Huangshan, Jining grouting material - vacuum dewatering grouting material 
 Vacuum dehydration of the grouting material to solve a well-established sufficiently high workability and minimum water-cement ratio. 
 Production process is briefly described as follows: mixture of medium workability ordinary casting template. Fresh grouting material contains a continuous water-filled micro-tube system, vacuum approach to grouting materials, the Huangshan grouting materials, the Jining grouting material surface can make a lot of water drawn from a certain depth of the grouting material. In other words, the water is no longer needed, referred to as the "working water" is discharged out. It should be noted that only the surface layer of bubbles can be removed, because the bubbles do not form a continuous system. 
 Thus lowering the final water-cement ratio prior to the condensation of the grouting material, and controlled in large part because the ratio of the intensity of vacuum dehydration grouting material than other methods to control the grouting material obtained has a higher strength, higher performance density, penetration low and high wear resistance. Part of the water extracted, however, remain in the pores, the kind of purely theoretical advantages of the water discharged is virtually impossible to achieve, reaches a critical value, intensity will not significantly increase, and thus the long vacuum processing is not necessary. The critical value depends on the thickness of the grouting material and the mixture with the ratio. Nevertheless, after the vacuum dehydration of the grouting material, Huangshan grouting material strength is largely determined by the final water-cement ratio. 
 The vacuum is formed through the porous mesh to connect the vacuum pump. The network overlay layer is covered by a muslin fine wire mesh, play to prevent the cement with water to exclude the role. The mesh can be placed immediately after the grouting material is just leveling it can advance placed on the template surface. 
 The vacuum is a vacuum pump rely on: his ability by the mesh surrounding, but not its area of ??control. Vacuum weight size is usually about 0.08MPa. Vacuum role in bringing the content of reducing up to 20%. The closer the mesh, the greater the reduction of water; thus often assume that the pumping action of the effective depth 100 ~ 150mm. Water discharge generated by the concrete settlement of about 3 percent of the thickness of the vacuum extraction. Reduce the exclusion of water depth with time, has been found for 15 ~ 25min job is usually the most economical. 30min after the reduction of water content is not more. 
 Strictly speaking, does not occur during the vacuum treatment absorbent phenomenon, but only the pressure drop below atmospheric pressure to spread the fresh grouting material, Huangshan grouting materials, the Jining grouting material gap liquid. This means that taking place in the atmospheric pressure compacting role. Remove the amount of water equal to the grouting material the total volume of the amount of compression, and thus the filling material will not porous. But, in fact, but the formation of some porosity, for the same final water-cement ratio, ordinary grout strength than the vacuum dewatering grouting material, Huangshan grouting material is slightly higher. 
 If the vacuum dehydration during intermittent vibration, can prevent the formation of pores; In this case, you can get a higher density, and sucked out of the water may be about twice as large. Garnet test, vacuum dehydration 20min, and 4 ~ 8min vibration after 14 ~ 18min again vibration, you can get good results. 
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