Year1
- 包装：
- 牛皮纸袋包装
- 用量：
- 1.8-2.0吨/立方米
- 规格：
- 50kg/袋
Highway bridge prestressed channel grouting agent (referred to as: highway channel grouting material) is a grouting material composed of high-quality cement and a variety of organic and inorganic materials. Add water in a certain proportion at the construction site and mix it evenly before grouting the post-tensioned prestressed tunnels. The product slurry is dense, protecting the prestressed tendons from corrosion and bonding firmly, ensuring the bonding force between the prestressed tendons and concrete, and enabling effective transmission of prestressing force.
It is widely used in the grouting construction of post-tensioned prestressed bridge tunnels, curtain grouting, anchor grouting, gap and cavity filling and repair, etc. Implementation standard "/-"
1. Product advantages
* Low water-to-binder ratio: The water-to-binder ratio is only .~
* High fluidity: The initial fluidity of the slurry after leaving the machine can reach , the fluidity remains within
* High stability: the free bleeding rate of the slurry and the bleeding rate between 3 steel wires are both
* High separation resistance: the product meets the requirements of European Standard 3, normal The test tube has zero bleeding and no defects
* Absolute micro-expansion: The slurry can still expand under the adiabatic conditions in the prestressed channel, which compensates for the shrinkage of the slurry, improves the volume stability of the hardened slurry, and ensures pressure Pulp quality
* Early strength and high strength: compressive strength, compressive strength
* High durability: electric flux, frost resistance level.
2. Product performance indicators
For the main technical parameters of the product of highway bridge prestressed tunnel grout (referred to as bridge grout/tunnel grout), please refer to the main indicator menu below the product picture.
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3. Construction equipment
Pulping machine: The speed of the pulping machine should not be lower than r/the blade linear speed should be ~/.
. Grouting machine: It can perform the above constant pressure operations. The grouting pump should have the function of adjusting the grouting volume and grouting pressure.
The vacuum pump should be able to achieve negative pressure.
4. Pulp making process
Add all the mixing water to the mixer first
Start the mixer and rotate at low speed
Evenly add all the slurrying materials
Stir normally< br/>, while stirring, enter the storage tank through the filter.
5. Grouting process
Before the slurry fluid enters the beam body channel, the grouting pump should be turned on first to discharge a small amount of slurry from the grouting nozzle to eliminate air, water and air in the grouting pipeline. Slurry.
When grouting, the curved channels and vertical channels should be grouted from the grouting hole at the lowest point into the channels arranged in upper and lower layers in the structure or component, and grouting should be carried out in the order of the lower layer first and then the upper layer. Grouting in the same tunnel should be carried out continuously and completed at one time. Grouting should be carried out slowly and evenly without interruption, and all exhaust holes at the highest points should be opened and closed in sequence to ensure smooth exhaust in the channels.
The duration from when the slurry is mixed to when it is pressed into the tunnel should not exceed. The slurry should be continuously stirred before use and during the pressure injection process. For cement slurries with reduced fluidity due to delayed use, additional water must not be added to increase the fluidity and must be discarded.
For horizontal or curved holes, the grouting pressure should be .~. For extra-long holes, the maximum pressure should not exceed. For vertical holes, the grouting pressure should be .3~.
The filling degree of the grouting should be until the other end of the tunnel is full and the vent hole discharges cement slurry with the same fluidity as the specified fluidity. After closing the slurry outlet, a stable pressure period of not less than . The holding time of the pressing period should be 3~. The channel grouting of multi-span continuous prestressed tendons connected by connectors should be carried out immediately after the prestressed tendons of the connector sections are tensioned, and continuous grouting should not be done after all sections have been tensioned.
The vertical channel grouting should be carried out from bottom to top, and valves should be installed to prevent the backflow of cement slurry.
. Vacuum-assisted grouting. When grouting the tunnel, first close the grouting valve and exhaust valve at the grouting end. Start the vacuum pump at the slurry discharge end to make the vacuum degree of the hole reach ~ and remain stable. Then start the grouting pump to start grouting. During the grouting process, the vacuum pump should keep working continuously. When there is slurry passing through the vacuum end, close the valve leading to the vacuum pump. At the same time, open the slurry discharge valve located above the slurry discharge end, discharge a small amount of slurry and then close it. Grouting work continues to be completed by conventional methods.
6. Precautions
After the final sheet is completed, the hole grouting should be carried out as soon as possible, generally not more than 10 seconds.
When grouting, the slurry temperature should be between ℃ and 3℃. During and after grouting, the temperature of the beam body and the environment must not be lower than ℃. Otherwise, maintenance measures should be taken and the winter construction procedures should be followed. If treatment is required, an appropriate amount of air-entraining agent can be added to the slurry, but antifreeze must not be added. When the ambient temperature is higher than 3°C, grouting should be carried out at night.
7. Product packaging and storage
* When storing the slurry, it should be protected against water, moisture, damage and high temperature.
* Storage period If the above conditions are met, the storage period of pressure slurry is 3 months. If the storage period exceeds, it can still be used after passing the inspection.
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