Properties of Compacted Sewage Ash

by Donald H. Gray, (A.M.ASCE), Assoc. Prof. of Civ. Engrg.; Univ. of Michigan, Ann Arbor, MI,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 2, Pg. 439-451

Document Type: Journal Paper


Properly compacted sewage ash from a local treatment plant exhibits sufficient strength and stability to recommend its use on a trial basis as a backfill, lightweight structural fill, or subbase material. Lime is added during sewage treatment, and subsequently is concentrated in the ash residue as a result of incineration. The high lime content of the ash is largely responsible for its age-hardening properties and resistance to moisture and frost. The compaction characteristics of sewage ash are similar to those of a conventional soil, except that maximum dry densities are lower and optimum water contents about double. Use of compacted sewage ash in civil engineering practice would serve a two-fold purpose, viz., waste disposal on the one hand, and provision of a lightweight fill or embankment material on the other.

Subject Headings: Compaction (material) | Sewage | Ashes | Strength of materials | Fills | Lime | Compacted soils | Construction materials

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