Research on potential uses of solid wastes from fluidized-bed combustion processes included the following activities during this quarterly report period: chemical analysis was performed on a pulverized coal fly ash that was proposed for use in the briquetting program; briquettes were evaluated by abrasion testing, incorporation into concrete mixes as the coarse aggregate, and by an examination of their crushing characteristics; the effects of carbonation of briquettes by exposure to CO/sub 2/ were studied; final data on the dimensional stability of test pads are presented; the wall constructed with AFB masonry block was monitored and additional compressive strengths of the block determined; waste sludge stabilization using AFB residue was tested and the results are reported; evaluation of crushed, stockpiled residue has continued; the qualitative review of the effects of molding moisture content on road base mixes has been completed; and preliminary results on the effects of combined storage of AFB residue and pulverized coal fly ash were obtained and are presented. (LCL)