Highway Bridges prestressed duct pressure slurry

Highway Bridges prestressed prestressed pipe hole pressure slurry pressure slurry highway Bridges prestressed hole size ( Hereinafter referred to as: highway tunnel pressure slurry/highway pipeline pressure slurry) Based on high quality cement and various organic and inorganic materials of composite grouting material. In the construction site according to certain proportion and water, and stir well, used for post-tensioned prestressed duct grouting. Product slurry is close-grained, protection of the prestressed steel from corrosion; Binding and firm, ensure the cohesive force between the prestressed reinforcement and concrete, prestressed transfer. Widely used in bridge method of post-tensioned prestressed duct grouting construction, curtain grouting, anchor grouting, void, empty fill repair, and other fields. Execution standard 'JT/t946 - 2014 'a *, product advantages to low water/cement ratio, water/cement ratio is only 0. 26 ~ 0. 28; * high liquidity: slurry of the initial fluidity machine can reach 10 s, fluidity after 60 min remain within 25 s; 24 h * high stability: slurry free exudation rate and 3 h steel wire between exudation rate to zero; * high separability: products meet European standards ETAG013 requirements, simulation test 5 m zero exudation and zero defect; * unique micro expansion: wet slurry under the condition of prestressed pore off wet can still produce inflation, compensation slurry shrinkage, enhance the volume stability of hardened cement paste, ensure the quality of grouting; * early strength, high strength: 3 d = 20 mpa, the compressive strength of 28 d compressive strength = 50 mpa; * high durability: electric flux 28 d = 1000 c, 28 d = F500 antifreeze level. Second, the product performance index of highway bridge prestressed duct pressure slurry ( Bridge pressure slurry/channel size) Product main technical parameters see a larger version of the 'leading indicators' menu below. 1, construction equipment and pulping machine: pulping machine speed is not lower than 1000 r/min. Blade linear velocity should be 10 to 20 m/s. 2, grouting machine: 0 can be performed. More than 5 mpa constant voltage operation, should have grouting amount, grouting pump into the slurry pressure adjustable function. 3, vacuum pump should be able to reach zero. 1 mpa pressure. Third, pulping process 1, mixing blender to join all water consumption; 2, to start the mixer, low-speed rotation; 3, uniform to join all pressure slurry; Stir 2-4 and smoothly 3分钟; 5, stirring edge through filter into the storage tank. 4, 1, grout pressure grouting technology in the beam body channel before, should first open grouting pump, slurry from grouting mouth out a little, to eliminate grouting pipe in the air, water and slurry. 2, grouting, should from the lowest to the vertical curve concreted complete hole grouting hole to enter; Above a layered set of structure or component of channel, should press the lower before the upper sequence of grouting. The same hole grouting should be continuous, at one time. Grouting shall be carried out slowly and evenly, without interruption, and all should be the highest point of the vent opening and closing, make pore exhaust flow. 3, slurry mixing to the continuation of pressure into the channel time should not be more than 40 min. Slurry before use and injection process should be continuous stirring, caused by delay used for lowering the degree of cement slurry, not through additional add water to increase its fluidity, and must be discarded. 4, to the level or curve tunnel, grouting pressure should be 0. 5 to 0. 7MPa； For super long tunnel, the maximum pressure should not be more than 1. 0MPa； For vertical channel, grouting pressure should be 0. 3 to 0. 4MPa。 5, grouting filling degree should reach the hole and the other end of the full vent discharge the same as the regulations on fluidity of cement slurry, pulp out close mouth, should maintain a is not less than 0. 5 mpa voltage phase, the phase voltage keep the appropriate time for 3 ~ 5 min. Adopt the connector to connect multiple span continuous prestressed duct grouting, should be immediately after the tensioning prestressed reinforcement of connector section, shall not be in each subsection all tension after a continuous grouting. 6, vertical hole grouting shall be carried out from bottom to top, and the valve should be set up, prevent water mud reflux. 7, vacuum aided grouting, the duct grouting, the grouting end to grouting valve, exhaust valve closed. At the row of pulp end start the vacuum pump, vacuum to make hole - 0. 08 - - 0. 1 mpa and remained stable. Then start to grouting grouting pump. In the process of grouting, the vacuum pump should keep continuous working, for vacuum side has serous passes close to the vacuum pump valve, open at the same time in line at the top of the row of pulp slurry end valves, a little slurry closed after discharge. Grouting work finished continue according to the conventional method. Five, note 1, zhang, as soon as possible for the duct grouting, generally not more than 24 h. 2, grouting slurry temperature should be between 5 ℃ ~ 30 ℃, grouting process and grouting, within 48 h after beam body and the ambient temperature shall be not less than 5 ℃, otherwise the curing measures should be taken, and handle according to the requirement of the winter construction, can use a moderate amount of mixing air-entraining beauty in serous seam an agent, but shall not be mixed with antifreeze beautiful seam an agent. When the environment temperature above 35 ℃, grouting should be in the night. Six, product packaging and storage of * stock storage pressure, waterproof, moistureproof, prevent breakage, anti high temperature. * storage period under the accords with afore-mentioned conditions, 圧 stock storage period for 3 months, such as more than storage period after inspection qualified can still use.