Fluidized bed and pulverized coal combustion residues for secondary pavements

摘要

This paper presents the results of a laboratory investigation dealing with the properties of composites made with different proportions of pre-conditioned fluidized bed combustion (FBC) spent bed, pulverized coal combustion (PCC) fly ash, natural fine aggregate, and Portland cement. The study is intended to examine the extent to which the by-product composites can replace currently used materials in secondary roads. Test results show that compressive strength and linear expansion of PCC/FBC composites improved with increases in PCC fly ash content of the matrix. In addition, compressive strength increased and expansion decreased when testing conditions changed from soaked to sealed to air-dried. When a low dosage of Portland cement was added, significant increases in compressive strength and a decrease in one-year linear expansion were found.