Many individuals are unclear about the fineness of microsilica powder. The fineness of microsilica powder is not composed of a single particle size, as many particles are bonded together due to compression or the force of static electricity. In experiments, an ultrasonic disperser is used to fully disperse the microsilica powder. Over 80% of the fineness of microsilica powder is less than 1μm, with an average particle size of 0.1 to 0.3μm and a specific surface area of 20 to 28 m²/g. Its fineness and specific surface area are approximately 80 to 100 times that of cement and 50 to 70 times that of fly ash.
In practical applications, microsilica powder can be effectively uniformly dispersed under the agitation of mixers and through the abrasive action of water in sand and stone materials. This process requires a certain amount of time for mixing, with the longer the mixing time, the better the dispersion and the stronger the effect. Conversely, insufficient mixing time results in poor dispersion and diminished effectiveness. Generally, mixing times are extended by a few minutes, but should not be overly prolonged. It is advisable to opt for a more economical and efficient compromise solution, with specific times determined through experimentation based on actual application and dosage.
