PhD in Engineering
My name is Oruwalage Madura Hasaranga. I completed my Bachelor of Science (Honours) in Engineering at the University of Moratuwa, where I ranked third in my batch with a GPA of 3.98/4.2. I was awarded the Building and Structural Engineering Award and Special Award for Academic Excellence for outstanding academic performance. I have experience working as a contract lecturer at the University of Moratuwa and have also conducted lectures at Esoft College of Engineering and Technology as a visiting lecturer. Currently, I am pursuing a PhD in Engineering at Macquarie University, focusing on sustainable concrete solutions for mining industry.
Macquarie University
A/Prof. Sorn Vimonsatit
Evaluation of Low-Carbon Specialty Cement and SCMs for Cement Mine Backfill
The research project I am involved in focuses on the development of sustainable cementitious materials for mine backfilling applications. This project aims to explore innovative alternatives to Ordinary Portland Cement (OPC) by incorporating supplementary cementitious materials (SCMs), industrial by-products, and alternative binders such as geopolymers, calcium aluminate cement (CAC), and calcium sulfoaluminate cement (CSA).
My research specifically investigates the use of mine tailings, glass waste, plastic waste, and other industrial by-products as potential SCMs or aggregates in cemented paste backfill (CPB). By assessing the chemical composition, pozzolanic reactivity, and mechanical performance of these materials, the study aims to develop optimized mix designs that enhance strength, durability, and sustainability while reducing carbon emissions and costs associated with traditional OPC-based backfill. The project integrates experimental testing and microstructural analysis to evaluate the performance of sustainable backfill mixtures under harsh mining conditions. The outcomes will provide guidelines for mine operators to implement low-carbon, high-performance backfill materials, contributing to environmentally responsible mining practices.
My primary motivator for conducting this research was my keen interest in experiment-based research. I enjoy hands-on work and thrive at doing physical experiments, so this project is an excellent fit for my abilities and interests. The topic is extremely essential, as discovering sustainable solutions for mine backfilling is critical to the future of construction and environmental sustainability.
Furthermore, SmartCrete CRC plays an important role in advancing innovative research throughout Australia, with its findings being very relevant to both academics and industry. I consider myself extremely fortunate to be a member of this prestigious team, where I can contribute to research with real-world applications. Participating in an industry-led project also gives me a good exposure to industry, allowing me to build a strong professional network and earn significant knowledge for my future career.
One of the main highlights of this research is its real-world importance and the impact it can have on the mining industry. While there has been some research in this area, there is still a big knowledge gap, especially in developing sustainable cementitious materials for mine backfilling. This research helps to fill that gap by exploring alternative binders and SCMs, making backfilling more sustainable and cost-effective.
Another key highlight is the amazing support from the project team. My supervisor at Macquarie University has been very helpful and supportive, always guiding me in the right direction. Our project lead, Prof. Marjorie from the University of Sydney, has also been incredibly supportive, helping us solve challenges in our experiments. The UTS team and industry partners have been great as well, always there to answer questions and share their knowledge. Working with such a dedicated and collaborative team has been a great experience and has helped me move this research forward.
Right now, my main focus is to complete my PhD research successfully. After that, I’m open to both industry and research opportunities, whichever allows me to contribute meaningfully and apply my knowledge. I do have a slight preference for research, as I really enjoy the process of experimenting, problem-solving, and exploring new ideas. However, if a good industry opportunity comes along where I can make an impact, I would be more than happy to take it. My goal is to apply what I’ve learned in a way that benefits both science and practical applications.
My research contributes to Australia’s built environment and concrete ecosystem by developing sustainable alternatives to traditional cement-based mine backfills. The mining industry generates large amounts of waste, and conventional backfilling methods rely heavily on Ordinary Portland Cement (OPC), which is expensive and a major source of CO₂ emissions. By exploring alternative binders and supplementary cementitious materials (SCMs)—such as mine tailings, glass waste, and industrial by-products—this research helps reduce cement demand, lower carbon emissions, and promote circular economy practices.
The outcomes of this research can lead to more durable and cost-effective backfill solutions, reducing environmental impact while improving mine stability and long-term sustainability. Additionally, the knowledge gained from this study can be applied beyond mining, influencing the wider construction industry by encouraging the use of low-carbon materials in infrastructure projects across Australia.
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