{ "dataset_version": { "id": 3, "label": "v1.0 initial research build", "sha256": "39b09a298de0018be3f245e1a6765062fd7bd70f46ed2f97bf0e992b4d0a7666", "created_at": "2026-09-25 15:42:32" }, "material": { "id": "dedicated", "category": "Dedicated crops", "feedstock": "Industrial hemp (Cannabis sativa L., low-THC fibre varieties)", "product": "Hemp-lime concrete (hempcrete) wall infill", "image": "dedicated.jpg", "declared_unit": "1 m3 of installed hempcrete (wall formulation), about 330 kg/m3 dry", "density_kg_m3": 330, "summary": "Spring-sown hemp is mown, field-retted and baled. A decorticator separates shiv from fibre. Shiv is mixed on site with a formulated lime binder and cast or sprayed around a timber frame.", "params": [ { "id": "ba", "label": "Binder/aggregate mass ratio", "value": 2, "unit": "-", "status": "S", "dq": 2, "sources": [ "S08" ], "note": "Wall formulation per the French professional rules." }, { "id": "wb", "label": "Water/binder ratio", "value": 1.3, "unit": "-", "status": "S", "dq": 2, "sources": [ "S08" ], "note": "" }, { "id": "rho", "label": "Dry density", "value": 330, "unit": "kg/m3", "status": "D", "dq": 3, "sources": [ "S08", "S49" ], "note": "Measured 325-327 kg/m3 after 100 days." }, { "id": "shiv", "label": "Hemp shiv per DU", "value": 110, "unit": "kg", "status": "D", "dq": 3, "sources": [], "note": "= 330/3." }, { "id": "binder", "label": "Lime binder per DU", "value": 220, "unit": "kg", "status": "D", "dq": 3, "sources": [], "note": "= 330 x 2/3." }, { "id": "yield", "label": "Straw yield", "value": 8, "unit": "t/ha", "status": "S", "dq": 2, "sources": [ "S01", "S04" ], "note": "" }, { "id": "nrate", "label": "Mineral N rate", "value": 100, "unit": "kg N/ha", "status": "S", "dq": 2, "sources": [ "S04", "S05" ], "note": "80-100 kg N/ha optimum for biomass." }, { "id": "alloc", "label": "Allocation straw to shiv/fibre/dust", "value": "Mass allocation (75/20/5 in source; equal burden per kg)", "unit": "", "status": "S", "dq": 3, "sources": [ "S03" ], "note": "Economic allocation tested as sensitivity in source." }, { "id": "decort", "label": "Decortication energy", "value": 5.42, "unit": "MJ/kg fibre", "status": "D", "dq": 3, "sources": [ "S02" ], "note": "Midpoint of 1.21-9.63 MJ/kg fibre; fibre fraction 0.31 (midpoint of 20-42%)." } ], "scale": [ { "basis": "DU", "value": 1, "label": "per declared unit" }, { "basis": "ha", "value": 0.01375, "label": "ha of hemp per DU", "status": "D", "note": "= 0.11 t shiv / 8.0 t straw/ha (mass allocation)" }, { "basis": "t", "value": 0.11, "label": "t straw-equivalent per DU", "status": "D", "note": "" } ], "processes": [ { "id": "hem-01", "module": "A1", "stage": "Soil preparation", "name": "Stubble cultivation", "description": "", "flows": [ { "id": "f1", "flow": "Diesel", "amount": 8.5, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "S", "dq": 3, "sources": [ "S34", "S33" ], "note": "Dechaumage classique 7-10 L/ha.", "kind": "input", "range": [ 7, 10 ] } ] }, { "id": "hem-02", "module": "A1", "stage": "Soil preparation", "name": "Ploughing", "description": "", "flows": [ { "id": "f1", "flow": "Diesel", "amount": 15, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "S", "dq": 3, "sources": [ "S34", "S33" ], "note": "Labour 10-20 L/ha.", "kind": "input", "range": [ 10, 20 ] } ] }, { "id": "hem-03", "module": "A1", "stage": "Soil preparation", "name": "Seedbed preparation", "description": "", "flows": [ { "id": "f1", "flow": "Diesel", "amount": 10, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "S", "dq": 3, "sources": [ "S34" ], "note": "", "kind": "input", "range": [ 5, 15 ] } ] }, { "id": "hem-04", "module": "A1", "stage": "Sowing", "name": "Seed supply", "description": "Certified seed of low-THC fibre varieties.", "flows": [ { "id": "f1", "flow": "Hemp seed", "amount": 37.5, "unit": "kg", "basis": "ha", "ef": null, "status": "S", "dq": 2, "sources": [ "S05" ], "note": "35-40 kg/ha; seed burden excluded in Pretot et al. and not available.", "kind": "input" } ] }, { "id": "hem-04b", "module": "A1", "stage": "Sowing", "name": "Seed transport to the farm", "description": "", "flows": [ { "id": "f1", "flow": "Truck transport", "amount": 18.75, "unit": "t.km", "basis": "ha", "ef": "truck", "status": "A", "dq": 4, "sources": [ "S38" ], "note": "= 37.5 kg x 500 km (assumed).", "kind": "input", "range": [ 7.5, 37.5 ] } ] }, { "id": "hem-05", "module": "A1", "stage": "Sowing", "name": "Drilling", "description": "", "flows": [ { "id": "f1", "flow": "Diesel", "amount": 5, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "S", "dq": 3, "sources": [ "S34" ], "note": "Semis en solo 3-7 L/ha.", "kind": "input", "range": [ 3, 7 ] } ] }, { "id": "hem-06", "module": "A1", "stage": "Fertilisation", "name": "Mineral N supply", "description": "", "flows": [ { "id": "f1", "flow": "Ammonium nitrate (as N)", "amount": 100, "unit": "kg N", "basis": "ha", "ef": "n_an", "status": "S", "dq": 2, "sources": [ "S04", "S05" ], "note": "", "kind": "input", "range": [ 80, 100 ] } ] }, { "id": "hem-06b", "module": "A1", "stage": "Fertilisation", "name": "Fertiliser transport to the farm", "description": "Ammonium nitrate from plant to farm by truck.", "flows": [ { "id": "f1", "flow": "Truck transport", "amount": 142.857, "unit": "t.km", "basis": "ha", "ef": "truck", "status": "A", "dq": 4, "sources": [ "S38" ], "note": "= 100 kg N / 0.35 kg N per kg NH4NO3 (stoichiometric) = 286 kg x 500 km (assumed).", "kind": "input", "range": [ 57.1429, 285.714 ] } ] }, { "id": "hem-07", "module": "A1", "stage": "Fertilisation", "name": "Spreading", "description": "", "flows": [ { "id": "f1", "flow": "Diesel, spreader", "amount": 0.85, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "P", "dq": 4, "sources": [ "S34" ], "note": "Proxy: spraying pass 0.4-1.3 L/ha.", "kind": "input", "range": [ 0.4, 1.3 ] } ] }, { "id": "hem-08", "module": "A1", "stage": "Fertilisation", "name": "P and K supply", "description": "K largely returned by leaf fall; P/K often managed at rotation level.", "flows": [ { "id": "f1", "flow": "P2O5 and K2O", "amount": null, "unit": "kg", "basis": "ha", "ef": null, "status": "G", "dq": 5, "sources": [ "S04" ], "note": "", "kind": "input" } ] }, { "id": "hem-09", "module": "A1", "stage": "Field emissions", "name": "Nitrous oxide from N applied", "description": "", "flows": [ { "id": "f1", "flow": "N applied (for N2O)", "amount": 100, "unit": "kg N", "basis": "ha", "ef": "n2o_field", "status": "D", "dq": 2, "sources": [ "S40", "S41" ], "note": "", "kind": "emission", "range": [ 80, 100 ] } ] }, { "id": "hem-10", "module": "A1", "stage": "Field emissions", "name": "Ammonia volatilisation", "description": "0.02 kg NH3 per kg N.", "flows": [ { "id": "f1", "flow": "NH3 to air", "amount": 2, "unit": "kg", "basis": "ha", "ef": null, "status": "S", "dq": 3, "sources": [ "S01" ], "note": "Acidification/eutrophication flow.", "kind": "lci" } ] }, { "id": "hem-11", "module": "A1", "stage": "Field emissions", "name": "Nitrate leaching", "description": "40 kg NO3 per ha.", "flows": [ { "id": "f1", "flow": "NO3 to water", "amount": 40, "unit": "kg", "basis": "ha", "ef": null, "status": "S", "dq": 3, "sources": [ "S01" ], "note": "Eutrophication flow.", "kind": "lci" } ] }, { "id": "hem-12", "module": "A1", "stage": "Crop protection", "name": "Pesticides", "description": "Hemp needs neither insecticide nor fungicide; dense canopy suppresses weeds.", "flows": [ { "id": "f1", "flow": "Pesticides", "amount": 0, "unit": "kg", "basis": "ha", "ef": null, "status": "S", "dq": 3, "sources": [ "S01" ], "note": "", "kind": "input" } ] }, { "id": "hem-13", "module": "A1", "stage": "Harvest", "name": "Mowing (cutter bar)", "description": "", "flows": [ { "id": "f1", "flow": "Diesel", "amount": 4.75, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "P", "dq": 3, "sources": [ "S34", "S33" ], "note": "Proxy: fauchage 3.5-6 L/ha.", "kind": "input", "range": [ 3.5, 7 ] } ] }, { "id": "hem-14", "module": "A1", "stage": "Harvest", "name": "Field retting with turning (2 passes)", "description": "Straw retted on the ground 2-4 weeks.", "flows": [ { "id": "f1", "flow": "Diesel, tedder", "amount": 4, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "P", "dq": 3, "sources": [ "S34", "S33" ], "note": "2 x fanage 1.5-2.5 L/ha.", "kind": "input", "range": [ 3, 5 ] } ] }, { "id": "hem-15", "module": "A1", "stage": "Harvest", "name": "Swathing", "description": "", "flows": [ { "id": "f1", "flow": "Diesel, rake", "amount": 2.25, "unit": "L", "basis": "ha", "ef": "diesel_nr", "status": "P", "dq": 3, "sources": [ "S34" ], "note": "Andainage 1.5-3 L/ha.", "kind": "input", "range": [ 1.5, 3 ] } ] }, { "id": "hem-16", "module": "A1", "stage": "Harvest", "name": "Baling (square bales)", "description": "", "flows": [ { "id": "f1", "flow": "Diesel, baler", "amount": 1.6, "unit": "L", "basis": "t", "ef": "diesel_nr", "status": "S", "dq": 3, "sources": [ "S34" ], "note": "1.2-2 L/t.", "kind": "input", "range": [ 1.2, 2 ] }, { "id": "f2", "flow": "Twine", "amount": null, "unit": "kg", "basis": "DU", "ef": null, "status": "G", "dq": 5, "sources": [], "note": "", "kind": "input" } ] }, { "id": "hem-17", "module": "A1", "stage": "Harvest", "name": "Bale collection and storage", "description": "", "flows": [ { "id": "f1", "flow": "Diesel", "amount": null, "unit": "L", "basis": "t", "ef": "diesel_nr", "status": "G", "dq": 5, "sources": [], "note": "", "kind": "input" } ] }, { "id": "hem-18", "module": "A1", "stage": "Primary processing", "name": "Straw transport to decortication plant", "description": "", "flows": [ { "id": "f1", "flow": "Truck transport", "amount": 3.3, "unit": "t.km", "basis": "DU", "ef": "truck", "status": "A", "dq": 4, "sources": [ "S38" ], "note": "= 0.11 t x 30 km.", "kind": "input", "range": [ 1.1, 8.8 ] } ] }, { "id": "hem-19", "module": "A1", "stage": "Primary processing", "name": "Decortication, screening and dedusting", "description": "Separates shiv, fibre and dust.", "flows": [ { "id": "f1", "flow": "Electricity", "amount": 466.722, "unit": "kWh", "basis": "t", "ef": "elec_fr", "status": "D", "dq": 3, "sources": [ "S02" ], "note": "= 5.42 MJ/kg fibre x 0.31 kg fibre/kg straw / 3.6.", "kind": "input", "range": [ 67.2222, 1123.5 ] } ] }, { "id": "hem-20", "module": "A1", "stage": "Primary processing", "name": "Shiv bagging", "description": "", "flows": [ { "id": "f1", "flow": "Bags / big bags", "amount": null, "unit": "kg", "basis": "DU", "ef": null, "status": "G", "dq": 5, "sources": [], "note": "", "kind": "input" } ] }, { "id": "hem-21", "module": "A1", "stage": "Binder production", "name": "Formulated lime binder manufacture", "description": "Hydrated lime used as proxy for formulated lime (FL A 3.5).", "flows": [ { "id": "f1", "flow": "Lime binder", "amount": 220, "unit": "kg", "basis": "DU", "ef": "lime_hyd", "status": "D", "dq": 3, "sources": [ "S42", "S43", "S09" ], "note": "", "kind": "input" }, { "id": "f2", "flow": "Paper sacks", "amount": null, "unit": "kg", "basis": "DU", "ef": null, "status": "G", "dq": 5, "sources": [], "note": "", "kind": "input" } ] }, { "id": "hem-22", "module": "A2", "stage": "Transport", "name": "Binder from lime works to depot", "description": "", "flows": [ { "id": "f1", "flow": "Truck transport", "amount": 55, "unit": "t.km", "basis": "DU", "ef": "truck", "status": "A", "dq": 4, "sources": [ "S38" ], "note": "= 0.22 t x 250 km.", "kind": "input", "range": [ 22, 110 ] } ] }, { "id": "hem-23", "module": "A3", "stage": "Distribution", "name": "Depot storage of shiv and binder", "description": "", "flows": [ { "id": "f1", "flow": "No process energy", "amount": 0, "unit": "-", "basis": "DU", "ef": null, "status": "I", "dq": 3, "sources": [], "note": "", "kind": "info" } ] }, { "id": "hem-24", "module": "A4", "stage": "Transport", "name": "Depot to construction site", "description": "", "flows": [ { "id": "f1", "flow": "Truck transport", "amount": 16.5, "unit": "t.km", "basis": "DU", "ef": "truck", "status": "A", "dq": 4, "sources": [ "S38" ], "note": "= 0.33 t x 50 km.", "kind": "input", "range": [ 6.6, 49.5 ] } ] }, { "id": "hem-25", "module": "A5", "stage": "Installation", "name": "Mixing on site", "description": "Paddle mixer or spraying machine.", "flows": [ { "id": "f1", "flow": "Electricity or genset diesel", "amount": null, "unit": "kWh", "basis": "DU", "ef": "elec_fr", "status": "G", "dq": 5, "sources": [], "note": "", "kind": "input" }, { "id": "f2", "flow": "Mixing water", "amount": 286, "unit": "L", "basis": "DU", "ef": null, "status": "D", "dq": 2, "sources": [ "S08" ], "note": "= 1.3 x binder; EF negligible/not available.", "kind": "input" } ] }, { "id": "hem-26", "module": "A5", "stage": "Installation", "name": "Formwork and casting / spraying", "description": "Reusable formwork boards; spray rebound losses.", "flows": [ { "id": "f1", "flow": "Formwork and losses", "amount": null, "unit": "-", "basis": "DU", "ef": null, "status": "G", "dq": 5, "sources": [], "note": "", "kind": "input" } ] }, { "id": "hem-27", "module": "A5", "stage": "Installation", "name": "Drying of the wall", "description": "Natural drying; weeks to months.", "flows": [ { "id": "f1", "flow": "No energy input", "amount": 0, "unit": "-", "basis": "DU", "ef": null, "status": "I", "dq": 3, "sources": [], "note": "", "kind": "info" } ] } ], "biogenic": { "dry_mass_kg": 110, "carbon_fraction": 0.45, "co2_kg": 181.5, "status": "A", "sources": [], "note": "Carbon fraction 0.45 assumed for hemp shiv; replace with measured value." }, "info": [ { "label": "Carbonation potential of binder (use stage B1, not in A1-A5)", "value": "up to 130.7 kg CO2 if fully carbonated", "note": "= 0.594 x binder mass.", "sources": [ "S44" ] }, { "label": "Timber frame", "value": "Excluded; model it as a separate element", "note": "", "sources": [] } ], "benchmark": { "label": "No A1-A3 value per m3 retrieved in this version", "value": null, "unit": "", "modules": "", "use_for_residual": false, "sources": [ "S01", "S03" ], "note": "Pretot et al. report results per m2 of wall; convert before comparing." } }, "results": { "total_fossil_gwp": 210.31523728187497, "range": [ 175.0634205890625, 254.28113184375002 ], "modules": { "A1": { "gwp": 204.05898728187498, "lo": 172.5609205890625, "hi": 240.32488184375 }, "A2": { "gwp": 4.8125, "lo": 1.9249999999999998, "hi": 9.625 }, "A3": { "gwp": 0, "lo": 0, "hi": 0 }, "A4": { "gwp": 1.4437499999999999, "lo": 0.5774999999999999, "hi": 4.33125 }, "A5": { "gwp": 0, "lo": 0, "hi": 0 } }, "biogenic_co2_stored": 181.5, "coverage": 0.6666666666666666, "dq_weighted": 2.970150122457789, "residual": null } }