Dr. Safiuddin specializes in construction materials. He has developed several new construction materials, such as high-performance concrete with quarry dust, carbon fiber-reinforced cement composite, self-consolidating concrete with agricultural waste (e.g., palm oil fuel ash, rice husk ash), and self-consolidating concrete with recycled concrete aggregate. In recent years, Dr. Safiuddin has been involved in developing advanced construction materials, such as fiber-reinforced self-consolidating concrete and nanomaterial-incorporated concrete. His current research interests include innovative and sustainable construction materials, such as ultra-high-strength concrete and carbon nanofiber-reinforced cement composite.