Pre stressed groutProduct Technical Specifications
After the prestressed reinforcement is tensioned and anchored, the duct should be grouted as soon as possible, and it should be done before48hCompleted internally. In response to this grouting demand, the prestressed pipeline grouting material has superior performance. It has the characteristics of good fluidity, no bleeding or layering, good durability, no rusting of prestressed steel bars, firm bonding with concrete, full and early strength of grouting, slight expansion and high filling, and can be used for one-time grouting construction. The grout inside the pipeline is dense and has no gaps. The product is easy to use and can be directly added with water,executeDesign Specification for Highway Reinforced Concrete and Prestressed Concrete Bridges and CulvertsJTG3362-2018Standard requirements.
1Main performance：
item eye | performance metrics | Test results | |
Water cement ratio（%) | 0.26～0.28 | 0.27 | |
Condensation time（h） | initial setting | ≥5 | 8:30 |
Final coagulation | ≤24 | 11:30 | |
Liquidity（25℃）（s） | Initial liquidity | 10～17 | 15.2 |
30minfluidity | 10～20 | 19.1 | |
60minfluidity | 10～25 | 24 | |
Bleeding rate（%） | 24hFree bleeding rate | 0 | 0 |
3hInterlining rate of steel wire | 0 | 0 | |
Pressure bleeding rate（%） | 0.22MPa (Vertical height of the duct ≤1.8mWhen) | ≤2.0 | 1.0 |
0.36MPa (The vertical height of the duct is greater than1.8mWhen) | |||
Free expansion rate（%） | 3h | 0～2 | 0.3 |
24h | 0～3 | 1.1 | |
Filling degree | qualified | qualified | |
Compressive strength（MPa） | 3d | ≥20 | 29 |
7d | ≥40 | 45 | |
28d | ≥50 | 60 | |
Flexural strength（MPa） | 3d | ≥5 | 5.5 |
7d | ≥6 | 8 | |
28d | ≥10 | 12 | |
Corrosion effect on steel bars | rust-free | rust-free | |
execution standardDesign Specification for Highway Reinforced Concrete and Prestressed Concrete Bridges and CulvertsJTG3362-2018
IIMain Features：
1Good liquidity, high strength, no bleeding, no layering.
2Good durability, no aging, no corrosion to steel bars, durable and sturdy.
3Grouting has characteristics such as fullness, early strength, and slight expansion.
4The product has high filling capacity and can be used for one-time grouting construction. The slurry inside the pipeline is dense and has no gaps.
5The prestressed steel bars are not corroded and are firmly bonded to the concrete.
6Easy to use, simply add water to use.
IIIScope of Application：
Suitable for grouting operations of cement slurry, cement mortar, and cement concrete, especially suitable for post tensioned prestressed hole grouting construction of large projects such as ordinary highways, expressways, high-speed railways, bridges, nuclear power plants, etc.
4Precautions：
1The production of prestressed steel bars, installation of anchors, fixtures, etc., application of prestressing, grouting, etc. should meet the design requirements and comply withJTG/TF50—2011Technical Specification for Construction of Highway Bridges and CulvertsTB/T3192-2008Provisional Technical Conditions for Pre stressed Concrete Prefabricated Beams of Passenger Dedicated Lines、GB/T25182-2010The Pre Stress Hole Grouting AgentDesign Specification for Highway Reinforced Concrete and Prestressed Concrete Bridges and CulvertsJTG3362-2018The regulations.
2The reference water cement ratio for mixing prestressed pipeline grout and cement slurry is0.26～0.28In the blenderfirstAdding actual mixing water80%～90%Start the mixer and evenly add all the slurry while stirring. Add all the powder and stir slowly2minThen quickly stir1minJoin the rest10%～20%Mixing water, continue mixing1min。
3The duration from the completion of self mixing of the slurry to the pressing into the pore should not exceed40min。
4The slurry should be continuously stirred before use and during the injection process. For cement slurry with reduced flowability due to delayed use, additional water should not be added to increase its flowability.
5During grouting, the temperature of the slurry should be maintained5℃～30Between ℃, otherwise measures should be taken to meet the conditions.
6The pre stress pressure slurry and water should be weighed accurately, and the water should be added strictly according to the determined water cement ratio. The amount of water added should not be adjusted arbitrarily.
7、Warm water mixing should be used for winter construction, and the construction temperature should not be lower than-15℃.
5Packaging and Storage：
1This product is packaged in a lined plastic woven bag with a net weight40±1kg/Bag.
2Store in a dry and ventilated room.
3The shelf life is six months.
