Xinzhou grouting material - finely ground blast furnace slag grouting material 
 Silicate slag cement has been used for more than a century, although in recent years, gradually began to Portland cement and ground blast furnace slag added directly to the grouting material mixing machine mix. The advantages of this approach is that you can arbitrarily adjust the proportion of Portland cement and ground slag; drawback is the need to add a silo. 
 Slag and pig iron production obtained control of the production process can guarantee that the volatility of these two materials are small. Then to slag grinding or crushing; the sake of simplicity, usually on the use of the term "finely ground". Ground slag grinding to any desired degree of fineness, but usually greater than 350 m / kg of ground slag. 
 Ground slag incorporation mixture has the following advantages: You can improve the fresh grouting material, Xinzhou grout; slow down the hydration heat release rate, reducing the maximum temperature rise; improve the hardening slurry density, improve long-term strength of the grout, especially durability; regardless of the level of portland cement alkali content or the aggregate activity of size, can eliminate the alkali - silicate reaction risk. 
 The fineness of the ground slag, the total mass of the cementitious material content, depending on its use in grouting compound. 
 The ground slag fresh grout, the Xinzhou grouting material properties of 
 Can improve the incorporation of ground slag mixture workability, increased fluidity and cohesiveness. This is because such a gelling material particles are more dispersed, and the results of the surface characteristics of the role of ground slag, slag particles a smooth surface and less absorbent in the mix. However, compared with the grouting material containing Portland cement increased sensitivity of the doped ground slag grouting material right amount of water changes. When slag grinding to a higher degree of fineness, ground slag can reduce the bleeding of the grout. 
 Some studies have reported that early slump of the doped ground slag mixture, there will be losses, but also has been reported that the smaller rate of slump loss. 
 At room temperature, the mixture mixed with ground slag retarding, often retarding about 30 ~ 60min. Ground slag grouting material, Xinzhou hydration and strength development of grout 
 Compared with only portland cement, lime content less after the mixing of portland cement and ground slag, a higher silicon content, so the composite cement formation of CSH more, hydroxide, calcium less. Thus lead to the microstructure of hardened cement slurry is more dense. However, ground slag initial hydration and its slow, because it depends on the glass phase Portland cement hydration release of the speed out of the OH ions dissolved. Similar doped pozzolanic activity of materials, composite cement, ground slag will react with Ca (OH) 2. 
 Ground slag gradual release of alkali, Portland cement is calcium hydroxide, resulting in the reaction of ground slag will continue for a long period of time. Therefore, the intensity will show a long-term growth trend. For example, Roy quoted, hydration, after the 3d age of 85 to 16% ground slag hydration, 28d degree of hydration of 30% to 37%. Doped ground slag to accelerate post-hydration rate of the composite cement. Therefore, in general, mixed with ground slag will reduce the grouting material produced by the hydration of cement the Xinzhou grouting material temperature. 
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