The Influence of Silica Fume Concentration on Capillary Porosity and Concrete Heat Conductivity

• Published in: 2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) pp. 1 - 3
• Main Authors: Kravtsova, O.N., Timofeev, A.M., Tappyrova, N.I., Protodyakonova, N.A.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 06-10-2020
• Subjects: Absorption; Additives; capillary porosity; concentration; Concrete; Conductivity; heat conductivity; Heat transfer; Industrial engineering; silica fume; Silicon compounds
• DOI: 10.1109/FarEastCon50210.2020.9271378

This paper presents the results of a study of the effect of the concentration of silica fume additive on the capillary porosity and thermal conductivity of concrete, depending on the age of concrete and the concentration of silica fume. It can be seen that with increasing age of concrete, the values of capillary porosity monotonously decrease, and by 28 days of hardening, the values of capillary porosity decrease by about 20%. In the first seven days, there is an increase in capillary porosity, and in the next - its decrease. The optimum concentration of silica fume admixture in concrete was established, at which a pore structure with the lowest values of capillary porosity is formed, which leads to the production of more durable concrete. The thermal conductivity is determined by two-point probing. The introduction of silica fume in the composition of the samples does not significantly affect their thermal conductivity.