Effect of fly ash stabilization on strength properties of contaminated clay-sand soils

Author

Said, Khitam A. H.

Source

ZANCO Journal of Pure and Applied Sciences

Publisher

Salahaddin University-Erbil Department of Scientific Publications

Publication Date

2016-06-30

Country of Publication

Iraq

No. of Pages

7

Main Subjects

Agriculture

English Abstract

Calcium –based stabilization/solidification (S/S) is an effective and economic remediation technique to immobilize heavy metals in contaminated soils and sludges.

In the present study, flay ash was used as binder to stabilize lead and chromium present in clayey sand soils as artificial pollutants.

The strength properties of the compacted specimens, as determined during testing, formed the basis for evaluating both the degree of immobilization of the heavy metal contaminants and the reuse potential of the treated waste form.

Thus, in this study, the reusability of the stabilized waste forms in construction application was investigated by performing the unconfined compressive strength for stabilized contaminated sand-clay soils.

Nevertheless, the presence of these metals may lead to a more complicated strength development for stabilized soils as a result to interfere the contaminates with the process of stabilization.

The investigated admixtures were fly ash with lime; the amount of lime was fixed at 5 percent with the amount of fly ash 5, 10 and 15 percent.

The results from the experimental investigation show that by increasing the amount of fly ash the strength properties of lime-fly ash stabilized contaminated soils were improved in different length of curing time.

The control samples (stabilized soils without heavy metals) are also prepared for comparison purpose.

X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses were also implemented to elucidate the mechanisms responsible for immobilization of the heavy metals under study.

Data Type

Conference Papers

Record ID

BIM-786898

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