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50 STRUCTURAL ELEMENTS


when specified correctly, for example. Operational emissions from heating and cooling a building can also be notably reduced due to the materials’ thermal mass qualities, and without compromising on comfort. This is merely one example of how


concrete blocks can aid the transition towards a greener, environmentally friendly built environment. There are however more direct actions being taken within the building products sector in order to ensure best practice and a better future.


THE FACT OF THE MATTER In the past decade, the industry has made considerable headway in significantly lowering emissions resulting from the production of concrete blocks. We’ve achieved a reduction of 13 per cent carbon intensity since 2008 for example, facilitated by improvements to the manufacturing process itself. The impact of emissions through the


transportation of goods is equally low in relation to other building products, due to the fact blocks rarely need to travel far. A wide variety of concrete blocks are produced in the UK, made in local production facilities from constituents delivered locally, thus minimising their environmental footprint. There’s no denying that cement


accounts for much of a concrete block’s


CEMENT CAN NOW BE BLENDED WITH LOWER IMPACT MATERIALS TO REDUCE EMBODIED C02


WWW.HBDONLINE.CO.UK


impact. While it remains an indispensable part of the composition, it can now be blended with lower impact cementitious materials to reduce the overall embodied


CO2. In the UK, this is now standard practice, with two of the most commonly used substances, fly ash and ground granulated blast furnace slag (GGBS), being industry by-products finding a new purpose.


CRITICAL MASS Adapting to the inconvenient truth of climate change, we need to double our efforts to ensure the homes we build are comfortable and energy efficient. The core materials used are vastly influential in this regard. Providing inertia against temperature fluctuations is key, as it will help homeowners by potentially reducing energy bills through improved energy efficiency. One of the most important ways the whole-life performance of a building can be improved is through taking advantage of a concrete block’s thermal mass. The material absorbs and stores heat during the day, which is then removed overnight, passively through ventilation. This gives the structure a natural, alternative method to control temperature. When heat is released gradually, the need to resort to air conditioning or central heating is minimised. This also reduces the overheating risk.


SECOND NATURE Of course, fundamental to the concept of the circular economy is casting our eyes beyond end of life and finding ways to reuse and recycle products. After their initial lifespan, concrete blocks can find a second life in groundworks, piling mats and landscaping. Crushed, they can be


used as recycled aggregate. In fact, CBA members have publicly committed to only manufacturing blocks that are fully recyclable. Further CO2 is released in deconstruc-


tion and waste processing at the end of a building’s life, therefore improving how building products are manufactured and specified is everyone’s responsibility. It is vitally important that producers


introduce measures to reduce energy consumption, focusing on the elimination of waste and the adoption of environmental and sustainable management systems that go further than what is legally required.


LEAN & FLEXIBLE DESIGN The wider housebuilding and architec- tural industries need to also be fully invested in order for the circular economy concept to be effective. Everybody needs to be on board with the message of material efficiency and lean design, whereby we use less resources and use them in a smarter way. Luckily, our technologies have been


swiftly improving, and innovation is helping us to achieve this. Calculating the optimal build-up of structures needed for best energy efficiency is now possible. For a building to be able to assume new


uses, incorporating new technologies and the changing climate, flexibility must be built in from the outset. We have not yet arrived at a point where construction and manufacturing are truly ‘circular,’ but we have taken leaps towards it. Maintaining the momentum is key, even through these economically uncertain times.


Chris Stanley is housing manager at the Concrete Block Association


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