Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix

R Cioffi, L Maffucci, L Santoro, F P Glasser

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The application of cement-based stabilisation/solidification treatment to organic-containing wastes is made difficult by the adverse effect of organics on cement hydration. The use of organophilic clays as pre-solidification adsorbents of the organic compounds can reduce this problem because of the high adsorption power of these clays and their compatibility with the cementitious matrix. This work presents an investigation of the effect on hydration kinetics, physico-mechanical properties and leaching behaviour of cement-based solidified waste forms containing 2-chlorophenol and 1-chloronapthalene adsorbed on organophilic bentonites. These were prepared by cation exchange with benzyldimethyloctadecylammonium chloride and trimethyloctadecylammonium chloride. The binder was a 30% pozzolanic cement, 70% granulated blast furnace slag mixture. Several binder-to-bentonite ratios and different concentrations of the organics on the bentonite were used. Kinetics of hydration were studied by measurement of chemically bound water and by means of thermal and calorimetric analyses. Microstructure and other physico-mechanical properties of the solidified forms were studied by means of mercury intrusion porosimetry, scanning electron microscopy and unconfined compressive strength measurement. Leaching was checked by two different leaching tests: one dynamic, on monolithic samples, and the other static, on powdered samples. This study indicates that the incorporation of the organic-loaded bentonite in the binder matrix causes modifications in the hardened samples by altering cement hydration. The effects of the two organic contaminants are differentiated. (C) 2001 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)651-660
Number of pages10
JournalWaste Management
Volume21
Publication statusPublished - 2001

Keywords

  • organophilic bentonite
  • chloro-organics
  • adsorption
  • stabilization
  • slag cement
  • HYDROPHOBIC LAYER SILICATES
  • ALCOHOL-BENZENE MIXTURES
  • INDUSTRIAL-WASTES
  • CLAY-MINERALS
  • ADSORPTION
  • SOLIDIFICATION
  • ADSORBENTS
  • ISOTHERMS
  • SORPTION
  • SURFACE

Cite this

Cioffi, R., Maffucci, L., Santoro, L., & Glasser, F. P. (2001). Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix. Waste Management, 21, 651-660.

Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix. / Cioffi, R ; Maffucci, L ; Santoro, L ; Glasser, F P .

In: Waste Management, Vol. 21, 2001, p. 651-660.

Research output: Contribution to journalArticle

Cioffi, R, Maffucci, L, Santoro, L & Glasser, FP 2001, 'Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix', Waste Management, vol. 21, pp. 651-660.
Cioffi, R ; Maffucci, L ; Santoro, L ; Glasser, F P . / Stabilization of chloro-organics using organophilic bentonite in a cement-blast furnace slag matrix. In: Waste Management. 2001 ; Vol. 21. pp. 651-660.
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AB - The application of cement-based stabilisation/solidification treatment to organic-containing wastes is made difficult by the adverse effect of organics on cement hydration. The use of organophilic clays as pre-solidification adsorbents of the organic compounds can reduce this problem because of the high adsorption power of these clays and their compatibility with the cementitious matrix. This work presents an investigation of the effect on hydration kinetics, physico-mechanical properties and leaching behaviour of cement-based solidified waste forms containing 2-chlorophenol and 1-chloronapthalene adsorbed on organophilic bentonites. These were prepared by cation exchange with benzyldimethyloctadecylammonium chloride and trimethyloctadecylammonium chloride. The binder was a 30% pozzolanic cement, 70% granulated blast furnace slag mixture. Several binder-to-bentonite ratios and different concentrations of the organics on the bentonite were used. Kinetics of hydration were studied by measurement of chemically bound water and by means of thermal and calorimetric analyses. Microstructure and other physico-mechanical properties of the solidified forms were studied by means of mercury intrusion porosimetry, scanning electron microscopy and unconfined compressive strength measurement. Leaching was checked by two different leaching tests: one dynamic, on monolithic samples, and the other static, on powdered samples. This study indicates that the incorporation of the organic-loaded bentonite in the binder matrix causes modifications in the hardened samples by altering cement hydration. The effects of the two organic contaminants are differentiated. (C) 2001 Elsevier Science Ltd. All rights reserved.

KW - organophilic bentonite

KW - chloro-organics

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KW - stabilization

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KW - ALCOHOL-BENZENE MIXTURES

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KW - CLAY-MINERALS

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KW - SORPTION

KW - SURFACE

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JO - Waste Management

JF - Waste Management

SN - 0956-053X

ER -