Micro silicon powder with an average particle size of 0.1um, only cement average particle size of hundreds of, cement concrete can well filled in the cement particle gap, paste is more dense. Micro silicon powder has volcano ash effect and excellent particle effect, can improve the workability of fresh concrete weepage and cohesion. The main function is:
Increase in strength: with micro silicon powder to replace part of cement concrete added, increased density and cohesion, concrete compressive flexural strength is greatly enhanced, the incorporation of 5% ~ 10% of the micro silicon powder, the compressive strength can be increased by 10% ~ 30%, flexural strength is increased by more than 10%.
(2) to increase density: micro silica fume can uniformly filling in the cement particle gap, make the concrete more dense, overcome the common concrete void defects, of water permeability, carbonation depth tested results show, anti permeability can be increased by 5 to 18 times, anti carbonization ability improve more than 4 times.
The frost resistance of concrete: micro silicon powder after 300 ~ 500 times of freezing and thawing cycles, the relative dynamic elastic modulus decreases by 1% - 2%.
After the early strength of micro silica fume added to concrete, and the free Ca (OH) 2 combined so as to reduce the Ca + 2 and oh - concentration, the induction period is shortened, and promote C2S hydration, the micro silica fume concrete early strength characteristics.
The impact grinding, cavitation resistance: micro silica fume concrete than ordinary concrete impact grinding capacity of 0.5 ~ 2.5 times, anti cavitation ability is improved by 3 to 16 times.
Because of the micro silicon powder has excellent properties of high fineness, high activity, high purity, in many areas is gradually understanding, has broad prospects for development and application as a new product.
