HPC Cement materials prepared by mixing under reduced pressure

conference paper

English

This article deals with HPC (High Performance composite) materials where the main advantages are increased mechanical properties, durability and stability. The main parameter for achieving the properties is the water to binder coefficient. Improvement of the rheological properties can be achieved by adding the liquefying agents. The limiting parameter for such materials is the presence of air bubbles that cannot be removed just by the compacting. This is due to the reduced flow limit and high viscosity, which makes it difficult to degass the suspension. The use of degassing agents is insufficient in such samples. Mixing of cement mixtures under reduced pressure can be used to reduce porosity and eliminate the presence of air bubbles. Moreover, it is associated by improvement of the mechanical properties. The influence of preparation of HPC composite by mixing under the atmospheric pressure and by mixing under low pressure to parameters like mechanical properties, porosity, microstructure was studied in this paper. The porosity of the samples was analysed in a cross-section using an optical method.

HPC material, mixing, reduced pressure

VOJTÍŠEK, J.; NOVOTNÝ, R.; BARTONÍČKOVÁ, E.; HRUBÝ, P.; MARKO, M.; JANČA, M.

3. 6. 2020

IOP Publishing

Telč

1757-8981

IOP Conference Series: Materials Science and Engineering

United Kingdom of Great Britain and Northern Ireland

1

11

11

https://iopscience.iop.org/article/10.1088/1757-899X/1039/1/012010