First, the use of products
Micro silica also called silica fume or condensed silica fume, the main ingredients of silica. Microsilica can fill the pores between the cement particles, for reducing cement filler. The hydration products and generating gel, and alkaline material oxidation reaction of magnesium generating gel can improve the thermal stability of the oil well cement.

Two, technical requirements

Project	Index
Appearance	Gray or gray white solid powder
Density，g/cm3	2.0～2.4
Free liquid reduction rate,%	≥50
Ratio of compressive strength	≥1.00

Three, the use of methods
Dosage: the average adding amount is 5 ~ 15%, the concrete adding quantity according to the actual condition of the field or design. Silica fume method consists of mixing and mixing,
1. In addition, in the premise of constant amount of water added, a silica fume can replace 3-5 portions of cement (W) and keep the compressive strength of concrete invariant and improve other properties of concrete.
2. The addition of silica fume can significantly improve the strength and other properties of concrete with the addition of silica fume. The addition of silica fume concrete with slump loss, this need to pay attention to when the mix ratio test. With the use of water reducing agent and silica fume to be recommended, fly ash and slag to improve the construction of.

Four, storage and transportation
1 this product should be stored in dry and rain and sun shading environment. Loss of product in case of water agglomeration. Ban long periods of time in the sun, so as to avoid the weathering of packaging bags, products outside the.
2 transport and handling should be light light unloading, packaging to prevent breakage. Transport should be covered, this product is not dangerous goods, the transport can be according to the "non - dangerous goods rules" for.

Five, matters needing attention
Silica fume concrete construction safety should be strictly in accordance with the concrete engineering of national construction standards for operations, but because of the silica fume is lighter, is strictly prohibited high spilled material, silica fume is prevented from flying.
In the use of the process, the staff should wear labor protection supplies.