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Effective Utilization of Copper Slag for the Production of Geopolymer Concrete with Different NaOH Molarity under Ambient Curing Conditions

Author

Listed:
  • Nagarajan Arunachelam

    (Department of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi 626005, India)

  • Jeyaprakash Maheswaran

    (Department of Civil Engineering, St Xavier’s Catholic College of Engineering, Nagercoil 629003, India)

  • Maheswaran Chellapandian

    (Department of Civil Engineering, Mepco Schlenk Engineering College, Sivakasi 626005, India)

  • Togay Ozbakkaloglu

    (Department of Civil Engineering, Texas State University, San Marcos, TX 78666, USA)

Abstract

In spite of the considerable research on the mechanical and durability properties of geopolymer concrete, its widespread applicability is hindered due to the difficulties involved in achieving ambient curing conditions and awareness of the effective utilization of industrial by-products. This study investigates the physical and microstructure characterization of sustainable geopolymer concrete (GPC) developed with copper slag as a replacement for fine aggregate. In total, forty-four geopolymer concrete mixtures were prepared to examine their fresh and hardened properties. Four different NaOH molarities (10, 12, 14 and 16) and the replacement levels of copper slag, ranging from 0 to 100% with an increase of 10%, were considered as variables in this research. The study parameters examined includes the fresh (slump) and hardened concrete properties. Additionally, the microstructural characterization for different mixes were studied using the Fourier Transform Infrared Spectroscopy (FTIR), Electron Dispersive Spectrum (EDS) analyses and Scanning Electron Microscope (SEM). Results indicated that replacing fine aggregate with copper slag up to 100% showed no strength reduction. Increasing the molarity of the NaOH solution to 16M led to an increased strength of about 35% compared to the concrete with 10 M in all the mixes. The microstructural analysis performed using SEM/EDS and FTIR showed that a cohesive and fully compact geopolymer matrix was achieved together with the use of low-calcium fly ash and copper slag under ambient curing conditions.

Suggested Citation

  • Nagarajan Arunachelam & Jeyaprakash Maheswaran & Maheswaran Chellapandian & Togay Ozbakkaloglu, 2022. "Effective Utilization of Copper Slag for the Production of Geopolymer Concrete with Different NaOH Molarity under Ambient Curing Conditions," Sustainability, MDPI, vol. 14(23), pages 1-25, December.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:23:p:16300-:d:995331
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    Cited by:

    1. Ebrahim Sharifi Teshnizi & Jafar Karimiazar & Jair Arrieta Baldovino, 2023. "Effect of Acid and Thermo-Mechanical Attacks on Compressive Strength of Geopolymer Mortar with Different Eco-Friendly Materials," Sustainability, MDPI, vol. 15(19), pages 1-22, September.

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