The role of microsilica in concrete admixtures company Adding microsilica powder to concrete can increase the strength of concrete. If the cement is replaced by 10% silicon powder, the strength can be increased by 25%. In addition, the concrete can be more compact and improve the durability of...Send InquiryChat Now
The role of microsilica in concrete admixtures company
Adding microsilica powder to concrete can increase the strength of concrete. If the cement is replaced by 10% silicon powder, the strength can be increased by 25%. In addition, the concrete can be more compact and improve the durability of the concrete.
(1) Mechanism of action: When microsilica powder is mixed into concrete, the microsilica powder is in contact with water, and some small particles are quickly dissolved. The gel rich in SiO2-poor solution in the solution forms an adhesion layer on the surface of the silicon powder particles. After a certain period of time, The SiO2-rich and Ca-depleted gel adhesion layers begin to dissolve and Ca(OH) produced by cement hydration: reacts to form a C-S-H gel.
(2) Incorporation of microsilica powder can change some important physical properties of concrete. Microsilica powder particles can fill the pores of relatively large cement particles and reduce the volume of pores. However, the specific surface area of silicon powder has a greater impact on workability. Big. Therefore, the general amount of water is increased as the amount of silicon powder is increased. However, in order to keep the fluidity constant, it is generally necessary to add a superplasticizer or a superplasticizer while incorporating the silicon powder. Improved workability In the case of cement consumption <300 kg/rn', the addition of silicon powder can improve its cohesiveness and reduce the amount of bleeding. Because the specific surface area of silica fume is very large, many of the free water in fresh concrete is bound by the silica fume particles, which can greatly reduce the amount of bleeding. Thereby reducing the accumulation of moisture on the interface and improving the interface bonding performance.
(3) When the slump is large and the vibrating time is long, the silica fume concrete is not easily separated. Silica fume concrete increases the risk of plastic shrinkage cracking, especially at higher evaporation rates. Plastic shrinkage cracking can occur after pouring the surface until the concrete begins to solidify, mostly when the concrete approaches the initial setting. In order to prevent plastic cracking, the concrete must be covered to prevent rapid evaporation. The surface can be covered with sacks or plastic film or curing agent, or sprayed to reduce evaporation. Some special admixtures that delay evaporation have also been used to reduce plastic cracking. Danger.
Cases of microsilica in concrete admixtures company
For over-sea bridge
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