Jordan Journal of Civil Engineering

Impact of Waste Iron Slag on Mechanical and Durability Properties of Concrete


Kishan Lal Jain; Dinesh Kumar Sharma; Rakesh Choudhary; Shruti Bhargava;


Waste management is of great concern in today’s world. Every year, an enormous amount of solid waste is generated from different industrial activities. Especially, the waste which produces by iron industries in a particular form of slag. The major issue of emission of carbon-di-oxide from cement industries is a serious problem for the earth's environment and surrounding area. Thus, in this study, the waste iron slag obtained from nearby iron industries was used as a partial substitute for cement. The cement was replaced with iron slag (IS) at the substitution levels of 7.5%, 15%, 22.5%, 30%, and 37.5% by weight of cement. The doses of superplasticizer for every mix were taken based on the essential workability requirements for the reinforced concrete work. Performance of control and blended mixes were evaluated by workability evaluation, compressive strength test, flexural strength test, water permeability test, water absorption evaluation, rapid chloride penetration test (RCPT) and carbonation test. Scanning electron microscope (SEM), X-ray diffraction (XRD) techniques, and Thermogravimetric analysis (TGA) techniques were used to assess the microstructural changes and to evaluate the chemistry of blended mixes. The results obtained from this study were encouraging in terms of compressive and flexural strength. The maximum compressive and flexural strength was recorded at a 22.5% replacement level of slag. Although the results obtained at 30% replacement were also better than the control mix. Resistance of slag made concrete against adverse condition i.e. CO2 penetration, chloride penetration, and water penetration was far better than conventional ones. The results obtained from TGA indicated that the productivity of calcium silicate gel of slag concrete is better than control concrete.


Concrete, Slag, Carbonization, RCPT, XRD, TGA