Title: Development of High-Strength Nano-Cementitious Composites Using Copper Slag
Author(s): S. Lavanya Prabha, M. Gopalakrishnan, and M. Neelamegam
Publication: Materials Journal
Appears on pages(s): 37-46
Keywords: chloride ion permeability test; copper slag; high-strength cementitious composites; nano-cementitious composites
This investigation was carried out to develop high-strength cementitious composite mixtures of compressive strength greater than 90 MPa (13.05 ksi). The main aim of this study is to develop high-strength cementitious composites having high density with low void content. To achieve the requirement, cement, copper slag, quartz powder, and silica fume ingredient proportions were arrived by optimum partial packing as well as the Dewar and Larrard method. More than 60 cementitious composite mixtures with and without high-strength micro-steel fiber and chopped basalt fiber were prepared and their compressive strength at the age of 28 days cured under normal water curing was investigated. In all the investigated trial mixtures, 100% copper slag was used instead of normal river sand and a required quantity of high-range water-reducing admixture (HRWRA) was used to maintain workability. Based on the 28-day compressive strength (greater than 90 MPa [13.05 ksi]), four cementitious composite mixtures were selected as optimized mixtures and their mechanical and durability properties were evaluated as per Indian Standard IS 516 and ASTM C469, and their rapid chloride permeability was assessed by ASTM C1202. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis were also carried out on four optimized composite mixtures. This project aims to develop mixtures suitable for the construction of storage buildings for arms and ammunition of defense research and development organizations (DRDO), and also these composites can be used in many special applications where high mechanical and durability properties are required.