experience of adding microsilica in construction-pg电玩城

  in the process of high-temperature smelting of industrial silicon and ferro-silicon, the dust discharged with waste gas is known as silica fume or silica powder. its main component is that the sio2 content in flue gas accounts for about 90% of the total amount of soot, and the free sio2 content is about 10%. the particle degree is very small, and the average particle size is about 0.3a m, so it is called micromicrosilica. it can enter the human alveoli directly through breathing, which is very harmful to human health. at present, china has thousands of silicon iron and industrial silicon electric furnaces. in the production process, the annual production of microsilicais about 250,000 tons. about 50,000 tons can be collected by the environmental protection equipment, and the rest is basically directly discharged into the atmosphere, which not only pollutes the environment but also wastes resources. there is no exact pricing standard for the front-line microsilica, with a price of 1800 ~ 3800 yuan per ton. if the price per ton is calculated as 2,000 yuan, the annual directly discharged microsilica is worth about 500 million yuan as a loss of resource utilization. so the tobacco control must be enforced. collecting microsilicais not only a problem of environmental benefit and social benefit, but also contains great economic benefit and scientific and technological value.

· microsilica concrete is necessary for proper protection. given that there is no protection, the benefits of microsilicato concrete cannot end. it is best not to use microsilicaconcrete on the assumption that the request for appropriate protection is not included in the concrete technical specification and is not implemented in the project.

· it is necessary to pay attention to every step of concrete production and construction when using the concrete with micro-microsilica. the key to concrete function is mixing process and slackness of silica powder. poor mixing and slackness of microsilicamay not have the desired concrete function.

· for determining the 'hard index' function of concrete, choosing compressive strength may be a suitable method. however, the judging function is necessary to be sedate and fully aware of its occasions and conditions. concrete of same strength, check other function parameter, performance is not necessarily same.

· many planar concrete structures have too many surfaces. with a bit of experience in scrubbing, you can get more durable concrete with the least amount of work and avoid plasticity and shortening cracks.

· in the chloride environment, microsilicaconcrete has the desired anti-chloride ion penetration function. so far, some tests on practice structure have proved that the microsilica concrete has excellent functions. meanwhile, a chen said flash: over time, the rate of chlorine penetration is greatly reduced. today, the number of interned microsilicaconcrete structures is now more than satisfactory, and the time of exposure is also long enough to clarify questions. the american microsilica association is working on a project to sample interning bridges, parking buildings and offshore structures.

in addition, the selected materials should satisfy the characteristics of high-speed water flow. to be specific, the protective surface after construction is able to withstand the pulsating pressure of high-speed water flow and the action of high dynamic water pressure. under the long-term action of high-speed water flow, its own stability can be maintained. in particular, when cavitation occurs and a pit is formed, there will be no fracture damage along the crack.