Industrial transitionsCompletedPeer reviewed

Separating real from apparent innovation: 24 low-carbon cement and concrete technologies assessed

An assessment of 24 low-carbon cement and concrete technologies in five families. It separates levers that cut emissions quickly and at scale from those with hidden externalities, and turns the result into a purchasing strategy.

Project facts

ProgrammeIndustrial transitions · also shown in Measuring transitions
StatusCompleted · Peer reviewed What the status labels mean
MethodsTechnology and sector foresight · Environmental accounting and LCA
ScaleSector
GeographyGlobal cement and concrete industry

The question

Which cement and concrete technologies can cut emissions quickly and at scale, which carry hidden externalities or rebound effects likely to be re-rated as harmful, and which could transform the industry by mid-century?

What the figures leave out

The life-cycle assessment of a "low-carbon" cement often leaves out the emissions of chemical activators, the limited supply of the industrial by-products it relies on, and the carbon cost of biomass used in its production. When a by-product runs short, clinker production returns elsewhere and the saving disappears.

Approach

Each technology was assessed on its chemistry (reaction kinetics, microstructure), on the mineral resources it needs (distribution and grade of deposits) and on its technology and commercial readiness. Each was then tested against six systems archetypes, among them fixes that fail and shifting the burden, and against supply limits and rebound. The result is an emission-reduction range for 2030, 2040 and 2050 and a class for each technology: maladaptive, incremental, scalable or disruptive.

24 TECHNOLOGIES · 5 FAMILIESAlternative clinkers and chemistriesSupplementary cementitious materialsAlkali-activated materialsCarbon capture, use and storageCarbon mineralizationFOUR LENSESCHEMISTRYMINERALRESOURCESREADINESSSYSTEMSARCHETYPESLEFT OUT OF A SINGLE LCA FIGUREactivator emissions · by-product supplybiomass carbon · reboundFOUR CLASSES · 2030, 2040, 2050MaladaptiveIncrementalScalableDisruptive 24 TECHNOLOGIES · 5 FAMILIESAlternative clinkers and chemistriesSupplementary cementitious materialsAlkali-activated materialsCarbon capture, use and storageCarbon mineralizationFOUR LENSESCHEMISTRYMINERAL RESOURCESREADINESSSYSTEMS ARCHETYPESLEFT OUT OF A SINGLE LCA FIGUREactivators · by-product supplybiomass carbon · reboundFOUR CLASSES · 2030, 2040, 2050MaladaptiveIncrementalScalableDisruptive
FIG. 1 · METHOD SCHEMATIC · NO VALUES · Diagram of the assessment method: 24 technologies in five families, assessed through four lenses and sorted into four classes.STATUS · COMPLETED

Scope

24technologies assessed
5families: alternative clinkers and chemistries; supplementary cementitious materials; alkali-activated materials; carbon capture, use and storage; carbon mineralization
3time horizons: 2030, 2040, 2050

Where it stands

Completed

Completed. The technology data sheets were finalized after peer review. The assessment was carried out for an industrial client; its detailed results are confidential.

The decision it informs

Where a developer, contractor or public buyer should direct its purchasing: support high-readiness, low-risk levers now; avoid options likely to be re-rated as harmful; back transformative pathways early.

INSTRUMENTS · A classification of technologies and a purchasing strategy for the demand side.

What the work required

  • Cement chemistry and mineral resources
  • Reading omissions in attributional life-cycle assessment
  • Classifying options as maladaptive, incremental, scalable or disruptive
  • Turning technology foresight into a purchasing strategy

Choosing materials, setting a purchasing policy or assessing a low-carbon claim?

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