Sirri Neba Nforsoh, an environmental engineering researcher at University of Rhode Island, often begins her workday far from the laboratory. Before any equipment is powered on, she walks through collection sites where plastic bags, beverage bottles, and abandoned fishing nets accumulate in large quantities. What many consider waste; she regards as raw material. “When you stand next to it, you realise how much of it we produce every day,” she says. “The question became: what if this didn’t have to go to a landfill at all?”
Back in the laboratory, the transformation begins. The plastics are washed and shredded into small fragments and mixed with aggregates (like sand). The mixture is heated in an extrusion system until it melts into a thick, workable mass, then pressed into molds and cooled. The resulting construction blocks appear simple, yet they represent a deliberate rethinking of how waste can be repurposed.
The idea emerged from a clear observation: communities burdened by plastic pollution often lack ways to manage the waste and affordable building materials. The blocks produced through this process can be used for walkways, outdoor flooring, and small housing structures. They are lighter than concrete and resist water absorption, making them particularly useful in regions with heavy rainfall or poor drainage.
To further enhance the material, Sirri incorporated another overlooked waste stream discarded seashells from coastal areas. After cleaning and grinding the shells into fine particles, she blends them with molten plastic. The shells act as a natural mineral filler, increasing stiffness and reducing the need for sand. A stabilizer is also added to protect the blocks from ultraviolet radiation, slowing the polymer degradation that occurs with prolonged sunlight exposure.
Inside the laboratory, the blocks undergo rigorous testing. Mechanical equipment applies pressure to measure compressive strength and load‑bearing capacity, while weathering experiments expose samples to moisture and sunlight to simulate long-term outdoor use. Results show that the blocks can withstand pedestrian traffic and light structural demands.
Environmental safety remains a priority. To address concerns about recycled materials, Sirri conducted leaching experiments for extended periods and analyzing whether any substances migrated from the blocks into water. “We needed to be certain the blocks would not harm soil or water during rain exposure,” she explains. “Safety had to be proven, not assumed.”
Sirri also evaluates the manufacturing environment. Heating plastics can release microscopic airborne particles, prompting air‑quality assessments around the extrusion equipment. These measurements inform ventilation and filtration recommendations to protect workers, underscoring that sustainability must also encompass occupational health.
For Sirri, the most rewarding moment occurred outside the laboratory, watching the finished blocks being installed along a walkway. Materials that once littered coastlines and streets had become a stable path beneath people’s feet. The transformation was immediate and visible: pollution turned into infrastructure.
Sirri’s work presents a practical model for circular waste management. By redirecting plastic waste into long-lasting construction materials, the project reduces landfill accumulation and decreases reliance on cement‑based products. Through the integration of engineering, environmental testing, and community needs, the research demonstrates that sustainable development can begin not with new resources, but with reimagining the ones already available.
Sirri Akongnwi Neba Nforsoh
Researcher at University of Rhode Island
Email: snebanforsoh@gmail.com
