Life Cycle Assessment and Impact Correlation Analysis of Fly Ash Geopolymer Concrete

Geopolymer concrete (GPC) has drawn widespread attention as a universally accepted ideal green material to improve environmental conditions in recent years. The present study systematically quantifies and compares the environmental impact of fly ash GPC and ordinary Portland cement (OPC) concrete un...

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Bibliographic Details
Published in:Materials 2021-12, Vol.14 (23), p.7375
Main Authors: Shi, Xiaoshuang, Zhang, Cong, Liang, Yongchen, Luo, Jinqian, Wang, Xiaoqi, Feng, Ying, Li, Yanlin, Wang, Qingyuan, Abomohra, Abd El-Fatah
Format: Article
Language:English
Subjects:
Carbon
Carbon dioxide
Caustic soda
Cement
Climate change
Compressive strength
Concrete mixing
Construction industry
Correlation analysis
Curing
Design
Emission analysis
Emissions
Energy consumption
Environmental impact
Fly ash
Geopolymers
Greenhouse gases
Impact analysis
Impact factors
Inventory
Life cycle assessment
Multivariate analysis
Parameter sensitivity
Portland cements
Sodium
Sodium hydroxide
Sodium silicates
Variance analysis
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Summary:Geopolymer concrete (GPC) has drawn widespread attention as a universally accepted ideal green material to improve environmental conditions in recent years. The present study systematically quantifies and compares the environmental impact of fly ash GPC and ordinary Portland cement (OPC) concrete under different strength grades by conducting life cycle assessment (LCA). The alkali activator solution to fly ash ratio (S/F), sodium hydroxide concentration (CNaOH), and sodium silicate to sodium hydroxide ratio (SS/SH) were further used as three key parameters to consider their sensitivity to strength and CO2 emissions. The correlation and influence rules were analyzed by Multivariate Analysis of Variance (MANOVA) and Gray Relational Analysis (GRA). The results indicated that the CO2 emission of GPC can be reduced by 62.73%, and the correlation between CO2 emission and compressive strength is not significant for GPC. The degree of influence of the three factors on the compressive strength is CNaOH (66.5%) > SS/SH (20.7%) > S/F (9%) and on CO2 emissions is S/F (87.2%) > SS/SH (10.3%) > CNaOH (2.4%). Fly ash GPC effectively controls the environmental deterioration without compromising its compressive strength; in fact, it even in favor.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14237375