Process information
| Key Data Set Information | |||
| Location | RO | ||
| Reference year | 2024 | ||
| Name |
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| Use advice for data set | Scope: The life cycle assessment is based on the consumption data of the Romanian Xella aerated concrete plant in Paulesti and the data base for the year 2022. System boundary: Type of EPD: cradle-to-gate with options. Description of life cycle phases: Product stage (A1–A3) Raw material provisioning and truck transport of the raw materials to the plant. Production inputs, in particular provisioning and use of energy carriers and auxiliary materials, as well as packaging material. Treatment of production waste and wastewater. Construction stage of the building (A4–A5) Module A4: Truck transport to the construction site (100 km). Transport distance can, where applicable, be adjusted at the building level (e.g., for 200 km actual transport distance: multiply the LCA values by the factor 2). Module A5: Thermal packaging treatment and resulting credits in Module D. Offcuts were not considered, as these depend strongly on the building context. Offcuts can be approximated using the declared values for the production stage (e.g., 5% offcuts: multiply the LCA values by the factor 0.05). The installation of the products themselves is typically manual (no loads). Mortar is not considered in this EPD. Use stage (B1) Recarbonation of reactive product constituents (e.g., CaO). A recarbonation rate of 95% is assumed (Walther 2022). End-of-life stage (C1–C4) Module C1: Mechanical demolition (excavator). Module C2: Truck transport to waste processing (50 km). Transport distance can, where applicable, be adjusted at the building level (e.g., for 100 km actual transport distance: multiply the LCA values by the factor 2). Module C3: (Scenario: material recycling): Waste processing and material recycling as fill material (including credits for substitution of gravel in Module D). Module C4: (Scenario: landfilling): Average emissions from landfilling. Credits and burdens outside the system boundary (D) Credits from avoided costs through substitution of gravel as fill material (from Module C3) and credits for energy substitution from packaging treatment. | ||
| Technical purpose of product or process | Unreinforced blocks for masonry, monolithic, load-bearing and non-load-bearing walls. Direct contact with water is avoided in construction practice as specified. | ||
| Classification |
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| General comment on data set | The aforementioned products are unreinforced building blocks of various formats made from aerated concrete. Aerated concrete belongs to the group of porous autoclaved lightweight concretes. | ||
| Copyright | Yes | ||
| Owner of data set | |||
| Quantitative reference | |||
| Reference flow(s) |
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| Biogenic carbon content |
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| Time representativeness | |||
| Data set valid until | 2029 | ||
| Technological representativeness | |||
| Technology description including background system | Der gemahlene Quarzsand wird mit Kalk, Zement und zerkleinertem Porenbeton-Recyclingmaterial, unter Zugabe von Wasser und Aluminiumpulver oder -paste, in einem Mischer zu einer wässrigen Suspension gemischt und in Gießformen gegossen. Das Wasser löscht unter Wärmeentwicklung den Kalk. Das Aluminium reagiert im alkalischen Milieu. Dabei bildet sich gasförmiger Wasserstoff, der die Poren in der Masse erzeugt und ohne Rückstände entweicht. Die Poren besitzen meist einen Durchmesser von 0,5 – 1,5 mm und sind ausschließlich mit Luft gefüllt. Nach dem ersten Abbinden entstehen halbfeste Rohblöcke, aus denen maschinell und mit hoher Genauigkeit die Porenbetonbauteile geschnitten werden. Die Ausbildung der endgültigen Porenbetoneigenschaften erfolgt während der anschließenden Dampfhärtung über 5 – 12 Stunden bei etwa 190 °C und einem Druck von ca. 12 bar in Dampfdruckkesseln, den sog. Autoklaven. Hier bilden sich aus den eingesetzten Stoffen Calcium-Silikathydrate, die dem in der Natur vorkommenden Mineral Tobermorit entsprechen. Die Reaktion des Materials ist mit der Entnahme aus dem Autoklav abgeschlossen. Der Dampf wird nach Abschluss des Härtungsprozesses für weitere Autoklavzyklen verwandt. Das anfallende Kondensat wird als Prozesswasser genutzt. Auf diese Weise wird Energie eingespart und eine Belastung der Umwelt mit heißem Abdampf und Abwasser vermieden. Porenbeton-Bausteine werden anschließend auf Holzpaletten gestapelt und in recycelbare Schrumpffolie aus Polyethylen (PE) eingeschweißt. Technical data: See the Declaration of Performance for the respective product. The following table includes general data. Declared unit: The declared unit is 1 m unreinforced autoclaved aerated concrete of the raw density class 0.5 with a gross density of 486 kg/m. The average gross density was determined by averaging the data from the factory production control (FPC) in the reference year. | ||
Modelling and validation
| Subtype | specific dataset | ||||
| LCA methodology report | |||||
| Data sources, treatment and representativeness | |||||
| Documentation of data quality management | |||||
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| Compliance Declarations | |||||
| Compliance |
Compliance system name
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Approval of overall compliance
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Nomenclature compliance
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Methodological compliance
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Review compliance
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Documentation compliance
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Quality compliance
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| Compliance |
Compliance system name
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Approval of overall compliance
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Nomenclature compliance
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Methodological compliance
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Review compliance
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Documentation compliance
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Quality compliance
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Administrative information
| Commissioner and goal | |
| Commissioner of data set | |
| Data generator | |
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| Data entry by | |
| Time stamp (last saved) | 2024-06-26T00:00:00 |
| Data set format(s) | |
| Publication and ownership | |
| UUID | f6ec0adc-f1d2-453b-b834-f34bac094842 |
| Date of last revision | 2024-06-26T10:42:00+01:00 |
| Data set version | 00.02.001 |
| Registration authority | |
| Registration number | EPD-XEL-20240215-IBA1-DE |
| Owner of data set | |
| Copyright | Yes |
| License type | Free of charge for all users and uses |
| Access and use restrictions | None |
Environmental indicators
Indicators of life cycle