of about 50-100 years or less. In response, the Rocks and Geomaterials Laboratory at Stanford has engineered a low to near-to-zero carbon footprint cement clinker through a cement-processing technique that replaces limestone with carbon-free volcanic rocks and mimics how fibrous microstructures effectively reinforce rocks. The new process significantly slashes carbon dioxide emissions during manufacturing allowing for reductions of 70% of CO2 emissions, and can potentially increase durability.
Stage of Research
Researchers are in the prototype phase and testing the properties.
Applications
- Hydraulic cement construction particularly suited to harsh environments:
- Areas that experience seismic ground shaking
- Wellbore casings subject to injection of CO2, acid fluids, or re-injection of wastewater fracking
- Planetary shelters and habitats of tomorrow
Advantages
- 70% reduction in CO2 emissions without relying on carbon upcycling:
- Pyroprocessing of this alternative raw material leads to no carbon footprint
- No need to build new cement plants for carbon capture and sequestration
- Exceptional physico-chemical properties making it suited to harsh environments:
- High compressive strength
- Expanded durability - naturally reinforced, binds well, and absorbs strain energy (seismic shaking)
- High thermal stability
- High chemical resilience and resistant to acid fluids - minimal alkali-silica reaction (ASR) expected due of the lack of silica in the clinker
Publications
- Jackson MacFarlane, Tiziana Vanorio, John Oleson, Gordon Williams, Dante Zakhidov, Anthony Clark, and Alberto Salleo. "The Source for Lime in Roman Concrete: Igneous or Sedimentary Rock? A Path Toward Sustainable Cements," forthcoming.
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