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Although the utilization of fly ash has increased over the last several decades, more than 60 percent of the fly ash produced each year in the United States continues to be disposed in ash ponds and landfills. Many disposal facilities are now or will soon be filled to their design capacity. As a result, there is an increasing interest in reclaiming existing fly ash pond areas. One possible use is...
Liquefaction resistance and post-liquefaction shear strength of impounded Class F fly ash are investigated using laboratory experiments. The study was aimed to evaluate liquefaction potential of a 45ha impoundment proposed as a base for a utility monofill. The evaluation included cyclic triaxial tests performed on reconstituted fly ash specimens with various densities at different confining stresses...
Fifty-nine coal combustion products were collected from coal-fired power plants using various dry flue gas desulfurization (FGD) processes to remove SO 2 . X-ray diffraction analyses revealed duct injection and spray dryer processes created products that primarily contained Ca(OH) 2 (portlandite) and CaSO 3 ·0.5H 2 O (hannebachite). Most samples from the lime injection...
A dry flue gas desulfurization (FGD) by-product was used to reconstruct the failed portion of a highway embankment. A wall was constructed through the failure plane to stop further slippage. To evaluate the suitability of FGD by-products in this type of project, the site of the repair was divided into three test sections. In the first section, the soil removed from the slide area was recompacted...
The effects of freeze-thaw cycling on the static compressive strength of samples of compacted, stabilized, wet flue desulfurization (FGD) by-products are reported. The results of laboratory tests show a clear relation between higher sample water contents and decreasing strength in the freeze-thaw cycling. In the samples tested, water contents 40 wt% were characteristic of all the freeze-thaw specimens...
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