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Title: Synthetic aggregate compositions derived from spent bed materials from fluidized bed combustion and fly ash

Cementitious compositions useful as lightweight aggregates are formed from a blend of spent bed material from fluidized bed combustion and fly ash. The proportions of the blend are chosen so that ensuing reactions eliminate undesirable constituents. The blend is then mixed with water and formed into a shaped article. The shaped article is preferably either a pellet or a "brick" shape that is later crushed. The shaped articles are cured at ambient temperature while saturated with water. It has been found that if used sufficiently, the resulting aggregate will exhibit minimal dimensional change over time. The aggregate can be certified by also forming standardized test shapes, e.g., cylinders while forming the shaped articles and measuring the properties of the test shapes using standardized techniques including X-ray diffraction.
Authors:
 [1]
  1. (Aston, PA)
Publication Date:
OSTI Identifier:
869516
Report Number(s):
US 5350549
DOE Contract Number:
FG02-90ER81006
Resource Type:
Patent
Research Org:
Valley Forge Labs., Inc., Devon, PA (United States)
Country of Publication:
United States
Language:
English
Subject:
synthetic; aggregate; compositions; derived; spent; bed; materials; fluidized; combustion; fly; ash; cementitious; useful; lightweight; aggregates; formed; blend; material; proportions; chosen; ensuing; reactions; eliminate; undesirable; constituents; mixed; water; shaped; article; preferably; pellet; brick; shape; crushed; articles; cured; ambient; temperature; saturated; found; sufficiently; resulting; exhibit; minimal; dimensional; change; time; certified; forming; standardized; shapes; cylinders; measuring; properties; techniques; including; x-ray; diffraction; bed material; shaped articles; x-ray diffraction; bed combustion; cementitious compositions; fly ash; fluidized bed; ambient temperature; shaped article; ensuing reaction; compositions useful; dimensional change; spent bed; exhibit minimal; aggregate composition; cementitious composition; /264/106/436/