What is the identification of high purity silica fume products?
High-purity silica fume is a kind of highly effective active admixture, which can greatly improve the strength, permeability, frost resistance and durability of concrete. The characteristics of silica fume concrete have attracted attention, and silica fume concrete has been widely used in water conservancy and hydropower engineering, construction engineering, road engineering, bridge engineering.
What is the strong impact of durability of high purity silica fume?
The durability of concrete includes concrete frost resistance, permeability, chemical erosion resistance, resistance to steel erosion, impact resistance, etc., which only involves the effect on concrete frost resistance, permeability and chemical erosion resistance.
(i) Cold resistance: when silica fume content is less, the cold resistance of silica fume concrete is basically the same as that of ordinary concrete, and if the silica fume content is more than 15%, the cold resistance will be reduced. Through a large number of experiments, this view is basically confirmed. The main reason is that when the silicon exceeds 15%, the concrete expansion increases, the relative dynamic elasticity coefficient decreases, the compressive strength decreases sharply, and the internal characteristics of the concrete on the specific surface area is small, and the spacing coefficient is large.
II) impermeability: due to the small silica fume particles, 20 ~ 100 times smaller than the cement particles, can fill the voids in the middle of the concrete particles, so that the concrete is dense, at the same time, the second hydration of silica fume, the new product blocking the concrete infiltration channel, so the silica fume concrete impermeability is strong, and the permeability of the concrete with the increase of the gelatin ratio.
( iii) chemical erosion resistance: in the concrete mixed with silica fume can reduce the Ca (OH) 2 content, improve the density of concrete, improve the weak acid corrosion ability, but can not be used in the strong acid or the depth of the weak acid is high. Concrete's CSH decomposes in acids, so it is also resistant to salt corrosion, especially chloride salts. Reducing the rate of transport of harmful ions and decreasing the production of soluble Ca (OH) 2 and Calcium Alumina (3 CAO 3 CASO 4 32H2) increases the result of hydrated calcium silicate crystals.
As silicon metal is a hard and fragile material, filtration residues in the grinding process cannot be effectively controlled, overcrowding is serious, product wastage is serious, production cost is high, product particle size does not meet the standard, and the product becomes uncompetitive.
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