Open Access

ARTICLE

Characterization of the Omni-Processor Sewage Sludge Ash for Reuse as Construction Material

Prince Momar Gueye^1,2,*, Siham Kamali-Bernard², Dame Keinde¹, Fabrice Bernard², Vincent Sambou¹

1 LE3PI of E S P-UCAD, Dakar, Senegal
2 LGCGM of INSA of Rennes, Rennes, France

* Corresponding Author: Prince Momar Gueye. Email:

(This article belongs to the Special Issue: Materials and Energy an Updated Image for 2021)

Fluid Dynamics & Materials Processing 2022, 18(6), 1581-1593. https://doi.org/10.32604/fdmp.2022.022165

Received 23 February 2022; Accepted 28 April 2022; Issue published 27 June 2022

Abstract

Omni Processors (OP) are machines which use sludge as a fuel to generate electricity and clean water, but create ash at the same time. In the present study, fly ash and bottom ash are investigated as materials for potential reuse in the construction field. First, the granular size, density and Blaine finesse are determined. Then, the chemical composition and microstructure are obtained by means of X-ray fluorescence and Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), respectively. Finally, ashes reactivity is determined by two chemical methods (modified Chapelle test, bound water content R3) and a mechanical method (pozzolanic activity index). The characterization results indicate two material types: fly ash similar to cement and bottom ash similar to fine sand. That’s why the mortars mechanical strength with fly ash 0%-30% is better than that with bottom ash at the same rate. Fly ash slightly decreases the mechanical strength of mortars while bottom ash induces a much more significant decrease.

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Keywords

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