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

Nagarajan Arunachelam, Jeyaprakash Maheswaran (), Maheswaran Chellapandian and Togay Ozbakkaloglu
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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

Sustainability, 2022, vol. 14, issue 23, 1-25

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.

Keywords: alkaline activators; copper slag; geopolymer concrete; low-calcium fly ash; microstructure analysis; NaOH molarity (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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