ItemArticle

Strength Development of Geopolymer Composites Made from Red Mud-Fly Ash as a Subgrade Material in Road Construction

Title
Strength Development of Geopolymer Composites Made from Red Mud-Fly Ash as a Subgrade Material in Road Construction
Creator
Chandra K.S.; Krishnaiah S.; Reddy N.G.; Hossiney N.; Peng L.
Description
The application of industrial waste in construction reduces the dependency on natural resources. The materials, including red mud (RM) and fly ash (FA), proved to be favorable materials. However, the materials potential together as a geopolymer composite for road applications has rarely been explored. This study will examine the possibility of the replacement of natural materials in subgrade applications. To achieve this, the geopolymer compositions will be prepared by replacing RM with FA at replacement rates of 10%, 20%, and 30% by dry weight basis. The alkaline activator solution of 8 M will be prepared using sodium hydroxide (NaOH) and sodium silicate to develop geopolymer composites. The strength properties will be studied using the California Bearing Ratio (CBR) and unconfined compression strength (UCS) and validated with microstructural analysis using scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The results reveal that geopolymer composites could achieve a maximum CBR value of 12% and UCS of 2,700 kPa. The microstructural analysis revealed that the formation of dense calcium aluminate hydrate (C-A-H) and calcium silicate hydrate (C-S-H) are the reason for strength improvement. The leaching studies show that the toxic elements were within the permissible limits. Overall, the test results confirmed that the geopolymer composites meet the required strength and could be used as a subgrade material in road construction. 2020 American Society of Civil Engineers.
Source
Journal of Hazardous, Toxic, and Radioactive Waste, Vol-25, No. 1
Date
2021-01-01
Publisher
American Society of Civil Engineers (ASCE)
Subject
Fly ash; Geopolymer; Leaching; Red mud; Subgrade material; Waste management
Coverage
Chandra K.S., Dept. of Civil Engineering, JNTU Anantapuram, Anantapuram, Andhra Pradesh, 515002, India, Dept. of Civil Engineering, School of Engineering and Technology, Christ Univ., Bangalore, Karnataka, 560074, India; Krishnaiah S., Dept. of Civil Engineering, JNTU Anantapuram, Anantapuram, Andhra Pradesh, 515002, India; Reddy N.G., Dept. of Civil and Environmental Engineering, Shantou Univ., Shantou, Guangdong, 515063, China, Dept. of Civil Engineering, Kakatiya Institute of Technology and Science (KITS), Warangal, Telangana, 506015, India; Hossiney N., Dept. of Civil Engineering, School of Engineering and Technology, Christ Univ., Bangalore, Karnataka, 560074, India; Peng L., Dept. of Civil and Environmental Engineering, Shantou Univ., Shantou, Guangdong, 515063, China
Rights
Restricted Access
Relation
ISSN: 21535493
Format
Online
Language
English
Type
Article

Collection

Articles

Citation

Chandra K.S.; Krishnaiah S.; Reddy N.G.; Hossiney N.; Peng L., “Strength Development of Geopolymer Composites Made from Red Mud-Fly Ash as a Subgrade Material in Road Construction,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 28, 2025, https://archives.christuniversity.in/items/show/16093.

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