Ebenezer Akin Oluwasola

Potentials of steel slag and copper mine tailings as construction materials

Abstract The present rate of utilisation of mine waste in a country like Malaysia is rather below expectation compared with some advanced countries. Many studies concentrate on a better way to increase the usage of industrial byproducts in order to ease disposal problems. Enormous quantities of steel slag and copper mine tailings are deposited in yards, polluting the environment. Researchers need to pay attention to the effective use of industrial byproducts in construction to address economic and environmental concerns. The potential uses of copper mine tailings and steel slag need to be explored and the negative impact of mine tailings should be reduced by exploring potential uses of these waste materials in the construction industry. Although copper tailings have negative effects on the environment owing to their acidic content, they also have some great economic value in terms of valuable metal contents. The engineering properties of steel slag and copper mine tailings were reviewed and their various areas of application are highlighted.

Effect of Aging on the Resilient Modulus of Stone Mastic Asphalt Incorporating Electric Arc Furnace Steel Slag and Copper Mine Tailings

Currently, the cost of production of stone mastic asphalt (SMA) is relatively high for paving roads and highways. One means of reducing the cost is to use relatively low cost by-products as aggregates and fillers. The main purpose of this study is to appraise the effect of aging on resilient modulus of SMA incorporating electric arc furnace (EAF) steel slag and copper mine tailing (CMT) as binary industrial waste materials. To achieve this aim, four mix designs consisting of EAF steel slag and CMT at various percentages were investigated. Marshall stability, drain down and indirect tensile resilient modulus tests were conducted. The indirect tensile resilient modulus test was carried out to assess the stiffness of SMA mixture at 25 and 40 °C. Stiffness variation in asphalt mixtures play a vital role in inflicting cracking and rutting in pavement. While some samples were unaged, equal numbers of samples were subjected to short term and long term oven aging. The results show that incorporating EAF steel slag and CMT into SMA mixture has a substantial positive effect on the drain down and resilient modulus of SMA. Thus, the study has contributed to the reuse of economical and environmentally friendly metallurgical and mining by-products in roads and highway industries.

Evaluation of Performance Characteristics of Stone Mastic Asphalt Incorporating Industrial Waste

AbstractAmong the numerous advantages of stone mastic asphalt (SMA) is its ability to provide durable surfacing, as well as its high resistance to rutting due to heavy axle loads. The level of research on the utilization of waste and by-products in the construction of SMA is still low, especially in developing countries. To address this gap, this study evaluated the performance characteristics of SMA incorporating electric arc furnace (EAF) steel slag and copper mine tailings (CMT). Mix 1 consisted of 100% granite; Mix 2 was 80% granite, 20% CMT; Mix 3 consisted of 80% EAF steel slag and 20% CMT; and Mix 4 was 40% EAF steel slag, 40% granite, and 20% CMT. The moisture susceptibility of the mixes was within the allowable limits and the mixture prepared with PG 76-22 is more susceptible to water damage. The resilient modulus of ethylene-vinyl acetate (EVA)–modified 80/100 mixes is also greater than PG 76-22 mixtures at both temperatures of 25°C and 40°C for the unaged and aged samples. The obtained results ...