Displaying items by tag: Bricks

Qatar: The Ministry of Environment and Climate Change has organised a symposium to launch a new ‘green’ cement made from sewage waste, with aims to support environmental sustainability and the circular economy in line with the Qatar National Vision 2030. The symposium highlighted the role of scientific research in transforming sewage into green cement. The cement is produced by treating sludge, resulting from solid sewage waste by burning, grinding and mixing it with catalysts, then is practically applied in the manufacture of building blocks and foam concrete. The amount of accumulated sewage waste is estimated at about 40,000t/yr, which can be used to produce 40 million bricks or 150,000m³/yr of foam concrete.

UK: A new study by the Mineral Products Association (MPA), supported by Innovate UK, has found that incorporating reclaimed clays and finely ground brick powder into cement production can reportedly lower the embodied CO₂ by up to 3%. The materials are used as calcined clay in the cement production process. The project aims to offer a viable alternative to fly ash and ground granulated blast-furnace slag, as resources diminish due to the steel industry's decarbonisation efforts.

MPA director Diana Casey said "Using discarded bricks and reclaimed clays will not only lower carbon and reduce the amount of materials sent to landfill but has the potential to create a whole new market if these clays become widely used in the construction industry, helping to retain economic value in the UK, secure jobs and attract investment."

China: Huaxin Cement and Hunan University have started a pilot production line that uses flue gas from a cement production line to manufacture concrete bricks. The process, being tested at the Huaxin Wuxue Industrial Park in Hubei Province, absorbs CO₂ from the flue gas and uses the heat of the gas to cure the bricks, according to the Xinhua News Agency. The average compressive strength of the bricks is above 15MPa. It is estimated that a production line with a brick output of 100m/yr could absorb 26,000t/yr of CO₂.

Malawi: LafargeHolcim and CDC Group, the UK's development finance institution, have signed a Memorandum of Understanding to set up a company to produce and promote an affordable low-carbon construction solution for developing countries.

The new company aims to scale up production of earth-cement bricks, a simple, reliable, affordable and environmentally-friendly building material that was launched by LafargeHolcim in Malawi in 2013.

Deforestation and forest degradation account for the majority of Malawi's greenhouse gas emissions. The manufacture of burnt bricks, the main building material in Malawi, is a significant contributor as a result of the wood-fired clamp kilns used in the production process.

LafargeHolcim has developed an alternative solution to burnt bricks. Durabric, designed by the Group's research and development centre, is produced from a mixture of earth and cement compressed in a mould and left naturally to cure in the sun without firing. Durabric contributes to a reduction in greenhouse gas emissions and the deforestation associated with wood fuel consumption. The bricks are also more resistant than fired bricks and reduce construction costs.

"Durabric offers many benefits compared to the traditional bricks used for construction in the developing world. It is easy to manufacture, has a smaller environmental footprint, offers more resistance, all at a lower cost," said Gérard Kuperfarb, Member of LafargeHolcim's Executive Committee in charge of Growth and Innovation. "Through the new company we are setting up with CDC, we will accelerate the development of this affordable, low-carbon solution in developing markets where traditional bricks are commonly used."

More than three million of these bricks have already been produced in Malawi and have been used in around 500 buildings. A brick production plant is being built to increase availability of Durabric in Malawi.