Rice engineers use byproduct from coal-fired power plants to replace Portland cement
The material is cementless and environmentally friendly, according to Rice materials scientist Rouzbeh Shahsavari, who developed it with graduate student Sung Hoon Hwang.
Fly ash binder does not require the high-temperature processing of Portland cement, yet tests showed it has the same compressive strength after seven days of curing. It also requires only a small fraction of the sodium-based activation chemicals used to harden Portland cement.
The results are reported in the Journal of the American Ceramic Society.
More than 20 billion tons of concrete are produced around the world every year in a manufacturing process that contributes 5 to 10 percent of carbon dioxide to global emissions, surpassed only by transportation and energy as the largest producers of the greenhouse gas.
Manufacturers often use a small amount of silicon- and aluminum-rich fly ash as a supplement to Portland cement in concrete. “The industry typically mixes 5 to 20 percent fly ash into cement to make it green, but a significant portion of the mix is still cement,” said Shahsavari, an assistant professor of civil and environmental engineering and of materials science and nanoengineering.
Previous attempts to entirely replace Portland cement with a fly ash compound required large amounts of expensive sodium-based activators that negate the environmental benefits, he said. “And in the end it was more expensive than cement,” he said.
The Latest on: Greener concrete
via Google News
The Latest on: Greener concrete
- Why Draymond Green believes 'the entire system is broken' for college athleteson June 25, 2020 at 11:06 am
Chris Murphy, a Democratic U.S. senator from Connecticut, told the world how much he enjoyed Draymond Green 's op-ed in The Washington Post labeling the NCAA "a dictatorship" and calling for increased ...
- 16 Ways The Pandemic Recovery Could Be Greenon June 25, 2020 at 5:55 am
As the world continues to confront the coronavirus pandemic and the deep economic fallout, environmentalists say this is a golden opportunity for a green recovery — using federal funds to avert the ...
- Essex Homes ‘Devonshire’ model is for sale in Spaulding Greenon June 25, 2020 at 5:18 am
BN] Homes featured Essex Homes of WNY’s new model at 5367 Glenview Drive in Clarence’s Spaulding Green community. For those ...
- The Supreme Court Has Given the Green Light to Bosses and Financial Managers to Steal From Workerson June 25, 2020 at 12:19 am
Robbing workers’ pension funds has long been central to Wall Street's business model. In last week's Supreme Court ruling, Brett Kavanaugh and his conservative cadre of justices opened the door for ...
- Phoenixville Businesses Prepare for Green Phase: What to Expecton June 24, 2020 at 1:19 pm
The green phase of coronavirus mitigation is finally here in Chester County, and Phoenixville's powerful local economy is starting to hum once again. On Friday, June 26, Chester County will move into ...
- TIFF Unveils Plans for 2020 Festival, Featuring CONCRETE COWBOY, Halle Berry's Directorial Debut & More!on June 24, 2020 at 7:20 am
TIFF announced today that the 45th edition of the Toronto International Film Festival, taking place September 10-19, is tailored to fit the moment, with physical screenings and drive-ins, digital ...
- Decorative Concrete Market Size, Share, Demand and Clinical Analysis 2020 to 20268on June 23, 2020 at 2:06 pm
Global Decorative Concrete Market to Grow due to Rising Shift towards Green Building The decorative concrete market is anticipated to grow, owing to the increase in acceptance of sustainable and green ...
- As construction tries to go green, builders and businesses are developing 'low carbon concrete'on June 22, 2020 at 8:41 am
Earlier this month Boral – an Australian firm that specializes in building and construction materials – announced the launch of a five-year partnership with the University of Technology Sydney (UTS).
- How green sand could capture billions of tons of carbon dioxideon June 22, 2020 at 7:14 am
Scientists are taking a harder look at using carbon-capturing rocks to counteract climate change, but lots of uncertainties remain.
via Bing News