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 | Jan 22, 2020
Potential energy savings from smart meters is largely unrealized
Most utilities underuse the technology that can help customers save money.
Codes and Standards | Jan 21, 2020
Contractors pay practices reviewed in new database
Fastest and slowest paying GCs revealed.
Codes and Standards | Jan 17, 2020
Several states with ambitious climate goals will have to restrict natural gas as a fuel
Buildings would have to heat and cook with electricity.
Codes and Standards | Jan 16, 2020
New solar-ready mandate affects commercial and residential buildings in St. Louis
All new buildings must have reserved rooftop sections for PVs.
Codes and Standards | Jan 15, 2020
Trump Administration blocks new light bulb efficiency standards
Move defies bipartisan 2007 law.
Codes and Standards | Jan 14, 2020
L.A.’s expedited permitting process credited with faster approvals on $1 billion project
Parallel Design-Permitting Process includes flagging elements for correction during conceptual design.
Codes and Standards | Jan 13, 2020
Kansas City is first in nation to offer free public transportation
Aim is to increase mobility to spur more economic activity.
Codes and Standards | Jan 9, 2020
Dept. of Defense will require beefed up cybersecurity standards in January
All contractors will have to demonstrate secure practices.
Codes and Standards | Jan 8, 2020
2019 Oregon Zero Energy Ready commercial code will boost efficiency by 14%
ASHRAE 90.1 is the basis for new code that went into effect Oct. 1.
Codes and Standards | Jan 8, 2020
Energy efficiency initiatives have significantly cut energy consumption per square foot
Lighting and space heating fell by more than 600 trillion Btu from 2003 to 2012.