Evaluation of high-strength cementitious composite with iron ore tailing and gneiss waste as mineral admixture

Abstract

This study aimed to evaluate the physical-mechanical properties, electrical resistivity and microstructural characteristics of high-strength cementitious composites (HSCC) incorporating iron ore tailings (IOT) and quarry residue (gneiss powder - GN) at 28 and 180 days. The results showed that IOT and GN samples exhibited high compressive strength (> 90 MPa) and flexural strength (> 6 MPa). Little difference was identified regarding the hydrated phases. In the interfacial transition zone, the IOT and GN samples presented low pore content and reduced extension. It was concluded that high-strength cementitious composites with excellent physical and mechanical and durability performance could be developed using a mixture design based on particle packing and the incorporation of IOT and GN.