High-strength non-shrinkage grouting material in the aggregate of importance

Due to the aggregate accounts for 3/4 of the grouting material volume so far, there is no doubt that the quality of the aggregate is quite important for high-strength non-shrinkage grouting material. Aggregates can not only restrict the strength of the grouting material, for example, does not conform to the requirements of aggregate cannot be used to produce has enough strength of grouting material, and the aggregate also greatly affects the properties of grouting material and structure of the durability of the performance. People consider aggregate is an inert material, mainly for the purpose of economy, make the full distribution of filling in the slurry, but on the other hand, also aggregate can be thought of as a kind of building materials, with the aid of cement bond into a cohesive whole, as used in masonry construction. In fact, the aggregate is not really lazy, its physical properties, learned that performance and chemical performance will affect the performance of high-strength non-shrinkage grouting material. Aggregate is much cheaper than cement, so in high-strength non-shrink grout material mixture, multi-purpose aggregate and use less as far as possible the cement is the economy. But the economy is not practical reason of aggregate, it also caused a lot of the technical advantages of grouting materials, such as the volume of a single cement slurry is higher than that in its stability and better durability. The aggregate used for grouting material, and the section size range from a few millimeters until around 1/10 of a millimeter. Although in fact the size of aggregate used is different, but all have a variety of particle size, the particle size distribution as grading. In the preparation of low grade grouting material, sometimes use aggregate from the yard, it contains various sizes of particles, can be called gradeless and uniformly priced goods aggregate or screening aggregate. When preparation quality high-strength non-shrink grout material, usually takes at least two groups have different size particles consisting of aggregate, fine aggregate and coarse aggregate. Lower limit of natural sand particle size slightly smaller, usually about 10 um or 60 um. The particle size 2 - 62 um material between silt, smaller particles of clay. Loam is a kind of soft sediments, have roughly the same proportion of sand, silt and clay. Although the particle content of less than 75 um often report, but silt and clay effect on the properties of grouting material usually have a lot of difference, because the particles size and composition are different. All of the natural aggregate particles after weathering and erosion of natural process or of choose and employ persons for method can make its broken into pieces. As a result, many properties of aggregate depends entirely on the nature of the original rock, and chemical and mineral composition and lithofacies characteristics, relative density, hardness, strength, pore structure and physical and chemical stability, color, etc. But on the other hand, aggregate also has the nature of some of the original rock have no, particle shape and size, surface structure and absorbent. All of these properties for the new mix grouting and hardening grout material quality will have a significant impact. To add appropriate, however, although these different properties of aggregate can be check out, but to give high quality aggregate under a definition or difficult, can only say that with this kind of aggregate can make the high quality high strength non-shrinkage grouting material. Various performance are satisfactory aggregate can always with high-quality high-strength non-shrinkage grouting material. But otherwise not so much, that is why want to use the performance of the grouting material standard. In particular, has been found that certain aggregate in some aspect of performance may not be satisfactory, but when it is used for grouting material and what problems did not happen.