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| Titel: |
Effect of added lignosulfonate superplasticizer on the solidification/stabilization of phenol using Portland cement type-V |
| Auteur: |
Lu, Felix Yousuf, M. Mollah, A. Hess, Thomas R. Cocke, David L. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 31 (1996) nr. 1 pagina's 183-209 |
| Jaar: |
1996-01 |
| Inhoud: |
This study explores the interaction of phenol, a significant organic pollutant, with cement and cement modified with a common superplasticizer, lignosulfonate. Samples of plain cement, cement doped with phenol, and superplasticized cement doped with phenol, have been examined by X-ray diffraction (XRD), fourier transform infrared spectroseopy (FT-IR) and scanning electron microscopy/ energy dispersive spectroseopy (SEM/EDS). Leachates of these samples have been examined by UV/VIS and GC/MS. Both phenol and (lignosulfonate + phenol) have been observed to retard the hydration of cement through specific surface chemical reactions. XRD and FT-IR results are consistent with surface calcium diphenoxide formation. Both phenol and (lignosulfonate + phenol) have been found to retard formation of Ca(OH)2 and stabilize ettringite. Leaching of admixture doped cement by water removed the phenol and lignosulfonate and caused complete hydration of cement. The Charge Dispersal Model (CDM) has been used to explain the role of the admixtures in cement. The results show that the S/S process for phenol by cement has not been significantly improved by superplasticizer addition. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 16 gevonden artikelen
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