Manufacture and performance of lightweight aggregate from municipal solid waste incinerator fly ash and reservoir sediment for self-consolidating lightweight concrete

Reservoir sediment, as the main material, was blended with municipal solid waste incinerator (MSWI) fly ash (including cyclone ash and scrubber ash) to manufacture lightweight aggregates (LWAs) using a pelletizing disk, and then sintering in a rotary kiln. The selected LWA was used as coarse aggregate for producing self-consolidating lightweight concrete (SCLWC). The results show that the maximum content of MSWI fly ash should be less than 30%. LWA with specific gravity in the range of 0.88–1.69 g/cm3 and crushing strength as high as 13.43 MPa can be produced. SCLWCs showed excellent flow-ability without bleeding or segregation. The 28-day compressive strengths of the SCLWCs ranged between 25 and 55 MPa. The electrical resistivity and ultrasonic pulse velocity of the SCLWCs satisfied the required values of 8.5 kΩ cm and 3600 m/s, respectively. Therefore, the SCLWCs produced in this study have good corrosion resistance and can be classified as good quality.