A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Properties of MSW fly ash-calcium sulfoaluminate cement matrix and stabilization/solidification on heavy metals
In the paper, investigations were undertaken to formulate the properties of fly ash-calcium sulfoaluminate (CSA) cement matrix by blending municipal solid waste (MSW) fly ash with CSA cement. The compressive strength, pore structure, hydration phases, and leaching behavior of Zn and Pb doped MSW fly ash-CSA cement matrices were determined by XRD, MIP, DSC, FTIR, EDX, TCLP leaching test and other experiments. The results showed that the addition of MSW fly ash to form fly ash-CSA cement matrix reduced the compressive strengths of matrices and made the pore distribution of matrices coarser, compared to that of pure CSA cement matrix. However, fly ash-CSA cement matrix could effectively immobilize high concentration of heavy metal such as lead and zinc with much lesser leaching of TCLP. Besides ettringite AFt, Friedel phase was a new hydration phase formed in the matrix. The formation of these hydration phases was responsible for huge reservoir of heavy metal stabilization by chemical fixing. Therefore, it could be postulated that MSW fly ash-CSA cement matrix was a potential new constituent of S/S matrix for high concentration of heavy metals such as Zn and Pb ions.
Properties of MSW fly ash-calcium sulfoaluminate cement matrix and stabilization/solidification on heavy metals
In the paper, investigations were undertaken to formulate the properties of fly ash-calcium sulfoaluminate (CSA) cement matrix by blending municipal solid waste (MSW) fly ash with CSA cement. The compressive strength, pore structure, hydration phases, and leaching behavior of Zn and Pb doped MSW fly ash-CSA cement matrices were determined by XRD, MIP, DSC, FTIR, EDX, TCLP leaching test and other experiments. The results showed that the addition of MSW fly ash to form fly ash-CSA cement matrix reduced the compressive strengths of matrices and made the pore distribution of matrices coarser, compared to that of pure CSA cement matrix. However, fly ash-CSA cement matrix could effectively immobilize high concentration of heavy metal such as lead and zinc with much lesser leaching of TCLP. Besides ettringite AFt, Friedel phase was a new hydration phase formed in the matrix. The formation of these hydration phases was responsible for huge reservoir of heavy metal stabilization by chemical fixing. Therefore, it could be postulated that MSW fly ash-CSA cement matrix was a potential new constituent of S/S matrix for high concentration of heavy metals such as Zn and Pb ions.
Properties of MSW fly ash-calcium sulfoaluminate cement matrix and stabilization/solidification on heavy metals
Eigenschaften einer Zementmatrix aus Flugasche von Müllverbrennungsanlagen und Calciumsulfoaluminat sowie deren Stabilisierung/Erstarrung auf Schwermetallen
Qian, G.R. (author) / Shi, J. (author) / Cao, Y.L. (author) / Xu, Y.F. (author) / Chui, P.C. (author)
Journal of Hazardous Materials ; 152 ; 196-203
2008
8 Seiten, 7 Bilder, 4 Tabellen, 18 Quellen
Article (Journal)
English
Flugaschenzement , Erstarrung , Schwermetalle , Druckfestigkeit , Porenstruktur , Hydratation , Auslaugen (Mineralogie) , Dotieren (Fremdatomzusatz) , XRD (Röntgenstrahlbeugung) , DSK (Differenzialscanning-Kalorimetrie) , FTIR-Spektroskopie , EDXS (energiedispersive Röntgenspektrometrie) , Stabilisierung , Müllverbrennung
Immobilization of heavy metals by calcium sulfoaluminate cement
| Online Contents | 2005
Immobilization of heavy metals by calcium sulfoaluminate cement
| Tema Archive | 2005
Immobilization of heavy metals by calcium sulfoaluminate cement
| Elsevier | 2005
Immobilization of heavy metals by calcium sulfoaluminate cement
| British Library Online Contents | 2005
Stabilization of automotive shredder residue by calcium sulfoaluminate cement
| Tema Archive | 2004