{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T23:14:29Z","timestamp":1773098069964,"version":"3.50.1"},"reference-count":27,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T00:00:00Z","timestamp":1761091200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Waste"],"abstract":"<jats:p>Steel consumption in the construction sector is one of the main contributors to global greenhouse gas emissions. Therefore, developing processes for the reuse of steel-based products with lower environmental impacts is essential for the sustainability of the construction sector. One example is the reuse of metal road guardrail beams on highways. This study investigated the environmental sustainability of a reconditioning process for such beams, instead of using new guardrails. The environmental impacts of the process were studied and compared with the impacts of the traditional production process using a Life Cycle Assessment (LCA) approach. This study revealed that most of the impacts of the reconditioning process derive from the use of electricity. The comparison with the traditional beam production process revealed that when primary raw materials are replaced by reused raw materials, the environmental impacts associated with the production process decrease significantly. Of the 19 impact indicators assessed, 18 were lower, and 17 had a drop of more than 90 percent compared to the traditional production process. The results indicate that the reconditioning process has the potential to significantly reduce environmental impacts by avoiding the consumption and transportation of primary raw materials, which were identified as the main sources of impacts in the traditional production process, as well as minimizing waste generation.<\/jats:p>","DOI":"10.3390\/waste3040036","type":"journal-article","created":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T02:03:48Z","timestamp":1761185028000},"page":"36","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Life Cycle Assessment of Reconditioned Guardrail Beams"],"prefix":"10.3390","volume":"3","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-1301-714X","authenticated-orcid":false,"given":"Daniel","family":"Mattos","sequence":"first","affiliation":[{"name":"Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Department of Geosciences, Environment and Spatial Planning, Faculty of Sciences of University of Porto, Rua do Campo Alegre s\/n, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8478-3441","authenticated-orcid":false,"given":"Joaquim C. G.","family":"Esteves da Silva","sequence":"additional","affiliation":[{"name":"Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Department of Geosciences, Environment and Spatial Planning, Faculty of Sciences of University of Porto, Rua do Campo Alegre s\/n, 4169-007 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5647-8455","authenticated-orcid":false,"given":"Luis","family":"Pinto da Silva","sequence":"additional","affiliation":[{"name":"Chemistry Research Unit (CIQUP), Institute of Molecular Sciences (IMS), Department of Geosciences, Environment and Spatial Planning, Faculty of Sciences of University of Porto, Rua do Campo Alegre s\/n, 4169-007 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,22]]},"reference":[{"key":"ref_1","unstructured":"Mattos, D., Silva, J., and Silva, L. (2024). Life Cycle Assessment of Safety Metal Guard Rail Beams. [Master\u2019s Thesis, Porto University]. Available online: https:\/\/repositorio-aberto.up.pt\/handle\/10216\/160337."},{"key":"ref_2","unstructured":"(2024, January 13). Eurostat, Statistics for the European Green Deal. Available online: https:\/\/ec.europa.eu\/eurostat\/cache\/egd-statistics\/."},{"key":"ref_3","unstructured":"The European Steel Association (2024, February 23). European Steel in Figures. Available online: https:\/\/www.eurofer.eu\/publications\/brochures-booklets-and-factsheets\/european-steel-in-figures-2023."},{"key":"ref_4","unstructured":"International Energy Agency (2024, February 23). Iron and Steel Roadmap\u2014Towards more sustainable steelmaking. Available online: https:\/\/www.iea.org\/reports\/iron-and-steel-technology-roadmap."},{"key":"ref_5","unstructured":"Boehm, S., Jeffery, L., Hecke, J., Schumer, C., Jaeger, J., Fyson, C., Levin, K., Nilsson, A., Naimoli, S., and Daly, E. (2024, February 23). State of Climate Action 2023, Systems Change Lab. Available online: https:\/\/www.wri.org\/research\/state-climate-action-2023?utm_source=vancouver%20is%20awesome&utm_campaign=vancouver%20is%20awesome%3A%20outbound&utm_medium=referral."},{"key":"ref_6","unstructured":"Lima, P.M.H. (2006). Functional and Structural Behavior of Safety Barriers. [Master\u2019s Thesis, Porto University]. Available online: https:\/\/repositorio-aberto.up.pt\/handle\/10216\/11247."},{"key":"ref_7","unstructured":"American Association of State Highway and Transportation Officials (2011). Roadside Design Guide, Amer Assn of State Hwy. [4th ed.]."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Suer, J., Traverso, M., and J\u00e4ger, N. (2022). Review of Life Cycle Assessments for Steel and Environmental Analysis of Future Steel Production Scenarios. Sustainability, 14.","DOI":"10.3390\/su142114131"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"103958","DOI":"10.1016\/j.ijggc.2023.103958","article-title":"Cost and life cycle analysis for deep CO2 emissions reduction of steelmaking: Blast furnace-basic oxygen furnace and electric arc furnace technologies","volume":"128","author":"Zang","year":"2023","journal-title":"Int. J. Greenh. Gas Control"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"235","DOI":"10.1016\/j.jclepro.2013.04.031","article-title":"Life cycle assessment of steel production in Poland: A case study","volume":"54","year":"2013","journal-title":"J. Clean. Prod."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Renzulli, P., Notarnicola, B., Tassielli, G., Arcese, G., and Di Capua, R. (2016). Life Cycle Assessment of Steel Produced in an Italian Integrated Steel Mill. Sustainability, 8.","DOI":"10.3390\/su8080719"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"121697","DOI":"10.1016\/j.jclepro.2020.121697","article-title":"Environmental impact evaluation of an iron and steel plant in China: Normalized data and direct\/indirect contribution","volume":"264","author":"Liang","year":"2020","journal-title":"J. Clean. Prod."},{"key":"ref_13","unstructured":"Hyde, J., and Engel, P. (2000). Lifecycle Assessment Study\u2014Guardrail Offset Blocks: Recycled Plastic, Steel, and Pressure-Treated Wood Blocks."},{"key":"ref_14","first-page":"58","article-title":"Life Cycle Assessment of CCA-Treated Wood Highway Guard Rail Posts in the US with Comparisons to Galvanized Steel Guard Rail Posts","volume":"3","author":"Bolin","year":"2013","journal-title":"J. Transp. Technol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1007\/s40095-014-0155-8","article-title":"Embedding \u2018\u2019roadside equipment\u2019\u2019 in the environmental assessment of transportation system: The case of safety barriers","volume":"6","author":"Guerrieri","year":"2015","journal-title":"Int. J. Energy Environ. Eng."},{"key":"ref_16","first-page":"1726","article-title":"Modelling and Analysis of Carbon Emission in Life Cycle of Wave Beam Steel Guardrail","volume":"Volume 259","author":"Liu","year":"2024","journal-title":"Proceedings of the 2023 4th International Conference on Management Science and Engineering Management (ICMSEM 2023)"},{"key":"ref_17","unstructured":"NRS Nordic Road Safety (2024, April 05). Environmental Product Declaration\u2014Guardrail for Traffic Barriers. Registration Number S-P-06849, 2022; EPD International AB. Available online: https:\/\/environdec.com\/library\/epd6849."},{"key":"ref_18","unstructured":"(2006). Environmental Management\u2014Life Cycle Assessment\u2014Principles and Framework (Standard No. ISO 14040:2006)."},{"key":"ref_19","unstructured":"(2006). Environmental Management\u2014Life Cycle Assessment\u2014Requirements and Guidelines (Standard No. ISO 14044:2006)."},{"key":"ref_20","unstructured":"Ioannidou, D., Foster, C., Symeonidis, A., M\u00fcller, J., Bourgault, G., FitzGerald, D., and Moreno Ruiz, E. (2021). Documentation for the \u2018Allocation, Cut-Off, EN15804\u2019 System Model, Ecoinvent Association. Available online: https:\/\/ecoquery.ecoinvent.org\/3.8\/EN15804\/reports\/."},{"key":"ref_21","unstructured":"(2019). Sustainability of Construction Works\u2014Environmental Product Declarations\u2014Core Rules for the Product Category of Construction Products (Standard No. EN 15804:2012+A2)."},{"key":"ref_22","unstructured":"(2024). PCR 2019:14, The International EPD System. Available online: https:\/\/www.environdec.com\/pcr-library\/pcr_9c13b1b9-4397-4d7d-b0f4-75ea56a30a88\/."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"012015","DOI":"10.1088\/1755-1315\/1078\/1\/012015","article-title":"Evaluating \u2018reuse\u2019 in the current LCA framework\u2014Impact of reuse and reusability in different life cycle stages","volume":"1078","author":"Etiene","year":"2022","journal-title":"IOP Conf. Ser. Earth Environ. Sci."},{"key":"ref_24","unstructured":"World Steel Association (2023). World Steel in Figures Report, World Steel Association. Available online: https:\/\/worldsteel.org\/data\/world-steel-in-figures\/world-steel-in-figures-2023\/."},{"key":"ref_25","unstructured":"(2024, June 01). International Energy Agency. Available online: https:\/\/www.iea.org\/countries\/portugal\/electricity."},{"key":"ref_26","unstructured":"(2024, June 01). International Energy Agency. Available online: https:\/\/www.iea.org\/countries\/sweden\/electricity."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"110433","DOI":"10.1016\/j.rser.2020.110433","article-title":"Improving the accuracy of electricity carbon footprint: Estimation of hydroelectric reservoir greenhouse gas emissions","volume":"136","author":"Levasseur","year":"2021","journal-title":"Renew. Sustain. 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