Hebei, Shanxi and grouting material - high performance grouting material aggregate characteristics 
 Although ordinary aggregate can be used for the preparation of high performance grouting material, But when the grouting material of high strength, coarse aggregate strength is also very important. Therefore, the intensity of the parent rocks is very important, but the bond strength between the aggregate particles may also be constraints. Studies have shown that the mineral composition of the coarse aggregate will affect the strength of the grout, but not what Layman's Guide to the aggregate selection. 
 Required for long-term strength of the grouting material, Hebei grout, you need to use the aggregate strength specification, if the requirements of high performance grouting material is very long with high intensity (such as 2d when 40mpa) but do not require long-term strength, the strength of the aggregate particles is not so important. 
 But generally require the use of high-quality aggregate. In order to ensure a strong bond between aggregate and matrix, aggregate particles should be uniform in size. To remember the broken aggregate particle shape not only with the parent rock type and bedrock, with the crushing method, impact crusher usually produce long or flake aggregate. On the shape, gravel, can be used for the preparation of high performance grouting material, but if the aggregate surface is very smooth, the aggregate - aggregate bond is not strong enough. 
 Be sure to keep aggregate clean, no dust and broken evenly, grouting material, Hebei grouting material, Shanxi grouting material is likely to be exposed to freezing and thawing conditions, the durability of coarse aggregate particles is essential. 
 Fine aggregate particles should be round and level with uniform, relatively coarse, high performance grouting compound rich mixture of fine particles with higher levels; usually recommended fine aggregate fineness modulus of 2.8 to 3.2 However, based on high performance grouting material used in the aggregate range of view, experience tells us, fine aggregate and coarse aggregate are limited to a small geographical area and therefore can not be summarized overall. 
 Solid particles system also would like to add. Selection of the coarse aggregate, the large particles aggregate undesirable, because it will result in the interface zone in the non-homogeneous phenomenon, aggregate with the surrounding hydration water slurry, elastic modulus, Poisson's ratio, shrinkage, creep and thermal properties inconsistent. Equivalent to the maximum particle size less than 10mm or 12mm aggregate, inconsistent performance has resulted in the emergence of micro-cracks. Reduce the maximum particle size of the aggregate will lead to increased water demand, however, take into account the superplasticizer dosage higher, so the mixture of water consumption is still low. 
 The aggregate of the maximum particle size decreases, the total surface area increases, means that the bond stress between the aggregate decreases, so there is no bond failure. Thus, in the compression tests, there will be destruction throughout the coarse aggregate, or hardening of the cement slurry. High performance grout, Hebei grouting materials, the Shanxi grouting material, the flexural test, can also be observed cracks throughout the development process of the coarse aggregate. This means that the bond strength of not less than the tensile strength of the aggregate. 
 The elastic modulus of coarse aggregate on the strength of high performance grouting material is not yet clear, but the low elastic modulus of aggregate (aggregate modulus of elasticity and hardening grout or less) will result in with the cement paste bond stress lower argument (due to the integrity of the grout) is debatable. This is favorable for high performance grout, the Hebei grouting material. 
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