In this news, we discuss the Cement-free concrete beats corrosion and eliminates fatbergs.
Researchers have developed an environmentally friendly cementless concrete, which eliminates corrosion and prevents fatbergs.
Corrosion of concrete and fatbergs affect sewer systems around the world, leading to costly and disruptive maintenance.
But now engineers at RMIT University have developed a concrete that can withstand the corrosive acidic environment of sewer lines, while dramatically reducing the residual lime that leaches out, contributing to fatbergs.
Fatbergs are coarse globes of frozen mass clogging the sewers with grease, grease, oil, and non-biodegradable waste like wet wipes and diapers, some up to 200 feet long and weighing tons.
These buildups of grease, oil and grease in sewers and pipelines, along with general corrosion over time, cost billions in pipe repairs and replacements.
RMIT researchers, led by Dr Rajeev Roychand, have created concrete that removes free lime – a chemical compound that promotes corrosion and fatbergs.
Roychand said the solution is more durable than regular Portland cement, making it perfect for use in large infrastructure, such as wastewater drainage pipes.
“The world’s concrete sewer pipes have suffered from durability issues for too long,” Roychand said.
“Until now, there has been a great lack of research in the development of environmentally friendly materials to protect sewers from corrosion and fatbergs.
“But we have created a protective, solid and ecological concrete, the perfect trio.
Manufacturing industry by-products are key ingredients in cementless concrete – a cementless composite made of nano-silica, fly ash, slag and hydrated lime.
Not only does their concrete use high volumes of industrial by-products, supporting a circular economy, it exceeds the strength standards for sewer lines set by ASTM International.
“Although regular Portland cement is widely used in the fast-paced construction industry, it poses long-term durability issues in some of its applications,” Roychand said.
“We have found that making concrete from this composite mixture – rather than cement – dramatically improves longevity.”
Replacing underground concrete pipes is a tedious task, tearing up the soil is costly and often has a ripple effect on prolonged traffic delays and neighborhood nuisances.
The Water Services Association of Australia estimates that maintaining sewage systems costs $ 15 million a year, billions worldwide.
The environmental cost is higher – regular Portland cement accounts for about 5% of global greenhouse gas emissions.
However, the RMIT study has proven that some byproducts can be up to par, replacing cement and able to withstand the high acidity of sewer lines.
“Our cementless concrete has multiple advantages: it is environmentally friendly, reduces concrete corrosion by 96% and completely eliminates residual lime which contributes to the formation of fatbergs,” said Roychand.
“With further development, our cementless concrete could be made completely resistant to acid corrosion.”
Cementless concrete beats corrosion and eliminates fatbergs
Corrosion of concrete and fatbergs affect sewage systems