Hengshui grouting material - high-performance grout durability 
 Is one of the main features of high performance grouting material with low permeability, it received a great deal of concern. 
 Hydration of high-performance grout slurry structure is very dense (in fact, this is also part of the high-performance), the capillary porosity non-continuous means that the high-performance grout, the Hengshui grouting material has good resistance to external erosion. This is especially true in the grouting material resistance to chloride ion penetration. For example, the similar trials with ASTMC1202-94, to test the core samples taken from the 120Mpa the grouting material cylinder, found no chloride ion penetration phenomenon. Even if the grout water-cement ratio of 0.22 and exposed to 105 ° C environment, drying, evaporation of water to remove hardened grout, then exposed to chloride ion penetration and found that the chloride ion penetration is still very low. 
 As for the alkali - aggregate reaction, due to the high-performance grout, of Hengshui grouting material permeability is very low (which can limit the ion migration) and the amount of water rarely, and thus can be predicted to silica fume, high-performance concrete can inhibit alkali - aggregate reaction. Should keep in mind the presence of water, a necessary condition of the alkali - aggregate reaction. 28d strength is greater than 80mpa grouting material, the internal relative humidity is very small. This will reduce the likelihood of alkali - silica reaction. Fact, has been traced to the 1994 literature, no reports of the high-performance concrete alkali - silica reaction, alkali - silica reaction resulting from the use of impact should also considerable period of time in order to show up. 
 High performance grouting materials, the Hengshui grouting material, the frost durability, you should consider the following aspects. First of all, water can freeze in the structure of the hardened grout rarely. Secondly, the air-entraining strength of high performance grouting material, this is because the air-entraining improve efficient water reducing effect, but can not be completely complementary. In addition, under the conditions of very low water-cement ratio, air-entraining very difficult. Therefore, the best way is to determine a maximum water-cement ratio lower than this value, repeated freeze-thaw cycle does not damage the grouting material. 
 In addition, there are some other factors also affect the grouting material durability, including cement properties, the grouting material is exposed to freeze-thaw cycle before the conservation effect. Studies have shown that the above-mentioned water-cement ratio limit of 0.25 or 0.30, and can not be considered water-cement ratio below the limit of the grouting material must have frost durability. On the contrary, when the gas - hole spacing parameter is greater than the ordinary grouting material, but also may be able to effectively prevent the grouting material is freeze-thaw damage, but there is no reliable test data. If the poor maintenance of grouting material and the subsequent drying, the grouting material, the the Hengshui grouting material surface area may be more weak, resulting in the grouting material resistance to deicing salt peeling erosion performance is more difficult to determine. 
 Is worth noting that, if the choice of a mixture requires high strength within a few hours (possibly subsequently put into use, the service environment may include exposure to freeze-thaw conditions), even if the water-cement ratio is low, you must also incorporation cited the gas agent. The reason is that conservation is not sufficient, the capillary pore water may freeze. 
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