SUSTAINABILITY
CONCRETE STEPS TOWARDS A
S
ustainable production of cement involves a multifaceted approach aimed at minimising environmental impact across the entire process. It
encompasses implementing energy-efficient technologies, optimising raw material extraction, minimising waste and reducing carbon dioxide emissions. Moreover, embracing alternative fuels such as biomass, waste-derived fuels or electricity throughout the production stages, not only reduces reliance on fossil fuels but also contributes to lower carbon emissions.
At Tarmac, Garry Gregory, packed products director, says the company is optimising manufacturing in order to make improvements where required. This includes introducing alternative fuels to remove the need for fossil fuels during the production stage. “In 2022, Tarmac introduced the UK’s first battery electric mixer truck as part of our commitment to net zero. As we procure 100% of electricity from clean energy sources – wind, solar and hydro power only – the new vehicle operates as a carbon neutral solution. By the end of 2024, Tarmac will be on track to operate the largest electric HGV fleet in the UK construction sector,” he says.
SUSTAINABLE FUTURE
The carbon debate is often focused on embodied CO2 measurements emitted during cement production, but the rest of the supply chain matters. too.
In addition to making the transition to zero tailpipe emissions, electrification can reduce noise and vibration, while contributing to improving air quality, particularly when operating in urban areas and low and zero emissions zones.
Process
Gregory explains that the concrete and cement sector currently accounts for 7% of global carbon emissions, predominantly from the chemical reaction that creates cement and the energy required to do so. “Applying automation, reducing physical administration and optimising digital solutions will substantially reduce the carbon footprint of product collections and deliveries in a way that is streamlined, robust and easy to use,” he says.
“For instance, our roll out of electronic payments removes manual intervention and taking paper out of the process and electronic proof of delivery is reducing the number of vehicle movements and time spent on site. In turn, this reduces the amount of carbon emissions during the processing stage.” By embracing sustainable processes, Gregory says that the cement industry can achieve a balance between economic growth and environmental stewardship, paving the way for a more resilient and environmentally conscious future.
“In the cement industry, sustainable products are often characterised by stringent environmental standards, and their capacity to minimise carbon emissions throughout their lifecycle. Such products typically adhere to certifications like BS8500, ensuring they meet specific criteria for reduced environmental impact,” he adds.
June 2024 A supplement to builders merchants journal
Sustainable cement products often incorporate alternative materials or additives that reduce the clinker content, a primary source of carbon emissions in cement production. Moreover, innovative formulations and manufacturing processes aim to enhance durability, longevity, and performance while minimising resource consumption and waste generation. By prioritising sustainability in product development, the cement industry strives to offer solutions that not only meet construction needs but also contribute to a more environmentally responsible built environment.
One key step is to move all ready-to-use Blue Circle products from CEM I to CEM II over the next 12 months. This will deliver up to a 15% reduction in CO2 emissions. However, it’s important to consider packaging and transportation as part of the sustainable journey.
Packaging
Gregory says: “There are very few materials more present in packaging than plastic. In fact, 34 per cent of the 90 million tonnes of construction waste generated each year is derived from materials used to package products and materials.
“However, the focus on sustainability extends beyond just reducing waste. A plastic packaging tax was introduced in April 2023 to incentivise businesses to use recycled plastic in packaging.
“At Tarmac we’ve recognised the need to go beyond, and are actively seeking ways to reduce our environmental footprint. We were the first cement manufacturer to produce 50% recycled bags, and we’re actively working towards developing a net-zero packaging solution within the next few years. By prioritising the use of recycled materials, we’re not only reducing our reliance on non- renewable resources but also minimising our contribution to the growing issue of plastic pollution.”
The placement and transportation of cement requires reinventing traditional delivery methods, reducing road deliveries, and expanding the use of alternative fuels. Tarmac’s Packed Products business, for example, has increased delivery load fill by c.10%, taking 1,400 deliveries off the road every year, by working closely with hauliers and customers, and through clever logistics planning.
Gregory continues: “Alongside this, the construction industry should be embracing positive change by taking advantage of opportunities, such as circularity of pallet use which promotes the reuse and recycling of pallets, in turn reducing waste and minimising environmental impact” n
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