What are the factors affecting the durability of grouting material effect? - Xining grouting material

grouting CGM grout CGM grout material manufacturer grouting material building in use process long time by environmental temperature, humidity and atmospheric effects such as precipitation, frozen, and the contact effect of harmful chemicals in soil, water and air, the corrosive medium will with grouting material in Ca (generated by hydration of cement 哦) 2, crystal and natural gas hydrates C3A attack corrosion grouting material, gradually make grouting material damage, the grouting material in the steel bar corrosion, impact its using life.     After grouting guess mixed with mineral fine admixture, on the one hand, because the cement dosage, cuts would be cut by the corrosion of the internal elements; Mineral fine admixture, on the other hand, the fine particles and hydration products of filling water bearing grouting material composition is non-selective pore, improve the grouting hole structure, reduced the permeability of grouting material, to prevent the invasion of the corrosive medium. Thus, adding mineral fine admixture can advance grouting the durability of the material.       After the other, adding mineral fine admixture, because cement clinker cut accordingly, total quantity of heat of cement hydration will be cut, and then can lower the rise of temperature of the grouting material, cutting temperature cracks. However, incorporation of silica fume is not fall in temperature rise and that wen can slightly early, instead it is because ultrafine silica fume in guess response soon formed by cement grouting. When specific surface area of the ground granulated slag is too large, also can have the effect, therefore, superfine slag powder is bad for grouting material temperature drop, and since the shorten with the increase of specific surface area, drying shrinkage is big also, cracking sensitivity is bigger. To need to strictly control the temperature rise and strength requirements of the project, can speak silicon ash, ground granulated slag is highly active fine admixture with compound such as fine grinding fly ash, lime stone powder are used.             The durability of superfine powder of grouting material effect can be summarized into two aspects;             1, prevent grouting material alkali - Aggregate disease & # 8195;           When grouting guess alkali content more than 3 kg/m3, aggregate and alkali active cases, the base grouting material is easy to attack - Aggregate reaction, such as with a moisture effect, will swell, forming grouting material craze damage, or destruction.             In general, the grouting time mixed with 30% fly ash, slag, 40% and 20% ~ 25% of the natural zeolite powder, 15% ~ 20% of partial old earth superfine powder or 10% of silicon powder, can usefully be resisted the alkali - The harmful swell of aggregate reaction.       Concrete secondary grouting material;     2, grouting material salt injury, cold injury against the corrosion & # 8195;           Durability diseases have generally the degradation effect of external force, such as temperature, humidity and the effect of carbide, all of the grouting and reinforced grouting material structure, will suffer from this kind of degradation is the effect of external force, the other is a special the degradation effect of external force, such as salt, cold salty soil corrosion, etc. , it's demand according to the environmental conditions of the structure is located. For example, a coastal city, salt pollution most serious; The cold is more prominent in the northeast and northwest. Winter deicing salt, also can bring salt injury.             Grouting and reinforced grouting material structure, corrosion resistance durability disease, besides considering the degradation effect, but also special degradation effect of external force, the grouting time mixed with mineral quality superfine powder is a useful technique way of disease resistance durability.