Cement-fly ash stabilisation/solidification of contaminated soil

Performance properties and initiation of operating envelopes

Reginald Kogbara, Abir Al-Tabbaa, Yaolin Yi, Julia A. Stegemann

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

This study was aimed at evaluating the mechanical and pH-dependent leaching performance of a mixed contaminated soil treated with a mixture of Portland cement (CEMI) and pulverised fuel ash (PFA). It also sought to develop operating envelopes, which define the range(s) of operating variables that result in acceptable performance. A real site soil with low contaminant concentrations, spiked with 3000mg/kg each of Cd, Cu, Pb, Ni and Zn, and 10,000mg/kg of diesel, was treated with one part CEMI and four parts PFA (CEMI:PFA=1:4) using different binder and water contents. The performance was assessed over time using unconfined compressive strength (UCS), hydraulic conductivity, acid neutralisation capacity (ANC) and pH-dependent leachability of contaminants. With binder dosages ranging from 5% to 20% and water contents ranging from 14% to 21% dry weight, the 28-day UCS was up to 500kPa and hydraulic conductivity was around 10-8m/s. With leachant pH extremes of 7.2 and 0.85, leachability of the contaminants was in the range: 0.02-3500mg/kg for Cd, 0.35-1550mg/kg for Cu, 0.03-92mg/kg for Pb, 0.01-3300mg/kg for Ni, 0.02-4010mg/kg for Zn, and 7-4884mg/kg for total petroleum hydrocarbons (TPHs), over time. Design charts were produced from the results of the study, which show the water and/or binder proportions that could be used to achieve relevant performance criteria. The charts would be useful for the scale-up and design of stabilisation/solidification (S/S) treatment of similar soil types impacted with the same types of contaminants.

Original languageEnglish
Pages (from-to)64-75
Number of pages12
JournalApplied Geochemistry
Volume33
DOIs
Publication statusPublished - Jun 2013
Externally publishedYes

Fingerprint

Ashes
Coal Ash
pulverized fuel ash
solidification
Pulverized fuel
Fly ash
fly ash
Solidification
Cements
stabilization
cement
Stabilization
Impurities
Binders
Soils
pollutant
Hydraulic conductivity
compressive strength
Water content
Compressive strength

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Geochemistry and Petrology

Cite this

Cement-fly ash stabilisation/solidification of contaminated soil : Performance properties and initiation of operating envelopes. / Kogbara, Reginald; Al-Tabbaa, Abir; Yi, Yaolin; Stegemann, Julia A.

In: Applied Geochemistry, Vol. 33, 06.2013, p. 64-75.

Research output: Contribution to journalArticle

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