Back to Search
Start Over
Alkali thermal fusion: A prospective route to enhance the reactivity of low-grade clay and utilize as supplementary cementitious material (SCM).
- Source :
-
Cement & Concrete Composites . Mar2024, Vol. 147, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Common clay deposits contain a variety of minerals that provide low and unpredictable reactivity even after calcination. This study aims to enhance the reactivity of such low-grade clay via alkali thermal fusion, where clay was co-calcined with different dosages of NaOH to achieve superior reactivity. The effects of such co-calcination on the formation of reactive aluminosilicates were monitored using high-temperature in-situ X-ray Diffraction (XRD). Additionally, the role of different alkali dosages on the characteristics of the calcined clays was studied using ex-situ XRD, FTIR, ICP-OES, and 29Si NMR. The co-calcination process significantly enhanced the Al and Si dissolution from the calcined clays, which subsequently improved their pozzolanic properties. All of the alkali-fused SCMs satisfied the modified strength activity index (SAI) requirement and the lower dosages of alkali-containing samples (5 % NaOH) showed 50 % reduction in expansion due to alkali silica reaction. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CLAY
*SUPPLY chain management
*ALKALIES
*X-ray diffraction
*ALUMINUM silicates
Subjects
Details
- Language :
- English
- ISSN :
- 09589465
- Volume :
- 147
- Database :
- Academic Search Index
- Journal :
- Cement & Concrete Composites
- Publication Type :
- Academic Journal
- Accession number :
- 175241167
- Full Text :
- https://doi.org/10.1016/j.cemconcomp.2023.105417