Carbon footprint

A carbon footprint describes the greenhouse-gas impact of a clearly defined system, such as a deconstruction process, a construction project or a specified unit of work. Concrete pulverizers, hydraulic rock and concrete splitters, hydraulic power packs, shears and tank cutters may form part of the system under study. Their use does not by itself establish a lower carbon footprint; the result must be calculated for the specific task.

System boundary and functional unit

Define the subject, period and system boundary before calculation. The boundary may cover site operation only or include manufacture, provision, use, transport, processing and end of life. Comparisons are meaningful only when they use the same functional unit, for example 1 m³ of reinforced concrete with a defined reinforcement ratio or 1 t of natural stone under comparable conditions.

Data required

• electricity and fuel consumption, including energy source and data period
• operating hours, utilization and output of the equipment used
• transport masses, distances, vehicle utilization and recovery routes
• material flows, wear parts, auxiliary materials and downstream processing
• recognized current emission factors and documented assumptions

ISO 14040/14044 and ISO 14067 may provide methodological orientation for life-cycle assessment, while EN 15804 may be relevant for construction products. The suitable method depends on the assessment object and intended use of the result.

Compare methods consistently

Concrete pulverizers, splitting tools, impact methods, sawing and thermal cutting differ in energy demand, duration, ancillary processes and material output. This does not establish a general ranking. Each option must use identical system boundaries, the same work task and comparable quality requirements. Rework, ventilation, dust suppression, transport and actual recovery should be included where they fall within the defined boundary.

Assess local effects separately

Dust, noise and vibration are important project-specific environmental and occupational-safety parameters, but they are not greenhouse-gas emissions. Electric power packs produce no direct combustion-exhaust emissions at the point of use; electricity mix, power demand, operating time and relevant upstream processes still count in a carbon-footprint assessment.

Report results transparently

A robust result identifies the functional unit, system boundary, data sources, emission factors, data date and material uncertainties. Claims such as “lower CO₂” or “better carbon footprint” require a documented comparison. Without such data, communication should describe only the parameters measured and assessed.

Practical checklist

1. Define the task and comparison options unambiguously.
2. Record energy, quantity, transport and material data.
3. Use the same boundaries and emission factors for all options.
4. Report local impacts separately from greenhouse-gas effects.
5. Document assumptions, uncertainties and the data date.
6. Obtain technical and legal approval before publishing an environmental claim.