Roads and bridges prestressed duct grouting agent DJ-G highway bridge prestressed pore-pressure slurry water reducing agent is, swelling, Plasticity, enhancement, anti-segregation, a variety of mineral admixtures and other component materials made of mixed dry mix material. At the construction site by mixing cement, water, stir after duct grouting for post-tensioned. Customers choose grouting agents, the company will test with customers compatibility with cement to meet the technical requirements of the construction. A certain amount of adaptation bridge prestressed duct grouting agent is mixed with cement homogeneous slurry as a bridge prestressed pore pressure, and its performance parameters, see DJ-01 highway bridge prestressed pore pressure slurry instructions. A highway bridge prestressed pore pressure ratio of slurry Advantages ??? after low water-cement ratio: water-cement ratio of only 0.26 to 0.28; ??? high liquidity: the machine up to the initial flow of the slurry 10S, fluidity after 60min remained within 25S; ??? high stability: 24h paste between freedom 3h bleeding rate and wire bleeding rates were 0; ??? high resistance to separation: products meet European standards ETAG013 requirements, simulation test tube 5m zero bleeding, no defects; ??? absolutely wet micro-expansion: the slurry in the Prestressed wet conditions must still produce swelling, shrinkage compensated paste, improved volume stability of hardened paste ensure grouting quality; ??? early strength of high-strength: 3d compressive ≥20MPa, 28d compressive strength ≥50MPa; ??? high durability: 28d electric flux ≤1000C, 28d antifreeze grade ≥F500. Second, the material before the test with grouting pipes, should advance to the pressure of the slurry used in a trial match. Cement, superplasticizer, weighing micro expanders, mineral admixture, water and other materials should be accurate to ± 1% (are mass). Water-cement ratio should not be more than 0.33. The test card test, slurry performance quality indicators are met before using the above technical parameters requirements. Third, the construction equipment and a weighing accuracy, construction equipment mixer speed is not less than 1000r / min, maximum line speed limit paddle within 15m / s. The shape of the blades should be matched with the speed, and to meet stirred uniformly within a predetermined time requirements. Grouting machine with continuous pump. Its pressure gauge minimum scale value should not exceed 0.1MPa, the maximum range should make the actual operating pressure within 25% -75% of the range. Storage tank shall be provided with mixing function. Such as the use of vacuum assisted grouting process, vacuum pump should be able to reach a negative pressure 0.092MPa. 2, weighing accuracy in formulating the slurry mixes, cement, syrup-pressure, water was weighed to an accuracy of ± 1% (are by mass). Measuring instruments should be qualified by the legal metrology, and used in the period. Fourth, the mixing process 1, before mixing, construction equipment should be cleaned. There should be no residue, water, and check the mixer filter inside the equipment after cleaning. When pressed by the mixer into the slurry storage tank, should go through the filter, the filter should not exceed the space 3mm × 3mm. 2, the slurry was stirred sequence of operations as follows: First, in a mixer was added 80% -90% of the actual amount mixing water, start mixer, a uniform addition of all pressure-syrup, added with stirring, and then evenly added to all the cement. All powder was added followed by stirring for 2min; then add the remaining 10% -20% of the mixing water, stirring was continued for 2min. 3. Stir, carried out on-site machine fluidity test conducted once every 10 to detect its fluidity within the scope of the above provisions of the main technical parameters, you can filter through into the storage tank. Should continue stirring the slurry in the reservoir tank in order to ensure the fluidity of the slurry. Should not be in the construction process due to insufficient flow of extra water. V. Groutig 1, before grouting, the beam should be cleared of debris and water within the pore. 2, the slurry pressed into the beam before the channel, you should first open the pressure pump, squeezing the slurry discharged from the mouth a little, in order to exclude grouting pipe air, water and slurry. When discharged slurry fluidity and stirred tank consistent fluidity before the start push beam channels. 3, the maximum pressure grouting should not exceed 0.6MPa. Grouting fullness should reach full bore and the other end to exhaust vent with the provisions of the fluidity of the same date paste. After the pulp mouth shut, keep no less than 0.5MPa and not less than 3 min of regulation period. 4, for a continuous beam or plasma pressure up and let the water in the pipeline - the pulp suspension flowing freely from the outlet end. Slurry pump again until a homogeneous slurry outlet end outflow, packing 5min under the pressure of 0.5MPa. This process should be repeated 1-2 times. 5, pressure grouting should anchor plate / a dense plasma conditions grouting hole inspection and, if not real, should be supplementary irrigation to ensure the channel is completely dense. 6. If you use a vacuum-assisted grouting process before grouting should first evacuated to a vacuum degree of stability within the pore between -0.06MPa ~ -0.08MPa. Stable vacuum degree, should immediately open pipe grouting end valves open simultaneously continuous pressure grouting pump. 7, grouting order before you get on the same pipeline grouting should be continuous, once completed. From the slurry was stirred to the press beam time should not exceed 40 min. 8, grouting process, should make every hole Liang Group 3 standard curing specimens (40mm × 40mm × 160mm), compressive strength and flexural strength tests. Grouting and recorded. Recording projects should include: grouting materials, mix, grouting date, mixing time, the machine fluidity, slurry temperature, ambient temperature, pressure and dwell time (vacuum), grouting site person in charge, supervising engineer and so on. Six construction precautions when slurry grouting temperature should be between 5 ℃ ~ 30 ℃, after grouting and grouting within 3d, beam and ambient temperature should not fall below 5 ℃, otherwise conservation measures should be taken to meet Claim. When the ambient temperature is above 35 ℃, should choose a lower temperature time of construction, such as at night. When the ambient temperature is below 5 ℃, should winter construction process may be appropriate to increase air-entraining agents, gas content determined by tests. Antifreeze should not be used in grouting agent. Seven, product packaging and storage? Grouting agent package should be sealed from moisture. ? The product should be stored in a dry, ventilated, shady places. ? Storage period in compliance with the above conditions, the pressure-syrup storage period of 12 months, such as more than storage period can still be used after passing inspection.