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Construction Material Pyramid: [ Ссылка ]

Chapters
0:00 Introduction
1:16 Global warming
1:42 Ozone depletion
2:44 Photochemical ozone creation
3:11 Acidification
3:34 Eutrophication
4:28 Structural steel
5:09 Cross laminated timber
5:46 Sponsorship
6:33 Concrete
7:29 Conclusion

Can we rate structures based on the environmental impact of materials used to build them? That’s exactly what the Construction Material Pyramid hopes to achieve. The pyramid highlights the environmental impact of the most used construction materials like structural steel, aluminum, double and triple paned windows, insulation, lumber and more.

This interactive version of the material pyramid allows you to toggle between 5 impact categories. The first is the global warming potential or carbon footprint. GWP calculates how much heat is absorbed and trapped by a certain amount of gas, compared to carbon dioxide.

The second is the ozone depletion potential. During manufacturing, materials release certain gases that can degrade the ozone layer. When a single chlorine or bromine atom comes into contact with ozone in the stratosphere, it can destroy over 100,000 ozone molecules.

The third is photochemical ozone creation potential. Some materials produce carbon monoxide, nitrogen oxides and volatile organic compounds during manufacturing. When sunlights hits these compounds, they form ground level ozone which can affect our health.

The fourth is acidification potential. The extraction and production of some materials release sulfur dioxide, nitrogen monoxide and nitrogen dioxide into the air. They react with water, oxygen and other chemicals to form sulfuric and nitric acids, which can fall to the earth as acid rain.

Lastly, is eutrophication potential. An unnatural increase in nutrients like nitrogen and phosphorus in water starts a process called eutrophication. Algae feed on the nutrients, growing, spreading and turning the water green. In large concentrations, these compounds can lead to algal blooms, tainted water supplies and the death of fish.

The Construction Material Pyramid allows designers to quickly understand the impact of building materials. It reminds us that we should place value on the bones of buildings, not the stuff that we fill them with. Let’s talk about 3 materials that are featured in the construction pyramid.

Structural steel. Steel production is energy intensive and one of the leading sources of greenhouse gases. Nearly two tons of carbon dioxide are emitted for every 1 ton of steel produced. It also accounts for five percent of total greenhouse gas emissions.

Cross laminated timber. Engineered wood like glulams, cross laminated timber and laminated veneer lumber have the potential to revolutionize the building industry. To improve the properties of wood and make it even stronger than steel and concrete, layers of wood are sandwiched with moisture resistant glues and compressed under heat and pressure.

Concrete. The data on concrete really surprised me. Worldwide, we use about 30 billion tonnes of concrete a year, which accounts for 8% of global carbon dioxide emissions. When I was researching concrete for my video on geopolymers, every article and paper claimed that concrete was one of the most polluting materials, but it ranks lower than steel in every category!

I think that the takeaway from the construction pyramid is that materials like concrete, steel, and glass have allowed us to tame nature and push the limits of engineering but their extraction and production come at a cost. It’s important for us to be aware of that cost and, if possible, choose alternatives that are not as harmful to the environment.
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Disclaimer: This video was created for educational/informational purposes and qualifies as Fair Use. If you are the creator or own the footage featured in this video and have reservations please notify me via Youtube comments or email and I will accommodate you
#construction #materials #carbonfootprint #ecofriendly #architecture

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