Datong grouting material - grouting material of freeze-thaw damage 
 Grouting material hydration harden within a lot of pores in the pouring of the grout material, the more necessary workability often than the hydration of the cement required for the water, excess water retention in the grouting material capillary hole, the low temperature water resulting from ice volume expansion caused by the grouting material, the internal structure of the Cosmos grouting material damage. Repeated freezing and thawing several times, it will make the grout damage accumulation reaches a certain level and cause structural damage. 
 Grouting material to the most salient features of the freeze-thaw damage in surface spalling, severe cases can reveal stones. Grout, the frost resistance of Datong grouting material and grouting material within the pore structure and the bubble content of the number of closely related, the hole is more less the smaller the smaller the damaging effects; more closed bubble, anti-freeze type, the better. Affect the grout, Datong grouting material of frost resistance factor, in addition to the pore structure and gas content also includes: the saturation of the grouting material, water-cement ratio, the age of the grouting material, aggregate porosity and during the moisture content and so on. 
 Grouting material the Datong grouting material antifreeze security factors at home and abroad have carried out a large number of experimental studies, mainly marriage is: the main measures to prevent freeze-thaw damage grouting material is lower water-cement ratio, to reduce the grouting compound excess of water. Winter construction, to enhance the conservation, to prevent early frost, and mixed with antifreeze. A variety of grouting material in raw materials, additives, antifreeze type the greatest impact (antifreeze type of grout mixed with air entraining agent significantly improved), followed by varieties of cement (cement antifreeze mixed with more admixture poor. the impact of anti-freeze type) mineral admixture is generally believed that silica fume 5% to 10% fly ash content of 15% antifreeze type of grouting material can be improved, but when the content exceeds a certain range, frost-type by impact. 
 Datong grouting material construction should meet the following requirements: 
 1, the slurry from the side of poured, until the other side of the overflow, in order to facilitate the discharge of air between the device docking station and concrete foundation, so that the grout, not from the four sides of the grouting. 
 After the start of the grouting must be continuous, without interruption, and should be as short as possible filling time. 
 3, in the grouting process should not be vibrated, available bamboo strips, if necessary, pull the diversion. 
 4, each time filling layer thickness should not exceed 100mm. 
 5, longer equipment or track-based grout should be used in the segmented construction. Each length of 10m is appropriate. 
 The filling process is found that the surface phenomenon of bleeding a small amount of the CGM dry material, can dispenser, sucking up water. 
 7, when the grout layer thickness is greater than 1000mm large footprint of foundation grouting, mixing the grout material, the total ratio of 1:1 by adding 0.5mm stones, but are subject to testing to determine its groutability can meet the requirements. 
 8, device foundation grouting is completed, to eliminate the part before the final setting of the grout layer for processing. 
 9, the grouting process until the mold release before grout layer should be avoided by the vibration and impact, to avoid damage to open the hard layer of grout. 
 10, the horizontal distance of the template and the equipment chassis should be controlled at about 100mm, in order to facilitate grouting. 
 11, filling run slurry phenomenon appears, should be promptly dealt. 
 12, when the equipment foundation grouting a large amount of mechanical mixing method, in order to guarantee the construction of grouting. 
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