heavy density silica fume for guest houses

After pouring concrete, water is often produced from the phenomenon of separation of concrete, that is, the formation of water film in the surface layer, also known as floating slurry, so that the upper layer of concrete is unevenly distributed, affecting the quality of construction. Foreign research has proved that the amount of silica fume, i.e., substitution rate Si/(Si+C), the more concrete materials, the more difficult to segregate and water secretion. When the substitution rate of 15%, even if the concrete slump 15 ~ 20cm almost does not produce segregation and water secretion. When the substitution rate reaches 20%~30%, it is not easy to produce segregation even if the concrete is put into water directly. Due to the improvement of segregation and water seepage properties of concrete by silica fume, the concrete mixed with silica fume can be used in harbours, tunnels and other underwater projects.