The goal of this study was to use the LED sludge powder to replace
5–30 wt.% cement to mold LED sludge cement mortar (SBCM)
specimens for compressive strength test and other tests. These
specimens were compared to the ordinary Portland cement mortar
(OPCM) specimens. The following conclusions were drawn:
1. After 1–7 days of curing, the SBCM specimens have comparable
compressive strength with OPCM, and after 14–
90 days of curing, the SBCM specimens have 103–115%
the strength of the OPCM specimens. This result is comparatively
good in engineering practice.
2. The LED sludge powder contained nano-SiO2, which
enhances the strength of the SBCM specimens compared
to the OPCM specimens for the longer aging time because
nano-SiO2 behave as fillers and an activator that triggers
the pozzolanic reaction.