الفهرس 
Water Treatment Plant SludgeOnly 14 pages are availabe for public view
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Abstract
This investigation addresses the effect of sludge from water treatment
plants as partially replacing cement on the mechanical properties. Various
mixtures of sludge powder (SL) after heated treatment at 200°C, 300°C, and
500°C are produced by partially replacing cement with 0%, 5%, 10%, 15%,
20%, and 25 wt%. SL after heated treatment at 200°C with 0%, 5%, 10%, 15%,
20%, and 25 wt% was replaced with 10% liquid sodium silicate. The program
includes the substitution of cement with 5% un-hydrated lime and 10% silica
fume at sludge powder after heated treatment at 200°C with 0%, 5%, 10%, 15%,
20%, and 25 wt%. A series of laboratory tests were performed to investigate the
mechanization of strength development which included compressive strength,
splitting tensile, flexural strength, Scanning electron microscope (SEM), Energy
dispersive X-ray spectroscopy (EDX) and mapping. Generally, the treatment of
SL powder with increased heat has a positive effect on its strength. The
treatment of SL powder at 500°C improved the strength and the mechanical
properties compared with SL powder after heating at 200°C and 300°C. The
results showed that using 5%, 10% sludge in concrete increased the strength and
then decreased at 15-25% of sludge. Increase the heat treatment of the sludge
led to increasing the strength. The use of the sludge after heat treatment at 300°C
improved the strength more than the sludge after heat treatment at 200°C. The
use of the sludge after heat treatment at 500°C improved the strength and the
mechanical properties the most. The use of the sludge after heat treatment at
300°C and silica fume improved the strength and the mechanical properties
significantly.