effect of microsilica on physical properties of reinforced cement-pg电玩城

 microsilica is a by-product of the process of smelting silicon and ferrosilicon alloy, and is widely used as an active mineral admixture in cement-based composite materials. it is mainly used in concrete to improve the physical properties of concrete. with durability. as a major category of cement-based composites, fiber-reinforced cement has not seen the research and application of microsilica in this respect.

  the effect of microsilica on the physical properties of fiber reinforced cement, and its mechanism of action and its optimum dosage in production applications. at the same time, several problems that are common in the production of microsilica have been further studied. in order to ensure the microsilica to play a better role in fiber reinforced cement, self-made microsilica slurry is used, and there is a certain degree of difference in the data due to the influence of climatic conditions.

  the test specimens of different types of fiber reinforced cements are not formed on the same day, the maintenance system may have large fluctuations, and the test data of physical properties are incomparable. meanwhile, in order to minimize the error, the same type of fiber reinforced cement specimens are the same. day molding, the maintenance system must be the same, and their physical properties can be compared. addition method: silica fume concrete and castables should be constructed by the laboratory. construction in strict accordance with the mix ratio. in the mixing of silica fume concrete, the silica fume should be added to the mixer immediately after the aggregate is charged. there are two ways to join:

(1) inject the aggregate, then add the silica fume and dry mix of the cement, then add water and other admixtures.

(2) inject coarse aggregate 75% water silica fume 50% fine aggregate, stir for 15-30 seconds, then put in cement admixture 50% fine aggregate 25% water, stir until uniform. the mixing time is 20-25% or 50-60 seconds longer than ordinary concrete. never add silicon powder to the concrete that has been mixed.

construction method: 

there is no significant difference between the construction methods of silica fume concrete and ordinary concrete, but it is necessary to organize and vibrate well in construction. the early strength of the silica fume concrete will make the final setting time advance, and should pay attention when the surface is wiped; at the same time, the addition of silica fume will increase the viscosity of the concrete and greatly reduce the bleeding, making the surface slightly difficult.

microsilica concrete used in water conservancy projects can improve the crack resistance of engineering hydraulic concrete cracks, which has become a major concern. the reason for the crack is due to the hydration heat of the material itself, such as the incorporation of fly ash into the concrete, although the heating temperature can be lowered, but the early strength is relatively low, so that the amount of fly ash is limited.