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A platform for research: civil engineering, architecture and urbanism
Scientific and technical aspects of blended cement matrices containing activated slate wastes
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.
Scientific and technical aspects of blended cement matrices containing activated slate wastes
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.
Scientific and technical aspects of blended cement matrices containing activated slate wastes
Frías, M. (author) / Vigil de la Villa, R. (author) / García, R. (author) / de Soto, I. (author) / Medina, C. (author) / Sánchez de Rojas, M.I. (author)
Cement and Concrete Composites ; 48 ; 19-25
2014-01-09
7 pages
Article (Journal)
Electronic Resource
English
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