A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of milling and acid washing on the pozzolanic activity of incinerator sewage sludge ash
AbstractIncinerator sewage sludge ash (ISSA) is a problematic waste that contains significant levels of phosphates, primarily in the form of whitlockite (Ca3(PO4)2). Phosphate is a valuable finite resource, and a number of studies have shown that it can be extracted from ISSA by acid washing. This produces an acid washed residue that has potential to be used in construction products. The effects of milling and acid washing on the pozzolanic activity of ISSA have been evaluated using the strength activity index (SAI) test and the Frattini test. Coal fly ash (FA), metakaolin (MK) and quartz sand were also tested for comparison. Milling improved the pozzolanic activity of FA and ISSA according to both the SAI and Frattini tests. If ISSA is acid washed to recover phosphate, the process is likely to produce an acid insoluble material with little or no pozzolanic activity. The Frattini test is considered a more suitable method for directly assessing pozzolanic activity as a range of factors can affect SAI test results.
Effect of milling and acid washing on the pozzolanic activity of incinerator sewage sludge ash
AbstractIncinerator sewage sludge ash (ISSA) is a problematic waste that contains significant levels of phosphates, primarily in the form of whitlockite (Ca3(PO4)2). Phosphate is a valuable finite resource, and a number of studies have shown that it can be extracted from ISSA by acid washing. This produces an acid washed residue that has potential to be used in construction products. The effects of milling and acid washing on the pozzolanic activity of ISSA have been evaluated using the strength activity index (SAI) test and the Frattini test. Coal fly ash (FA), metakaolin (MK) and quartz sand were also tested for comparison. Milling improved the pozzolanic activity of FA and ISSA according to both the SAI and Frattini tests. If ISSA is acid washed to recover phosphate, the process is likely to produce an acid insoluble material with little or no pozzolanic activity. The Frattini test is considered a more suitable method for directly assessing pozzolanic activity as a range of factors can affect SAI test results.
Effect of milling and acid washing on the pozzolanic activity of incinerator sewage sludge ash
Donatello, S. (author) / Freeman-Pask, A. (author) / Tyrer, M. (author) / Cheeseman, C.R. (author)
Cement and Concrete Composites ; 32 ; 54-61
2009-09-11
8 pages
Article (Journal)
Electronic Resource
English
Effect of milling and acid washing on the pozzolanic activity of incinerator sewage sludge ash
| Online Contents | 2010
Pozzolanic characteristics of pulverized incinerator bottom ash slag
| British Library Online Contents | 2008
Pozzolanic characteristics of pulverized incinerator bottom ash slag
| Elsevier | 2006
Pozzolanic characteristics of pulverized incinerator bottom ash slag
| Online Contents | 2008