Improving the dispersion of silica fume in cement pastes and mortars

International Conference Building Materials, Products and Technologies

材料科学;工业技术（总论）

Janca, M.^1 ; Siler, P.^1 ; Opravil, T.^1 ; Kotrla, J.^1

Brno University of Technology, Faculty of Chemistry, Materials Research Centre, Purkyova 464/118, Brno

61200, Czech Republic^1

关键词: Coarse aggregates;    Concrete properties;    Fine aggregates;    Ordinary portland concretes (OPC);    Reactive aggregate;    Reactive surfaces;    Superplasticizers;    Ultrasound technology;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012022/pdf
DOI  :  10.1088/1757-899X/583/1/012022

来源: IOP

【 摘 要 】

There are many possibilities how to improve concrete properties such as compressive strength, flexural strength, durability, and others. The change in the composition of ordinary Portland concrete (OPC) is one possible way. This change may result in the formation of concrete with added properties known as high-performance concrete (HPC). Traditional methods used to receive high-performance concrete design and manufacture emphasize the removal of coarse aggregates. This is achieved by using the specially sorted fine aggregates at relatively low doses along with super-plasticizers and silica fume. Problem with fine reactive aggregates is their agglomeration which causes reduction of the reactive surface. This work is focused on evaluation of the ultrasound technology for the dispersion of silica fume. For comparison, different cement mixtures were prepared to study the effects of the treatment of silica fume prior to its use in HPC applications.