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Life cycle assessment (LCA )

Life cycle assessment (LCA ). LCA can provide quantities A protocol to assess the environmental, economic, and social impacts of an industrial system.

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Life cycle assessment (LCA )

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  1. Life cycle assessment (LCA) • LCA can provide quantities • A protocol to assess the environmental, economic, and social impacts of an industrial system. • The life cycle of the industrial system extends from cradle-to-grave: from materials acquisition and production, through manufacturing, system use and maintenance, and finally through the end of the system’s life.

  2. refinery transport transport oil extraction other inputs transport Aggregate Quarry hma plant water fuel other outputs transport placement An example of LCA processes, inputs and outputs to consider for HMA paving. waste emissions hazardous waste

  3. For a given unit of production (e.g., 1 lane-mile of pavement) a typical LCA gives a range of outputs. • Amount of materials used (tonnes) • Total energy use (MJ) • Water consumption (kg) • Emissions • Global warming potential (tonnes of CO2 equivalent) • Nitrogen oxides – NOx(kg) • Sulfur dioxide – SO2 (kg) • Particulate matter – PM10 (kg) • Carbon Monoxide – CO (kg) • Toxic things • Human toxicity potential • Mercury – Hg (g) • Lead – Pb (g) • Hazardous waste (kg)

  4. Things people always argue about when looking at LCA data. • Functional unit definition • Structural design • Materials makeup • Data sources • Asphalt in the mix • Lack of good data (especially for HMA options) • Non-specific data • Life cycle • Number and timing of rehabilitation options • Pavement condition

  5. HMA PCC 2” lift of SMA 2” lift of ½” Superpave 3” lift of ½” Superpave 13” PCC 3” lift of ½” Superpave 3” lift of ½” Superpave CSOL 2” lift of SMA 4” lift of ¾” Superpave 2” lift of ½” Superpave 10” of aggregate base(multiple lifts) EXISTING PAVEMENT Petromat Geotex. 2” lift of ½” Superpave 6” lift of CSTC 9” PCC Cracked and seated Subbase 9” PCC Subbase Subbase Subbase

  6. Contributions from PCC remove and replace

  7. Contributions from HMA remove and replace

  8. Contributions from CSOL

  9. Makeup of Impact Assessment

  10. Impact Assessment Global Warming Potential Energy Use

  11. Impact Assessment Eutrophication Acidification

  12. Impact Assessment Human Health Criteria Air Photochemical Smog

  13. Total Energy Use

  14. Global Warming Potential

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