Evaluation of the Use of Power Plant Pond Ash in Highway Construction

摘要

The objective of the study is to evaluate power plant pond ash as a base course material. Pond ash consists of fly ash and bottom ash that have been codisposed of by sluicing to a disposal pond. The different base courses containing pond ash are: (1) 6-in. course of fine pond ash and 7 percent (by weight of pond ash) lime; (2) 6-in. course consisting of 5 parts coarse pond ash and 1 part sand clay plus 7 percent (by weight of pond ash) lime; (3) 6-in. course consisting of 5 parts coarse pond ash and 1 part sand clay plus 7.5 percent (by weight of pond ash) portland cement; (4) 8-in. course consisting of 50 percent each of pond ash and sand clay plus 2 percent (by weight of pond ash) lime; and (5) 8-in. course consisting of 50 percent each of pond ash and sand clay plus 6 percent (by weight of pond ash) lime. To date, all pond ash courses appear superior to the control section which is an 8 in. course consisting of sand clay mechanically stabilized with washed gravel. The pond ash sections and the control section will continue to be evaluated on an annual basis for three years.