{"id":40927,"date":"2018-04-30T15:12:30","date_gmt":"2018-04-30T14:12:30","guid":{"rendered":"https:\/\/www.pbctoday.co.uk\/news\/?p=40927"},"modified":"2018-04-30T15:15:28","modified_gmt":"2018-04-30T14:15:28","slug":"chemically-altered-soil-could-build-sustainable-homes","status":"publish","type":"post","link":"https:\/\/www.pbctoday.co.uk\/news\/planning-construction-news\/chemically-altered-soil-could-build-sustainable-homes\/40927\/","title":{"rendered":"Chemically altered soil could build sustainable homes"},"content":{"rendered":"

Scientists have revealed that adding chemicals to soil could create a strong and environmentally-friendly construction material to build homes in developing countries<\/h2>\n

The material, known as geopolymer-stabilised soil, is created when alkaline chemicals similar to those found in household cleaning products are added to the soil.<\/p>\n

Clay present in the soil is transformed into a geopolymer, a kind of glue similar to cement, which chemically binds the material today.<\/p>\n

Mud has been used as a construction material for hundreds of years but adding the chemicals makes it stronger, more durable and potentially more resistant to breaking down due to moisture.<\/p>\n

Scientists at the University of Bath<\/a> are examining whether geopolymer-stabilised soil could become a viable and robust construction material for building homes in some of the world\u2019s poorest areas.<\/p>\n

They say modern-day building materials, such as cement and bricks, can be environmentally damaging and unaffordable for people living in such countries.<\/p>\n

Geopolymers can typically be fired at 80C, whereas cement and fired bricks usually require more than 1,000C.<\/p>\n

Alastair Marsh, postgraduate researcher in civil engineering at the University of Bath, said: \u201cThe construction materials we have used so far in the 20th and 21st centuries have been very good, but they\u2019ve come at a high energy and carbon cost.<\/p>\n

\u201cWe\u2019re trying to find more environmentally friendly alternatives<\/a>. We\u2019re using a process called geopolymerisation to make sustainable bricks out of soil.<\/p>\n

\u201cIn this reaction, we produce a natural kind of cement that glues the soil together, making it stronger and more durable.<\/p>\n

\u201cThe advantage of this reaction is that it has a far lower energy cost. I\u2019m hoping that through this, we can make new construction materials that are practical, affordable and environmentally sustainable.\u201d<\/p>\n

Marsh added: \u201cThe familiar construction materials of fired brick and concrete have a heavy environmental cost, with cement production alone accounting for 5-10% of global greenhouse gas emissions.<\/p>\n

\u201cDeveloping lower impact construction materials is an essential task to enable our world\u2019s growing population to house ourselves adequately without contributing to climate change.\u201d<\/p>\n

Depending on the source materials and required properties, geopolymer-stabilised soils could have as little as half the carbon emissions impact of concrete, and a quarter that of fired bricks, he said.<\/p>\n

Marsh added that a typical family home could be built using approximately 10 tonnes of soil by adding 5-10% sodium hydroxide.<\/p>\n

There is a significant knowledge gap in understanding how the geopolymerisation reaction works for different soil types and Marsh is physically and chemically testing a range of soils to improve this.<\/p>\n

Professor Andrew Heath, of the University of Bath\u2019s Department of Architecture and Civil Engineering, concluded: \u201cThis research is key to the development of sustainable housing<\/a> around the world.\u201d<\/p>\n

The project has already led to a joint project looking at developing sustainable housing in India, in collaboration with the Indian Institute of Science<\/a> in Bengaluru.<\/p>\n

\n<\/div>","protected":false},"excerpt":{"rendered":"

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