WILDLIFE IN THE WAR ZONE by Amit Goswamy, wildlife biologist and former deputy commander of the Indian Armed Forces, Border Security Force. ...

Read more

Ecology: Are you in fashion? No longer a company without its environmental charter, no more a product without its eco-responsible promises, no more a speech coated with ecolo...

Read more

We know that recycling cans and taking shorter showers are not enough. On the occasion of Earth Day this April 22, PETA recalls that the last alarming IPCC report calls for a dr...

Read more

Not a fan of Unabomber. “When the hares declared equal rights between animals, they wanted to ostracize the lions; they didn't answer, but they bared their teeth &r...

Read more

Towards an essential decarbonisation of cement.

Cement. | Posted on 2021-05-31 11:16

The construction industry is accelerating its ecological transition.

The major players in the construction industry are planning to gradually decarbonise their businesses for decades to come. In France, for example, cement manufacturers announced new objectives after their meeting with the Minister for the Ecological Transition last week, Mrs. Barbara Pompili.

24% reduction in greenhouse gas emissions by 2030 and 81% by 2050. In an industry reputed to be very polluting, it was urgent to establish an ambitious roadmap committing the cement industry to decarbonizing the sector.

According to Mr François Pétry, CEO of LafargeHolcim, world leader in the sector, these levels can be achieved in three ways. First of all thanks to the capacity and efficiency of industrial tools; to know how to better and more use green energies. Then by replacing fossil fuels with energy recovery and the use of waste. Finally, it will be a question of developing more eco-responsible products by reducing the proportion of highly polluting ingredients in cements and binders.

While the short-term goals are relatively achievable, the longer-term ones are more difficult and will require heavy investment and support from public authorities.

It would be wrong to think that the construction sector is just beginning its ecological transition. The awareness to reduce the carbon footprint of this activity goes back several years. However, the urgency is there and we must go much faster, as Mr Pétry, CEO of the LafargeHolcim group recently recalled: " What is important to see is that our sector did not have up to now. now initiated in carbon reductions per tonne. But now it is on, and it will accelerate with extremely marked reductions. ”He added: “ In 2050, one tonne of cement produced should only generate 133 kilograms of CO2 against 660 kg in 2015, and 503 expected in 2030 ”.

For this, new techniques are being studied. The future now lies in carbon capture and valorization. The areas for improvement are carbon storage and the development of new, less costly approaches, for example by integrating the CO² from the manufacture of new products. Mr Petry also indicates that fossil energies such as coal will gradually give way to “energy-intensive waste (oils, tires, animal meal, paints, biomass such as end-of-life wood or demolition products): the current substitution rate of 40% will have to rise "to 80% in 2030 and 85% in 2050".

An interesting collaboration is a good illustration of the sector's desire for transformation. Total, Svante Inc (specialist in carbon capture), Oxy Low Carbon (subsidiary of Occidental Petroleum), and LafargeHolcim have come together to conduct a study which should lead to assess the feasibility of CO2 capture in a Holcim cement plant. Portland in Florence (Colorado, United States), whose purpose is to ensure the storage of CO2 in oil wells. Once captured, the carbon dyoxide is then stored in the earth's subsoil for a definitive period, thereby avoiding any release into the atmosphere. In addition to cement factories, this technique is applicable in a large number of industries that emit a large amount of CO², such as oil refineries, steel and petrochemical factories or even coal, fuel or gas-fired thermal power stations, chemical products factories among others.

Recycling is also a very interesting decarbonisation path that is easier to implement. This is the experiment that Eiffage is attempting by using concrete containing up to 100% recycled aggregates. For example, the company plans to recover 100% of the concrete resulting from the demolition of the École Centrale.

Construction is developing strongly and certain regions of the world are experiencing strong expansion. We obviously think of China. And even if alternatives exist and attract more and more; like wood, cement always has a bright future ahead of it. But it will have to quickly become greener and greener.

Posted on 2021-05-31 11:16

TODAY'S LIST OF THINGS TO DO TO AVERT THE APOCALYPSE AND OTHER NOTES TO SELF. What’s your problem? “Why should I care about a few bits of plastic ?&rd...

Read more

Michelle Thew is the CEO of Cruelty Free International – the leading organization working to end animal testing worldwide. For more than 20 years, Michelle has been an adv...

Read more

Live debate

Climate denial: can we still look elsewhere?

...

No messages currently, be the first!

                  What are the main drivers of deforestation and forest degradation and which role th...

Read more

DV8 Chat

Find your friends on DV8 Chat.

Suggestion

Newsletter

Receive news directly to your email!