Kaolin from a Serbian deposit, having a high content of mica and quartz, disordered kaolinite and a high specific surface area, was used to prepare metakaolin (MK). The calcination at temperatures of 700 °C or 750 °C for 30 to 180 min resulted in MK having high pozzolanic activity, but also significant aglomeration of particles. In order to disperse aglomerates, MK was milled, which resulted in increased pozzolanic activity and reduced particle size. The effects of MK and additionally milled metakaolin (MKmill) on the composite strengths and microstructure of the pastes were compared. We prepared and investigated composites in which ordinary Portland cement (OPC) was replaced with 10% to 50% of MK or MKmill, as well as the representative samples of paste for determination of microstructure.
Compressive strengths higher than the control were obtained for composites having up to 30% of MK and up to 40% of MKmill, respectively. Increase of composite strengths with MKmill was more prono...unced at lower cement replacement levels (10% and 20%).
Compressive strength of composites containing agglomerated MK were satisfactory, which suggests that milling of MK, as well as purification of kaolin, may not be necessary.
TY - CONF
AU - Ilić, Biljana
AU - Mitrović, Aleksandra
AU - Radonjanin, Vlastimir
AU - Malešev, Mirjana
AU - Zdujić, Miodrag
PY - 2018
UR - https://dais.sanu.ac.rs/123456789/2376
AB - Kaolin from a Serbian deposit, having a high content of mica and quartz, disordered kaolinite and a high specific surface area, was used to prepare metakaolin (MK). The calcination at temperatures of 700 °C or 750 °C for 30 to 180 min resulted in MK having high pozzolanic activity, but also significant aglomeration of particles. In order to disperse aglomerates, MK was milled, which resulted in increased pozzolanic activity and reduced particle size. The effects of MK and additionally milled metakaolin (MKmill) on the composite strengths and microstructure of the pastes were compared. We prepared and investigated composites in which ordinary Portland cement (OPC) was replaced with 10% to 50% of MK or MKmill, as well as the representative samples of paste for determination of microstructure.
Compressive strengths higher than the control were obtained for composites having up to 30% of MK and up to 40% of MKmill, respectively. Increase of composite strengths with MKmill was more pronounced at lower cement replacement levels (10% and 20%).
Compressive strength of composites containing agglomerated MK were satisfactory, which suggests that milling of MK, as well as purification of kaolin, may not be necessary.
PB - Dordrecht : Springer
C3 - Calcined Clays for Sustainable Concrete: Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete
T1 - Compressive Strength Improvements of Cement-Based Composites Achieved with Additional Milling of Metakaolin
SP - 212
EP - 218
DO - 10.1007/978-94-024-1207-9_34
UR - https://hdl.handle.net/21.15107/rcub_dais_2376
ER -
@conference{
author = "Ilić, Biljana and Mitrović, Aleksandra and Radonjanin, Vlastimir and Malešev, Mirjana and Zdujić, Miodrag",
year = "2018",
abstract = "Kaolin from a Serbian deposit, having a high content of mica and quartz, disordered kaolinite and a high specific surface area, was used to prepare metakaolin (MK). The calcination at temperatures of 700 °C or 750 °C for 30 to 180 min resulted in MK having high pozzolanic activity, but also significant aglomeration of particles. In order to disperse aglomerates, MK was milled, which resulted in increased pozzolanic activity and reduced particle size. The effects of MK and additionally milled metakaolin (MKmill) on the composite strengths and microstructure of the pastes were compared. We prepared and investigated composites in which ordinary Portland cement (OPC) was replaced with 10% to 50% of MK or MKmill, as well as the representative samples of paste for determination of microstructure.
Compressive strengths higher than the control were obtained for composites having up to 30% of MK and up to 40% of MKmill, respectively. Increase of composite strengths with MKmill was more pronounced at lower cement replacement levels (10% and 20%).
Compressive strength of composites containing agglomerated MK were satisfactory, which suggests that milling of MK, as well as purification of kaolin, may not be necessary.",
publisher = "Dordrecht : Springer",
journal = "Calcined Clays for Sustainable Concrete: Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete",
title = "Compressive Strength Improvements of Cement-Based Composites Achieved with Additional Milling of Metakaolin",
pages = "212-218",
doi = "10.1007/978-94-024-1207-9_34",
url = "https://hdl.handle.net/21.15107/rcub_dais_2376"
}
Ilić, B., Mitrović, A., Radonjanin, V., Malešev, M.,& Zdujić, M.. (2018). Compressive Strength Improvements of Cement-Based Composites Achieved with Additional Milling of Metakaolin. in Calcined Clays for Sustainable Concrete: Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete
Dordrecht : Springer., 212-218.
https://doi.org/10.1007/978-94-024-1207-9_34
https://hdl.handle.net/21.15107/rcub_dais_2376
Ilić B, Mitrović A, Radonjanin V, Malešev M, Zdujić M. Compressive Strength Improvements of Cement-Based Composites Achieved with Additional Milling of Metakaolin. in Calcined Clays for Sustainable Concrete: Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete. 2018;:212-218.
doi:10.1007/978-94-024-1207-9_34
https://hdl.handle.net/21.15107/rcub_dais_2376 .
Ilić, Biljana, Mitrović, Aleksandra, Radonjanin, Vlastimir, Malešev, Mirjana, Zdujić, Miodrag, "Compressive Strength Improvements of Cement-Based Composites Achieved with Additional Milling of Metakaolin" in Calcined Clays for Sustainable Concrete: Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete (2018):212-218,
https://doi.org/10.1007/978-94-024-1207-9_34 .,
https://hdl.handle.net/21.15107/rcub_dais_2376 .
