We Energies Coal Combustion Products ... - The White House

affect combustion. The resulting fly ash from the reburning had an LOI of
between 0.2% and 0.5% based upon samples taken at intervals over four days.
Reburning of high carbon bituminous coal ash in sub-bituminous pulverized
fuel furnaces is now a regular procedure at We Energies Pleasant Prairie
Power Plant in Wisconsin and Presque Isle Power Plant in upper Michigan
with excellent results.
We Energies Bottom Ash as Fine Aggregate
in Concrete Masonry Products
Natural volcanic combustion products have been used in the manufacture of
masonry products since ancient times. Several decades ago cinders, a
combustion product of lump coal combustion, were used as a lightweight
aggregate in the manufacture of masonry blocks. However, not much
technical data was available on these products. Today, fly ash and bottom ash
have been extensively investigated to determine performance.
We Energies has investigated the suitability of its bottom ash and fly ash in
the manufacture of concrete bricks, blocks and paving stones. The following
data is from research conducted at the Center for By-Products Utilization
(CBU) of the University of Wisconsin-Milwaukee for We Energies at two
local manufacturing plants (52).
Concrete masonry products can be manufactured either by the wet-cast
process or the dry-cast process. Several mixes were designed at the CBU for
the manufacture of concrete bricks, blocks and paving stones using the drycast
method. Actual manufacture of the dry-cast test products was performed
at Best Block Company in Racine, Wisconsin, using standard manufacturing
equipment.
Tables 6-6 – 6-8 show the mixture design data for bricks, blocks and paving
stones using the dry-cast method. Tables 6-9 – 6-11 show the compressive
strength data for the above-mentioned products. The three mixtures for each
product have varying amounts of fly ash and bottom ash. Each of the three
products also has a control mixture with no fly ash and no bottom ash.
179 We Energies
Coal Combustion Products
Utilization Handbook