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Re: Fly Ash

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One excellent reason to use at least a small percentage of flyash (or GGBFS) substitution (say 15%) in virtually all concrete mixes is the environmental benefit provided. The manufacture of portland cement consumes enormous amounts of energy and generates lots of CO2, a greenhouse gas (one ton of CO2 is produced for every ton of cement manufactured). Thus eliminating portland cement from the mix and replacing it with flyash or GGBFS, both of which are industrial waste products, saves energy and reduces greenhouse gas production.

Many ready-mix companies are already slipping flyash into their mixes because it is cheaper than cement. In addition to the environmental benefits, flyash improves many other properties of the concrete, as others have pointed out.

Research into high-volume flyash (HVFA) concrete, with greater than 50% flyash substitution, is ongoing.

<br><br><br>Mark D. Webster
Simpson Gumpertz & Heger
297 Broadway
Arlington, MA  02474

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