Concrete is a time-tested construction standby, but the production of the key ingredient, cement, creates a massive amount of CO2 emissions.
Cement manufacturers in recent years have begun to offset cement's high electric and coal-fired consumption with other, bio-based sources. Plants are using from 5% to 20% alternative fuels, for example.
Some cement makers are innovating production to make it more sustainable. For instance, Calera has developed a process to collect 50% of the CO2 emissions from the cement-production process and use it to produce a new type of cement.
Some manufacturers have replaced some of the limestone in the cement mix with supplementary cementitious materials such as fly ash produced from burning coal and unheated limestone. Reducing the amount of heated limestone in the cement reduces the amount of energy needed in production.
Related Stories
Codes and Standards | Feb 21, 2022
More bad news on sea level rise for U.S. coastal areas
A new government report predicts sea levels in the U.S. of 10 to 12 inches higher by 2050, with some major cities on the East and Gulf coasts experiencing damaging floods even on sunny days.
Codes and Standards | Feb 21, 2022
New standard for ultraviolet germicidal irradiation
The Illuminating Engineering Society (IES) recently introduced the standard, ANSI/IES RP-44-21 Recommended Practice: Ultraviolet Germicidal Irradiation.
Wood | Feb 18, 2022
$2 million mass timber design competition: Building to Net-Zero Carbon (entries due March 30!)
To promote construction of tall mass timber buildings in the U.S., the Softwood Lumber Board (SLB) and USDA Forest Service (USDA) have joined forces on a competition to showcase mass timber’s application, commercial viability, and role as a natural climate solution.
Codes and Standards | Feb 18, 2022
Proposal would make all new buildings in Los Angeles carbon-neutral
Los Angeles may become the next large city to ban fossil fuels from new construction if legislation recently introduced in the city council becomes law.
Codes and Standards | Feb 18, 2022
U.S. Army outlines ambitious renewable energy and decarbonization goals
Net-zero emissions in all procurements and a microgrid at every base among aims.
Codes and Standards | Feb 17, 2022
Pandemic won’t alter urban planning
City planners focused on returning to ‘old normal’.
Codes and Standards | Feb 16, 2022
California court rules affordable housing developers exempt from local zoning
Case could set precedent on state law that overrides local rules.
Codes and Standards | Feb 15, 2022
FORTIFIED resiliency standard expanded to include multifamily sector
Voluntary, beyond-code program aims to protect buildings from severe weather.
Codes and Standards | Feb 10, 2022
Number of Americans at risk of flooding to double in 30 years
Most new risk from new development, not climate change.
Codes and Standards | Feb 10, 2022
Intl. Code Council committee on diversity seeks applicants
New board aims to increase diversity in the membership association.
