Effect of recycled fine powder as a calcium source on fresh and hardened properties of geopolymer mortar

A.  Sharma; P. Singh; K. Kapoor

doi:10.3989/mc.2024.359923

Authors

A. Sharma Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology https://orcid.org/0000-0003-3273-3703
P. Singh Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology https://orcid.org/0000-0002-4703-2646
K. Kapoor Department of Civil Engineering, Dr B R Ambedkar National Institute of Technology https://orcid.org/0000-0002-8284-165X

DOI:

https://doi.org/10.3989/mc.2024.359923

Keywords:

Fly ash, Recycled fine powder, Geopolymer mortar, Compressive strength, Water absorption, Dry shrinkage, Acid attack

Abstract

This study explores the efficacy of Recycled Fine Powder (RFP) derived from construction and demolition waste as a sustainable substitute for Ordinary Portland Cement (OPC) as a Calcium (Ca) source in geopolymer mortar. Fresh properties of Geopolymer Mortar (GPM) were evaluated in terms of slump-flow, initial-final setting time, whereas hardened properties were evaluated in terms of Compressive Strength (CS), Water Absorption (WA), porosity, acid attack, and dry shrinkage at both ambient and heat curing. Results indicate that the RFP performs well in all mixes. However, mix C10R10 shows the overall best results, as 17% higher compressive strength was observed as compared to mix C20R0, which further increases to 88% when compared to mix C0R0. Thus, RFP provides sufficient Ca content as an activator in GPM.

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