A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Activated Calcined Clays as Cement Main Constituent
Within three research projects, VDZ was able to show the performance of several calcined impure clays as supplementary cementitious materials (SCM). The used kaolinitic, illitic, and chloritic clays indicated low ceramic qualities and represented typical clays of cement plant quarries. Even suitable calcination conditions led to acceptable pozzolanic reactivity of the calcined clays. Illitic clay of low quality was mixed with few amounts of CaO added as limestone and calcined at different temperatures to investigate the influences of CaO addition on pozzolanic activation of the clay. The obtained samples were analyzed concerning their mineralogical composition and their amounts of reactive components. These activated calcined clays were used as SCM to mix laboratory cements with 20 and 40 mass % of calcined clay and were subjected to cement performance tests. The procedure may offer an opportunity to improve the quality of calcined clays for use as SCM produced with clays of lower quality. Currently, research is done to use, e.g., bypass dusts as clay activating calcium source to find another suitable valorization of by-products from the clinker production.
Activated Calcined Clays as Cement Main Constituent
Within three research projects, VDZ was able to show the performance of several calcined impure clays as supplementary cementitious materials (SCM). The used kaolinitic, illitic, and chloritic clays indicated low ceramic qualities and represented typical clays of cement plant quarries. Even suitable calcination conditions led to acceptable pozzolanic reactivity of the calcined clays. Illitic clay of low quality was mixed with few amounts of CaO added as limestone and calcined at different temperatures to investigate the influences of CaO addition on pozzolanic activation of the clay. The obtained samples were analyzed concerning their mineralogical composition and their amounts of reactive components. These activated calcined clays were used as SCM to mix laboratory cements with 20 and 40 mass % of calcined clay and were subjected to cement performance tests. The procedure may offer an opportunity to improve the quality of calcined clays for use as SCM produced with clays of lower quality. Currently, research is done to use, e.g., bypass dusts as clay activating calcium source to find another suitable valorization of by-products from the clinker production.
Activated Calcined Clays as Cement Main Constituent
RILEM Bookseries
Bishnoi, Shashank (editor) / Schulze, Simone Elisabeth (author) / Pierkes, Roland (author) / Rickert, Joerg (author)
2020-04-14
7 pages
Article/Chapter (Book)
Electronic Resource
English
Activated Calcined Clays as Cement Main Constituent
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