Sources: U.S. Environmental Protection Agency; American Coal Ash Association, Farmington Hills, Mich.; CP staff
Five years after proposing potentially onerous regulations for coal combustion residuals (CCR) management and disposal—triggering an uproar across the concrete industry regarding ASTM C618-grade fly ash marketability—EPA has released an evaluation of recycled CCR almost certain to put lingering concerns to rest.
Sources: Ceratech Inc., Alexandria, Va.; CP staff
By Don Marsh
A company known for packaged dry or pre-mixed concrete repair or mortar geared to specialty applications has announced a ‘carbon neutral system’ of liquid or powder agents imparting Types I–V portland cement performance characteristics in 100 percent fly ash binder mix designs.
With a green light-basked polar bear as trademark, Ceratech unveiled Ekkomaxx at the 2011 Precast Show (January 27–29, Charlotte, N.C.), noting initial testing efforts in manufactured concrete, where producers have greater control over specifications than their counterparts in ready mixed. The company is promoting the technology’s potential for rapid deployment at existing plants, with Class C fly ash charged from dedicated silo compartments and five Ekkomaxx admixtures dispensed from conventional ground or floor tanks.
Sources: Environmental Integrity Project, Washington, D.C.; Earthjustice, San Francisco
By Don Marsh
Proponents of an onerous, Environmental Protection Agency-proposed rule governing disposal of utilities’ coal combustion residuals (CCR) are challenging agency officials’ $23 billion estimate of the value of concrete-grade fly ash and other marketable-CCR recycling.
Coal market leader Peabody Energy reports a $15 million equity interest in Calera Corp., whose research into carbon dioxide capture from power stations, cement plants and other industrial sources is leading to a process for synthetic aggregate and supplementary cementitious materials