Fly ash stabilised red mud as a one-part alkali-activated sustainable material for pavement subgrade: strength, durability and life cycle assessment analysis
Source abstract
Abstract
In this study, the viability of using red mud (RM) as an alkali source and fly ash (FA) as an aluminosilicate source for making all waste-based one-part alkali-activated material without commercial activators for pavement subgrade has been evaluated. The study reveals that the UCS and CBR increase with the increase in FA percentage up to 40% and then decrease. UCS of RM increases from 0.31 MPa to 1.17, 1.56, 2.12, and 1.71 MPa for 20%, 30%, 40%, and 50%, respectively. One-part alkali-activated RM-FA with 30% FA was identified as the optimum mixture. Microlevel investigation reveals the formation of N-A-S-H and C-S-H. The resilient modulus (Mr) was found to be 80 MPa for 30% FA sample cured for 28 days. The heavy metal concentration in one-part alkali-activated RM-FA samples is within the acceptable limit. The environmental impact assessment shows the one-part alkali-activated RM-FA to be an environmentally friendly pavement subgrade material.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Bauxite Residue and Utilization · Concrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Indian Institute of Technology (ISM)
Funding
Department of Science and Technology (DST), India, under the Science and Engineering Research Board (SERB) program
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