Ecoefficient Cementitious Materials with High Levels of Portland Cement Replacement Using Blast Furnace Slag
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 8
Abstract
The portland cement (PC) industry is responsible for approximately 7% of all carbon dioxide () emissions in the world. Blast furnace slag (BFS) has been increasingly used as a substitute for PC, due to the efficient disposal of steel industry waste and reductions in emissions. The present work investigated the environmental benefits of cementitious materials with large volumes of BFS (up to 90% PC replacement for the S90 mixture) and the influence on porosity and compressive strength. By X-ray computed microtomography and mercury intrusion porosimetry, pore size distribution was assessed. Porosity was also evaluated by water absorption. The environmental impacts were investigated by analyzing the embodied emissions () and embodied energy (EE) by using life cycle assessment methodology. Reductions of around 40% in the compressive strength of S90 were found, while reductions in EE and were above 80%. The S90 showed higher porosity at the age of 28 days, but then promoted a more active pore closing effect over time, being nevertheless feasible for use in terms of porosity. The use of S90 is expected to increase durability due to its thinner porous matrix, and contribute to reducing environmental impact and advancing cleaner production.
Practical Applications
Today, there is a global call to action to end poverty, protect the environment and climate, and ensure that people everywhere can enjoy peace and prosperity. Objectives set for the United Nations aim to help developing countries, like Brazil, achieve the 2030 Agenda for Sustainable Development. A highlight is given to “Sustainable Development Goal 9: Industry, Innovation and Infrastructure” (SDG 9), which aims to build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation. The portland cement (PC) industry is responsible for approximately 7% of all carbon dioxide () emissions in the world. The study carried out here points to the feasibility of using blast furnace slag (BFS) to replace up to 90% of PC clinker, and demonstrates the environmental advantages in terms of reducing emissions and energy consumption. In this context, the use of clinkers with higher concentrations of BFS, up to 90%, has emerged as a way to contribute to the sustainable development proposed by SDG 9.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors express their gratitude to ArcelorMittal Tubarão for its donations of blast furnace slag. The authors also acknowledge the contributions of the technicians and managers of the Complexo Central de Apoio a Pesquisa (COMCAP) and Laboratório de Construção Civil at State University of Maringá, Central Multiusuária de Laboratórios de Pesquisa from UEL (LARX and LMEM), Laboratório de Construção Civil at State University of Londrina, and MicroService and Technological University of Paraná (Apucarana), which offered their work for the development of the present study.
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© 2024 American Society of Civil Engineers.
History
Received: Jul 20, 2023
Accepted: Jan 23, 2024
Published online: May 30, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 30, 2024
ASCE Technical Topics:
- [Inorganic compounds]
- Air pollution
- Blasting effects
- Carbon compounds
- Carbon dioxide
- Cement
- Chemicals
- Chemistry
- Compressive strength
- Concrete
- Continuum mechanics
- Dynamics (solid mechanics)
- Emissions
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Material mechanics
- Material properties
- Materials engineering
- Organic compounds
- Pollution
- Porosity
- Slag
- Solid mechanics
- Strength of materials
- Structural dynamics
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