Calculation of the environmental impact of the integration of industrial waste in concrete using LCA

Jorge De Brito, Hisham Hafez, Rawaz Kurda, José Silvestre

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

5 Citations (Scopus)

Abstract

The production of concrete, the most used building material globally, is causing severe environmental damage. This is known to be primarily attributed to the production of ordinary Portland cement (OPC). Hence, a vast effort is directed within the concrete industry to find alternatives that would yield a more sustainable concrete product. Concurrently, industrial waste materials (IWM) are increasing in volume and, without a clear valorization path, are mostly wasted in landfills. Although several IWM were researched to determine the possibility of use in concrete, only fly ash (FA), ground granulated blast furnace slag (GGBS) and silica fume (SF) are industrially proven to be effective thus far. Therefore, the aim of this chapter is to assess, through life cycle assessment (LCA), the environmental impacts of producing concrete binders with partial or total replacement of OPC with one or more of the most common IWM.

Although the principle of integrating an IWM as replacement of a material with a significant environmental impact such as OPC seems promising, this chapter showed that some measures are needed to ensure the reliability of the performed LCA study. First of all, the surveyed literature emphasized that the appropriate scope of an LCA study of a concrete product integrating FA, GGBS, or SF is cradle-to-grave. Secondly, the inventory data for the LCA study should be based on an extensive database of secondary data or primary site-specific one. Thus, a database presented by the authors of this study provided an example of a reliable inventory data source. The final criterion that differentiates the LCA methodology when incorporating IWM is the significance of including the impact of transporting the material from the landfill to the concrete batch plant as well as including the impact allocation from previous recycling processes. In this chapter, a case study was prepared using the average values of the inventory data of FA, GGBS, and SF in an LCA, and the environmental impacts of each were compared against OPC. The results show that, per unit mass, only FA actually achieves an environmental saving compared to OPC. However, it is important to highlight that there is an expected decrease in the availability of FA internationally due to the trend of closing down coal-powered electric power plants. Finally, a sensitivity analysis was prepared to highlight the contribution of the amount of allocated impacts from the original processes of IWM production that showed that all three materials would have a lower environmental impact than OPC for an impacts' allocation lower than 1%.
Original languageEnglish
Title of host publicationHandbook of Sustainable Concrete and Industrial Waste Management
Subtitle of host publicationRecycled and Artificial Aggregate, Innovative Eco-Friendly Binders, and Life Cycle Assessment
EditorsFrancesco Colangelo, Raffaele Cioffi, Ilenia Farina
Place of PublicationLondon
PublisherWoodhead Publishing
Chapter26
Pages553-578
Number of pages26
Edition1st
ISBN (Electronic)9780128230138
ISBN (Print)9780128217306
DOIs
Publication statusPublished - 20 Dec 2021

Publication series

NameWoodhead Publishing Series in Civil and Structural Engineering
PublisherElsevier

Fingerprint

Dive into the research topics of 'Calculation of the environmental impact of the integration of industrial waste in concrete using LCA'. Together they form a unique fingerprint.

Cite this