Thesis Open Access

Use of Municipal Solid Waste Incinerator Bottom Ash with Stone Dust as Partial Replacement of Fine Aggregate in Concrete

Sewnet Dereje

Thesis supervisor(s)

Tesfaye Alemu ( PhD )

Concrete demand is increasing with time. So do demand of its constituent materials like
sand and cement is rising. Thus, there is always a need to look for alternative materials
to replace depletion of virgin input construction materials. This research work studies
use of municipal solid waste incinerator (MSWI) bottom ash with stone dust as partial
replacement of fine aggregate in concrete production. The solid waste incinerator
(MSWI) bottom ash comes from Addis Ababa Repi Waste to Energy Power Plant. This
plant is a leading national project commenced to prompt energy generation by recycling
city wastes.
Experimental program was designed for C25 concrete with various proportions of
municipal solid waste incinerator (MSWI) bottom ash with stone dust to sand. Fresh
and hardened concrete mechanical property tests were executed to investigate
performance gains of municipal solid waste incinerator (MSWI) bottom ash modified
concrete.
The results of the slump test of the mixes have shown that, as the amount of the MSWI
bottom ash with stone dust in the mixes increased, workability decreased. From the
recorded results, the hardened concrete strengths at 7 and 28 days of curing was
improved up to 50% replacement. Whereas, at 40% replacement, peak 20.13%, 19.82%
and 7.66% gain in compressive, flexural and shear strength was observed respectively.
In addition, as level of replacement increased unit weight of the hard concrete
decreased.

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