Post-tensioned bridge steel strand duct grouting expansive material - grouting agent manufacturer
Product Introduction
After the prestressing tendons are tensioned and anchored, the pre-stressed duct should be grouted as soon as possible.48hPre-stressed pipe grouting material excels in performance for this grouting requirement, featuring good fluidity, no bleeding or segregation, excellent durability, non-corrosion of prestressed steel bars, strong bonding with concrete, full grouting with early strength, slight expansion for high filling, and one-time grouting capability with dense paste inside the pipe without any voids. The product is easy to use, requiring only the addition of water before use, and complies with the "Technical Specifications for Construction of Highway Bridges and Culverts."JTG/T F50—2011"Railway Post-Tensioning Prestressed Concrete Beam Casing Grouting Technical Conditions"TB/T3192-2008) and "Pre-stressed Hole Grouting Agent"GB/T25182-2010Standard Requirements.
Post-tensioned duct grouting material main properties
Item Objective Performance specifications Test Results
Water-to-binder ratio%) 0.26～0.28 0.27
Setting Timeh） Initial setting ≥5 8:30
Final Coagulation ≤24 11:30
Liquidity25℃）（s） Initial liquidity 10～17 15.2
30minLiquidity 10～20 16.1
60minLiquidity 10～25 17.4
Bearing Rate%） 24hBleeding Rate 0 0
3hWire interstitial water rate 0 0
Pressure Leach Rate%） 0.22MPa (Hole vertical height ≤1.8mPlease provide the Chinese content to be translated. ≤2.0 1.0
0.36MPa (Hole channel vertical height >1.8mPlease provide the Chinese content to be translated.
Inflation Rate%） 3h 0～2 0.3
24h 0～3 1.1
Fulfillment Qualified Qualified
Compressive StrengthMPa） 3d ≥20 53
7d ≥40 67
28d ≥50 76
Flexural strengthMPa） 3d ≥5 11.5
7d ≥6 12.6
28d ≥10 14
Corrosive effect on rebars Rust-free Rust-free
Section 3: Post-tensioned hole grouting material main features
1Good liquidity, high strength, non-sweat, non-delamination.
2Excellent durability, no aging, no corrosion to rebar, durable and robust.
3The slurry has properties of full early strength and slight expansion.
4The product boasts high compaction, allowing for one-time slurry application, ensuring a dense, gap-free slurry inside the pipeline.
5Pre-stressed rebars are corrosion-resistant and have a strong bond with concrete.
6Convenient to use, just add water and it's ready.
Four Post-tensioned duct grouting material application range
Suitable for grouting operations in cement slurry, cement mortar, and cement concrete, particularly ideal for post-tensioning grouting construction in large-scale projects such as ordinary highways, expressways, high-speed railways, bridges, and nuclear power plants.
Five. Post-tensioned duct grouting material usage precautions
1The manufacturing of prestressed steel strands, the installation of anchors and clamps, the application of prestress, grouting, etc., should meet the design requirements and comply withJTG/TF50—2011"Highway Bridge and Culvert Construction Technical Specification"TB/T3192-2008"Temporary Technical Conditions for Prestressed Concrete Precast Beams for Passenger Dedicated Lines"GB/T25182-2010Specification for Prestressed Channel Grouting Agent
2The recommended water-cement ratio for mixing the cement slurry for prestressed pipe grouting is:0.26～0.28Add actual mixing water to the blender80%～90%Start the mixer, uniformly add all the slurry material, stirring continuously as you add. Add all the powder material while stirring slowly.2minThen, stir quickly.1minAdd the remaining10%～20%Mixed water, continue stirring1min。
3The duration from the completion of slurry mixing to its insertion into the bore should not exceed40min。
4The slurry should be continuously stirred before and during the injection process. Do not increase the fluidity of the cement slurry that has decreased due to delayed use by adding extra water.
5During grouting, the slurry temperature should be maintained5℃～30Between ℃, otherwise measures should be taken to meet the requirements.
6Pre-stressed pipe grouting material, with precise water measurement and strict adherence to the predetermined water-cement ratio when adding water; no arbitrary adjustment of water quantity is allowed.
Six. Post-tensioned duct grouting material packaging and storage
1This product is packaged in a lined plastic woven sack, net weight40±1kg/Bag.
2Store in a dry, well-ventilated room.
3Shelf life: 6 months.
