How veges could help create greener buildings

It’s well known that vegetables are good for people, but they could also be the key to making stronger, greener buildings, according to engineers at Lancaster University in England. They’re working alongside industrial partners at CelluComp Ltd UK to research how concrete mixtures can be strengthened and made more environmentally friendly by adding nano platelets extracted from the fibres of root vegetables.

The work builds on findings from early tests that have demonstrated that concrete mixtures including nano platelets from sugar beet or carrot significantly improve the mechanical properties of concrete.

These vegetable-composite concretes were also found to out-perform all commercially available cement additives, such as graphene and carbon nanotubes, and at a much lower cost.

Lancaster University is working on vegetable composite concrete products.

The root vegetable nano platelets work both to increase the amount of calcium silicate hydrate – the main substance that controls the performance of concrete, and stop any cracks that appear in the concrete. By increasing the performance of concrete, smaller quantities are needed in construction.

The construction industry is urgently seeking ways in which to curb its carbon emissions. The production of ordinary Portland cement, one of the main ingredients for concrete, is very carbon intensive – its production accounts for eight per cent of total global CO2 emissions. This is forecast to double in the next 30 years due to rising demand.

The proof-of-concept studies showed that adding the root vegetable nano platelets resulted in a saving of 40kg of ordinary Portland cement per cubic metre of concrete – which gives a saving of 40kg of CO2 for the same volume. This is because the greater strength of the root vegetable mixture means smaller sections of concrete are required in buildings.

Lead researcher, Professor Mohamed Saafi from Lancaster University’s Engineering Department, believes root vegetable concrete could go a long way to reducing construction carbon emissions. “These novel cement nanocomposites are made by combining ordinary Portland cement with nano platelets extracted from waste root vegetables taken from the food industry,” Professor Saafi says. “The composites are not only superior to current cement products in terms of mechanical and microstructure properties, but also use smaller amounts of cement. This significantly reduces both the energy consumption and CO2 emissions associated with cement manufacturing.”

Could vegetable fibre lengthen the lifespan of traditional concrete materials?

The vegetable-based cementitious composites were also found to have a denser microstructure, which is important to prevent corrosion and increasing the lifespan of the materials, he said.

The research project is also looking at adding very thin sheets made from vegetable nano platelets to existing concrete structures to reinforce their strength. The researchers believe that the vegetable nanofibre-based sheets will outperform existing alternatives, such as carbon fibre. This is partly because concrete beams reinforced with the sheets will be able to bend more, which would help deflect potentially damaging forces.

The two-year research project will investigate the science behind the results of the proof-of-concept studies to gain a fuller understanding of how the vegetable nano platelet fibres enhance the concrete mix. The researchers will also seek to optimise the concrete performance to help produce a mixture that can be used in the construction industry.

CelluComp Ltd already uses fibres from root vegetables to manufacture more durable paints.