This study replaced natural fine aggregate with a fine aggregate of washed municipal solid waste incinerator bottom ash (WMSWIBS) in the production of compressed mortar paving units to explore the feasibility of using WMSWIBS in this application. Cement-aggregate ratios (c/a) of 0.1, 0.2, 0.3, 0.4, and 0.5 and water-cement ratios (w/c) of 0.20, 0.25, and 0.30 were selected. The results yielded a specific gravity of 2.21, aggregate absorption of 9.6%, and a fineness modulus of 3.2. The WMSWIBS's toxicity characteristic leaching procedure (TCLP) values were much lower than the limit specified by the Environmental Protection Administration (EPA, Taiwan), and its heavy metals content after the water wash was lower than that before the wash. The water absorption ranged from 5.49-13.55%, the porosity from 2.44-8.05%, the compressive strength from 12.3-45.4 MPa, the ultrasonic pulse velocity from 1,521-2,961 m/sec, and the attrition volume loss from 27.2-117.7 cm3 /50 cm2 . The results suggested that the compressive strength and ultrasonic pulse velocity increased with the cement-aggregate ratio, while the attrition loss decreased.

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