Cited by 73Concrete and Cement Materials ResearchEnvironmental Impact and SustainabilityMaterials Engineering and Processing

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Life-Cycle Assessment of Alkali-Activated Materials Incorporating Industrial Byproducts

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Abstract

Eco-friendly and sustainable materials that are cost-effective, while having a reduced carbon footprint and energy consumption, are in great demand by the construction industry worldwide. Accordingly, alkali-activated materials (AAM) composed primarily of industrial byproducts have emerged as more desirable alternatives to ordinary Portland cement (OPC)-based concrete. Hence, this study investigates the cradle-to-gate life-cycle assessment (LCA) of ternary blended alkali-activated mortars made with industrial byproducts. Moreover, the embodied energy (EE), which represents an important parameter in cradle-to-gate life-cycle analysis, was investigated for 42 AAM mixtures. The boundary of the cradle-to-gate system was extended to include the mechanical and durability properties of AAMs on the basis of performance criteria. Using the experimental test database thus developed, an optimized artificial neural network (ANN) combined with the cuckoo optimization algorithm (COA) was developed to estimate the CO2 emissions and EE of AAMs. Considering the lack of systematic research on the cradle-to-gate LCA of AAMs in the literature, the results of this research provide new insights into the assessment of the environmental impact of AAM made with industrial byproducts. The final weight and bias values of the AAN model can be used to design AAM mixtures with targeted mechanical properties and CO2 emission considering desired amounts of industrial byproduct utilization in the mixture.

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Crossref · 10.3390/ma14092401

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Figures

Figure 1 Production stage of alkali-activated materials (AAMs).
Figure 1 Production stage of alkali-activated materials (AAMs).CC BY · PubMed Central
Figure 2 Cradle-to-gate and modified LCA boundary.
Figure 2 Cradle-to-gate and modified LCA boundary.CC BY · PubMed Central
Figure 3 Effects of exposure to sulfuric acid solution on CS and mass loss of AAM mortars.
Figure 3 Effects of exposure to sulfuric acid solution on CS and mass loss of AAM mortars.CC BY · PubMed Central
Figure 4 Effects of exposure to sulphate solution on CS and weight of AAM mortars.
Figure 4 Effects of exposure to sulphate solution on CS and weight of AAM mortars.CC BY · PubMed Central
Figure 5 Physical appearance of cubic AAM mortar specimens made with different industrial byproducts: (a) control sample, (b) after 365-days of immersion in sulfuric acid solution, and (c) after 365-days of immersion in sulphate solution.
Figure 5 Physical appearance of cubic AAM mortar specimens made with different industrial byproducts: (a) control sample, (b) after 365-days of immersion in sulfuric acid solution, and (c) after 365-days of immersion in sulphate solution.CC BY · PubMed Central
Figure 6 Relationship between ultrasonic pulse velocity (UPV) and CS for all 42 AAM mixtures: (a) original condition, (b) after immersion in sulfuric acid solution, and (c) after immersion in sulphate solution.
Figure 6 Relationship between ultrasonic pulse velocity (UPV) and CS for all 42 AAM mixtures: (a) original condition, (b) after immersion in sulfuric acid solution, and (c) after immersion in sulphate solution.CC BY · PubMed Central
Figure 7 Distribution of CO2 emission by AAMs ingredient and phase.
Figure 7 Distribution of CO2 emission by AAMs ingredient and phase.CC BY · PubMed Central
Figure 8 Distribution of EE by AAMs ingredient and phase.
Figure 8 Distribution of EE by AAMs ingredient and phase.CC BY · PubMed Central
Figure 9 Illustration of compressive strength versus normalized CO2 emissions.
Figure 9 Illustration of compressive strength versus normalized CO2 emissions.CC BY · PubMed Central
Figure 10 UPV versus normalized CO2 emission subjected to sulfuric acid attack.
Figure 10 UPV versus normalized CO2 emission subjected to sulfuric acid attack.CC BY · PubMed Central
Figure 11 UPV versus normalized CO2 emission subjected to sulphate attack. Add unit for UPV.
Figure 11 UPV versus normalized CO2 emission subjected to sulphate attack. Add unit for UPV.CC BY · PubMed Central
Figure 12 Scatter graph of the total density of input parameters using principal component analysis (PCA).
Figure 12 Scatter graph of the total density of input parameters using principal component analysis (PCA).CC BY · PubMed Central
Figure 13 Topology of a feed-forward artificial neural network (ANN) with two hidden layers (4–5–4–2 structure).
Figure 13 Topology of a feed-forward artificial neural network (ANN) with two hidden layers (4–5–4–2 structure).CC BY · PubMed Central
Figure 14 Probability plot diagrams for (a) CO2 emissions, and (b) EE.
Figure 14 Probability plot diagrams for (a) CO2 emissions, and (b) EE.CC BY · PubMed Central
Figure 15 Predicted vs. experimental values of EE estimated by the PCA-COA-ANN model.
Figure 15 Predicted vs. experimental values of EE estimated by the PCA-COA-ANN model.CC BY · PubMed Central
Figure 16 Predicted vs. experimental values of CO2 emissions estimated by the PCA-COA-ANN model.
Figure 16 Predicted vs. experimental values of CO2 emissions estimated by the PCA-COA-ANN model.CC BY · PubMed Central
Figure 17 Sensitivity indices of variable (a) CO2 emissions and (b) EE.
Figure 17 Sensitivity indices of variable (a) CO2 emissions and (b) EE.CC BY · PubMed Central

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Citations

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Metadata

Authors
Faridmehr, I., Nehdi, M. L., Nikoo, M., Huseien, G. F., & Ozbakkaloglu, T.
Affiliations
  • South Ural State University (RU)
  • Western University (CA)
  • Islamic Azad University, Ahvaz Branch (IR)
  • National University of Singapore (SG)
  • Texas State University (US)
Corresponding author
Nehdi, Moncef L.
Venue
Materials
Publisher
MDPI AG
Published
2021-05-05
Volume
14
Issue
9
Pages
2401
ISSN
1996-1944 (ISSN-L)
OpenAlex
W3157695626
Cited by
73
References
1
Citations by year
2026: 16 · 2025: 17 · 2024: 16 · 2023: 7 · 2022: 9 · 2021: 8
FWCI
5.17
Type
journal article
Language
en
Open access
Locations
  • Materials (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • National University of Singapore (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Physical Sciences › Engineering › Civil and Structural Engineering › Concrete and Cement Materials Research
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental Impact and Sustainability
  • Physical Sciences › Engineering › Building and Construction › Materials Engineering and Processing
Keywords
alkali-activated materials, industrial by-products, alkali-activated mortar, embodied energy, CO2 emissions, cradle-to-gate life cycle assessment, artificial neural networks, cuckoo optimization algorithm, mix proportion optimization, mechanical properties, durability properties, carbon footprint reduction

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