Synthesis of alkali-activated binder at ambient temperature using copper slag as precursor

Abstract

The present study was conducted to synthesize the Alkali-Activated Binder (AAB) at ambient temperature using Copper Slag (CS) as precursor, which is industrial waste of copper smelting process. Optimum alkali dosage for the synthesis of AAB was selected based on the test results of compressive strength and microstructure. Characterization of AAB was done by Fourier-Transform Infrared Spectroscopy (FTIR), X-Ray Powder Diffraction (XRD), Mercury Intrusion Porosimetry (MIP) and Scanning Electron Microscope (SEM). Test results indicate that acceptable compressive strength can be achieved by using suitable alkali dosage and curing period. Refinement of pore structure and microstructure was also observed with an increase in alkali dosage. Aluminosilicate gel phase was detected in FTIR spectra of AAB. It was concluded that AAB can be synthesized at ambient temperature using CS as precursor and alkali dosage of 8% provides the maximum compressive strength up to 25 MPa.