. Grouting material used for filling post-tensioned beam prestressed pipes, preventing corrosion of prestressed steel, and ensuring effective stress transfer between prestressed tendons and concrete structures. , so that the slurry in the channel is full and dense, the slurry maintains a certain value range, and completely wraps the prestressed steel. After hardening, the slurry has high strength and elastic modulus, expansion, non-shrinkage and adhesive force.
. Suitable for filling grouting of post-tensioned beam prestressed pipes, anchor grouting of ground anchor systems, continuous wall head leakage grouting, curtain grouting equipment foundation grouting, pad setting grouting and beam-column joints, engineering emergency repairs and Bolt anchoring, self-compacting without vibrating, micro-expansion, anti-oil penetration, anti-corrosion and anti-corrosion, anti-freeze and anti-permeability. Used for pore grouting of high-strength steel prestressed concrete components, road and bridge reinforcement, ready for operation, and bonded to hardened concrete. The knot is firm, the repair has no obvious traces, and the setting time of the slurry is controllable and moderate.
. Dosage: the amount of cement added to the grouting agent, Prepare the grouting material
. Water consumption of the grouting material: the water-cement ratio used for grouting of prestressed concrete beam pipes shall not be greater than.
. , Construction Equipment
. The speed of the mixer should be greater than /, the maximum linear speed of the blade should be limited to /, and the shape of the blade Should match the rotational speed.
. The grouting machine adopts a continuous grouting pump. The minimum graduation value of the pressure gauge should be less than . The maximum range should ensure that the actual working pressure is within the range of -.
. The storage tank has a stirring function.
. If a vacuum-assisted grouting process is used, the vacuum pump should reach a negative pressure of .
. Measurement: The cement, grouting agent (material), and water should be weighed accurately.
< Technical requirements for mixing technology
. Technical requirements for mixing technology
. Cleaning construction equipment: There should be no residue or accumulated water in the cleaned equipment. The filter space of the blender should be smaller than.
. Slurry mixing operation sequence: first add the actual amount of mixing water to the mixer, start the mixer, add all the pressed slurry evenly, stir while adding, stir after all the powder is added, and finally add the remainder - Mix with water, continue to stir and it is ready to use.
. Fluidity test: Each plate undergoes an on-site fluidity test. After the fluidity meets the requirements, it can enter the storage tank through the filter. The slurry should continue to be stirred in the storage tank to ensure that the slurry body fluidity.
. Under normal circumstances, additional water should not be added to increase fluidity during the construction process.
< Technical requirements for grouting technology
. Technical requirements for grouting technology
. Before grouting, remove debris and accumulated water in the beam channels.
. Before grouting, the grouting pump should be turned on to discharge a small amount of slurry from the grouting nozzle to eliminate air, water and slurry in the grouting pipeline. When the fluidity of the discharged slurry is the same as that in the mixing tank When consistent, you can start pressing into the beam body channel.
. The maximum pressure of grouting should not exceed . The filling degree of grouting should be until the other end of the hole is full and the slurry with the same fluidity as the specified fluidity is discharged from the exhaust hole. After closing the slurry outlet, a stabilization period of no less than 3 seconds should be maintained.
. For continuous beams or when performing pressure grouting, let the water-slurry suspension in the pipe flow freely from the outlet end and pump slurry again until a homogeneous slurry flows out from the outlet end. Maintain this pressure. The process should be repeated - times. After grouting, the density of the grouting should be checked from the anchor plate pressure/grouting hole. If there is any lack of density, additional grouting should be made in time to ensure that the hole is completely dense.
. If the vacuum-assisted grouting process is used, vacuum should be evacuated first before grouting to stabilize the vacuum degree in the channel between ~. After the vacuum degree is stabilized, immediately open the grouting end valve of the pipeline and simultaneously open the The grouting pump performs continuous grouting.
. Grouting sequence: first down and then up. The grouting of the same pipe should be carried out continuously and completed at one time. The time from stirring the slurry to pressing into the beam body should be short.
. Grouting sampling: During the grouting process, 3 sets of standard curing specimens should be made for each hole beam to conduct compressive strength and flexural strength tests, and record the grouting (including: grouting materials, mix ratio , grouting date, mixing time, outlet fluidity, slurry temperature, ambient temperature, holding pressure and time, vacuum degree, on-site grouting person in charge, supervision engineer, etc.).
< Pipeline grouting time limit and technical requirements
. Pipeline grouting time limit and technical requirements
. The final tensioning is complete and pipeline grouting should be carried out inside .
. After grouting, it can be delivered to the warehouse in advance, but it must be ensured that the strength of the standard specimen reaches the specified value.
., beam body, slurry and ambient temperature
. During grouting, the slurry temperature should be between ℃ ~ 3 ℃. Within 3 years of grouting and grouting, the temperature of the beam body and the environment should be greater than ℃, otherwise maintenance measures should be taken. When the construction temperature is higher than 3℃, night or morning and evening construction should be selected. When the temperature is lower than 3℃, it should be handled according to the winter construction technical requirements and the air content index should be increased appropriately.
., Weight: The net weight of each piece of grouting agent (material) is.
., production date and batch number are indicated on the factory certificate.
. Shelf life: Under normal temperature standard storage conditions, the shelf life of the grouting material is one year, and the shelf life of the grouting agent is one year.
. Storage conditions: Store in a cool and dry warehouse, waterproof, moisture-proof, damage-proof, and high temperature (above ℃).
. Transportation conditions: Protect from rain and sun exposure, and keep the packaging intact.
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