Preparation of CGM high-strength non-shrinkage grouting material should be pay attention to

Preparation of CGM high-strength non-shrinkage grouting material preparation CGM high-strength non-shrinkage grouting material manufacturers make CGM high-strength non-shrinkage grouting material CGM high-strength non-shrinkage grouting material for discussion at present stage, the domestic has been emphasized to use high strength grade yingkou equipment foundation grouting cement, the strength of not less than 42. 5 strength grade, some even mistaken for necessary use 52. 5 strength grade, and 62. Abilities to make high strength grouting material strength grade 5. In fact, we use different strength grade of cement to make CGM high-strength non-shrinkage grouting material, is for the purpose of giving full play to the advantages of low strength grade of cement, mainly has the following reasons: the front, because of the high strength grade cement and special cement prices high, must be level affects the high strength without shortening wuhu extension and application of grouting materials manufacturer grouting materials. Second, some high strength grade cement often choose produce fine grinding process, cement specific surface area is greatly increased, resulting in the early stage of the grouting material craze, and plus the adaptability between the seam an agent, brought a series of problems to engineering application. Third, considering the low strength grade of cement specific surface area is lesser, of about 300 ㎡ the hydration heat release rate is relatively low, is advantageous to the CGM high-strength non-shrinkage grouting material of temperature control, reduce early temperature of stress cracks.