Municipal seawage sludge (MSS) from municipal wastewater treatments plants (WWTP) of different size were thermally transformed into powders which were pressed into specimens submitted to thermodilatometric tests in order to evaluate their shrinkage and then their softening temperatures on heating up to 1100degreesC. In addition the shrinkage behaviour of a traditional clay normally used for the production of bricks was studied. Powders from calcined MSS were also attrition milled for 1 or 3 h and the behaviour of the relative samples was compared to that of he as calcined products. Specimens obtained by the various treatments were also sintered in an oven at different temperatures for 1 h, their density and their composition were determined and finally they were aged in an acidic (HCI) water solution to evaluate the eventual elution of, e components.
