Abstract
The use of fly ash & hazardous solid waste to concrete production is environmental friendly because it contributes to reducing the consumption of natural resources, the pollution concrete production generates and the power it consumes. This paper presents study of fly ash & hazardous solid waste (sludge) as raw material for use in concrete. The concrete specimens were prepared according M15 grade (1:2:4) of concrete. Concrete samples were made with different percentage of fly ash & Sludge additions (relative to the cement weight) and engineering and microstructural properties were investigated, i.e., compressive strength and XRD. Tests are carried out after 7, 28 and 90 cured of the specimens. The mean compressive strength required at a specific age, usually 28 days, determines the nominal water/cement ratio of the mix. Compressive strength of developed concrete for 7 days cured samples 2.2 – 6.5 MPa, 28 days cured 3.5 – 9.0 MPa, 90 days cured 4.6 – 10.4 MPa respectively. CSH, portlandite, ettringite, CH, Al2O3 etc. was clearly detected as a predominant crystalline phase in developed concrete matrix. Factors affecting unconfined compressive strength of developed concrete are: by-product (fly ash), waste (sludge), waste/binder ratio, water/cement ratio, curing days. Reuse of heavy metal containing sludge, as alternative concrete material could be a promising alternative for the management of waste sludge.
Key-Words / Index Term
Heavy Metals, Compressive Strength, By-Product, XRD, crystalline structure
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