The effect of burnt lime addition on hydration of Ultra-high performance cementitious composites

International Conference Building Materials, Products and Technologies

材料科学;工业技术（总论）

Novotný, R.^1 ; Bartoniková, E.^1 ; Kotrla, J.^1

Institute of Materials Chemistry, Brno University of Technology, Purkyova 464/118, Brno

61200, Czech Republic^1

关键词: Hydration process;    Hydration reaction;    Induction periods;    Isothermal calorimetry;    Lime additions;    Ordinary Portland cement;    Pozzolanic reaction;    Ultra-high performance cementitious composite;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012004/pdf
DOI  :  10.1088/1757-899X/583/1/012004

来源: IOP

【 摘 要 】

The paper deals with the burnt lime utilization as a source of calcium ions participated during hydration process of ultra-high performance cementitious composites. These type of ultra-high performance cementitious composites are based on the high content of silica fume that together with calcium ions form the binder phase. In the case of ordinary Portland cement, the hydration during induction period supposed to be too slow for dissolution of required amount of calcium ions necessary for the pozzolanic reaction of presented silica fume. The low addition of the lime should be a sufficient calcium source that allow the starting of the pozzolanic reaction before the acceleration period occurs. The calcium ions content from the beginning of the reaction was controlled by an addition of soft-burnt and dead-burnt lime. Its influence was studied in terms of hydration process by isothermal calorimetry. Based on the experimental data, the hydration reaction mechanism was proposed.