A paper contributed to and selected by the JOURNAL, authored by Ronald D. Watt, res. engr., environ, equipment div., FMC Corp. (Associate Member, AWWA), Itasca, III.; and Donald I. Angelbeck (Active Member, AWWA), assoc. prof., civ. engr. dept., Univ. of Toledo, Toledo, Ohio.Recent and future environmental regulations created a critical need for new environmentally sound sludgedisposal techniques in the water-supply field. Several sludge-disposal concepts utilizing sludge as a raw material for product manufacture could serve as a basis for meeting this need. This article describes research on the use of water coagulation-softening sludge as a raw material for the manufacture of pozzolanic road-base construction material.