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Scientific and technical aspects of blended cement matrices containing activated slate wastes.
- Source :
-
Cement & Concrete Composites . Apr2014, Vol. 48, p19-25. 7p. - Publication Year :
- 2014
-
Abstract
- The extraction of slate for use as a construction material generates large quantities of waste (between 75% and 90% in weight), which are dumped on landfill sites, with the ensuing technical, economic, environmental, and social problems. One possible way of reusing this raw waste is through its thermal activation to produce a new cementitious material for the manufacture of eco-efficient cements. An assessment is presented in this study of the chemical, mineralogical and pozzolanic properties of ash waste, activated at 1000°C over 2h, as well as a study of the main technical properties of blended cements prepared with 10% and 20% slate ash. The results show the high pozzolanic activity of the slate ash, principally over the seven first days, forming CSH gels as a principal hydrated phase of the pozzolanic reaction, followed by randomly interstratified chlorite/smectite phases and monosulfoaluminate [C3A·SO4Ca·12H2O]. These blended cements prepared with 10% and 20% activated slate waste comply with both the physical and the mechanical requirements of current European standards. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09589465
- Volume :
- 48
- Database :
- Academic Search Index
- Journal :
- Cement & Concrete Composites
- Publication Type :
- Academic Journal
- Accession number :
- 94693584
- Full Text :
- https://doi.org/10.1016/j.cemconcomp.2014.01.002