BOTTOM ASH AND BOILER SLAG

This paper presents the results of laboratory studies conducted at West Virginia University to determine the physical, chemical, and engineering properties of bottom ash and boiler slag. The identification tests consisted of a determination of (1) the shape and surface texture of the particle with the use of photomicrographs, (2) grain size distribution, and (3) specific gravity, as well as (4) a complete chemical analysis of each bottom ash. Tests to evaluate the bottom ash as an aggregate and construction material included (1) sulfate soundness, (2) Los Angeles abrasion, (3) relative density, (4) standard Proctor compaction, (5) constant head permeability, (6) one-dimensional compression, and (7) shear strength. The various test values and properties are compared to the properties of representative granular soils or to appropriate specifications. Also included in the paper is a review of experience accumulated during the past 3 years on the utilization of bottom ash and boiler slag in actual construction in West Virginia and the surrounding States. It is concluded from the data presented that the properties of most bottom ashes and boiler slags compare favorably with those of conventional natural aggregates, and that these materials can be successfully utilized in one form or another in the construction industry.