Pulverized-fuel ash for concrete: Compositional characterisation of United Kingdom PFA
✍ Scribed by F.H. Hubbard; R.K. Dhir; M.S. Ellis
- Book ID
- 102996108
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 715 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0008-8846
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✦ Synopsis
Major oxide and component modal analyses show the composition of the pulverized-fuel ash produced over five days from each of 26 U.K. sources to remain virtually constant. Recurrent compositional differences do, however, exist between sources. These largely reflect different proportions of illite and kaolinite in the clay impurity of the coals burnt Due to the fluxing action of K20, there is greater production of silicate glass (pozzolana) from illite than kaolinite. The molar ratio of potash to alumina (K/A) reflects the relative proportions of illite and kaolinite and is directly proportional to the concentration of pozzolana in PFA. It thus provides a Pozzolanic Potential Index (PPI) which allows compositional characterisation of PFA for use in concrete.