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The result would be more fly ash in landfill, more CO2 emissions and more resource use.”


With a long list of environmental and product performance benefits at stake, many are lamenting the possible risk that such a hazardous waste label would pose to its beneficial use.


“Even the guys who sell fly ash would tell you not to put this stuff on your pancakes,” quips King. “Like most of the substances in the natural world, fly ash is not for consumption or respiration. Does that mean we—or rather, the EPA—should formally declare it a hazardous substance, thus ending any chance of beneficial reuse or recycling?”


Meanwhile, the EPA doesn’t appear to be making a decision any time soon as the agency wades through the 450,000 comments made to the proposed rule.


Looking at the big picture, Kren considers himself an environmentalist and is actually a member of many of the organizations which opposed fly ash use. While he doesn’t doubt their motives, he also doesn’t believe they have science on their side, nor do they understand concrete and fly ash.


Reflecting back on fly ash’s introduction to concrete, Kren admits that the original idea was simply to make better concrete. “But now we feel that we are also doing some good since we know that every pound of fly ash we use reduces CO2 emissions by one pound, that we are conserving resources and that we are keeping fly ash out of landfill,” he explains. “It would be tragic if we sacrificed lowered emissions due to unfounded or unwarranted worries.”


 


CALSTAR ARCHITECTURAL FACE BRICK
With its new innovative process, CalStar’s brick products are not fired in a kiln and fully replace Portland cement with fly ash as a binder. The result is a high performing product with 40% recycled content, an 85% reduction in embodied energy, and an 85% decrease in carbon emissions. The brick is available in 10 shades, including 8 earthtone colors. http://calstarproducts.com


 


CERTAINTEED WEATHERBOARDS FIBER CEMENT SIDING
Authentically mimicking the look of wood, CertainTeed’s NAHB’s Green Approved WeatherBoards fiber cement siding combines fly ash with Portland cement to create a more durable, sustainable product. Available in more than 20 prefinished colors and stains, the siding features CertainTeed’s ColorMax Finishing System. www.certainteed.com


CALSTAR CLAY AND CONCRETE PAVERS
Made only with fly ash, and no Portland cement, CalStar’s Holland and Permeable Pavers meets ASTM C936, and come in eight earthtone colors and three range colors. With 40% recycled content, the Holland pavers measure 4 inches x 8 inches x 60mm, while the Permeable pavers are 5 inches x 10 inches x 80mm. www.calstar.org

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