Jintongbao Technology Group Co. , Ltd.
Prestressed Duct Grout

Prestressed Duct Grout

JTB Prestressed Duct Grout is specifically engineered for post-tensioning tendon duct grouting applications. It exhibits high fluidity, superior compressive strength, and contains no corrosive agents harmful to prestressing steel. The product meets all technical requirements specified in standard JTG/TF 50-2011.

Product Features

• High flowability & compressive strength
• Reliable durability & aging resistance
• Rapid early strength, slight expansion
• Strong bonding
• Easy to apply

Applications Scenarios

• Grouting for post-tensioned beam ducts, ground anchor systems, diaphragm wall seepage stops, and curtain grouting
• Equipment foundation grouting, beam-column joints, emergency repairs, and floor anchor grouting
• Void grouting for high-strength prestressed concrete elements; road & bridge strengthening
• Reinforcement for precast floor slabs, bridge pre-installed joints, and other structural strengthening

Construction Craft

• Cleaning: Before construction, flush the channels with pressurized water to remove debris and accumulated water from the beam channels.
• Proportioning and mixing: In the JTB Prestressed Duct Grout, add 28% water in proportion and stir thoroughly for approximately 3 minutes.
• Construction: Before grouting, the grouting pump should be started first to allow a small amount of slurry to be discharged from the grouting nozzle, so as to remove the air, water and thin slurry in the grouting pipeline. When grouting, follow the grouting sequence from bottom to top. Grouting for the same pipeline should be carried out continuously and completed at one time. The time from the stirring of the slurry to its injection into the beam body should be less than 40 minutes.
• Note: The filling degree of the grouting should reach the point where the other end of the channel is full and the cement slurry with the same flow rate as specified is discharged from the exhaust hole. After closing the slurry outlet, a pressure stabilization period of no less than 0.5MPa should be maintained, and the duration of this pressure stabilization period is preferably 3 to 5 minutes.

Packaging and Storage

Packaging specification: Packed in kraft paper woven bags, net weight 40 kg ± 1 kg per bag.

Storage: Store in a dry and well-ventilated indoor area.

Shelf life: 6 months.

Safety Specifications

The product contains chemical ingredients that can irritate the eyes and skin. Please wear the necessary protective gear during construction. In case of accidental eye contact, flush immediately with plenty of clean water and seek medical attention promptly.

Key Technical Indicators
Technical indicators Standard requirements
Fluidity (s) Initial value 10~17
30min 10~20
Flexural strength (MPa) 28d ≥10
Compressive strength (MPa) 3d ≥20
7d ≥40
28h ≥50
Expansion rate (%) 3h 0-2
24h 0-3
Construction Gallery

JTB are committed to providing customers in all sectors with valuable products and
solutions that offer convenience and efficiency.

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About
Jintongbao Technology Group Co. , Ltd.
Jintongbao Technology Group Co., Ltd. is a service provider of reinforcement system solutions integrating R&D, production, sales and construction. Since its establishment, the company has been deeply engaged in the field of reinforcement.
Currently, it has three large-scale production bases in Zhenjiang, Jiangsu Province, Jinhua, Zhejiang Province, and Dongguan, Guangdong Province, with a total production capacity of over 500,000 tons. Among them, the factory in Zhenjiang, Jiangsu Province, holds an important position in the company's production system. The factory covers a vast area and has standardized, modern production facilities. The large-scale production layout enables it to have a strong capacity reserve, and its annual production capacity ranks among the top in the company's three major production bases. This enables the Zhenjiang factory to achieve large-scale, continuous production of grouting materials and other products and to respond quickly to large-scale supply demands. Meanwhile, we have a sales network covering the whole country as well as some countries and regions in Southeast Asia. We can ensure the convenience and efficiency of providing valuable products and solutions for customers in various fields, such as urban renewal, airports, Bridges and tunnels, waterproofing and anti-corrosion, wind power and nuclear power, etc.
Our company has always adhered to taking technological innovation as its core competitiveness and attaches great importance to and supports technological innovation.  Our R&D center is equipped with advanced experimental equipment and R&D tools, providing a solid hardware foundation for innovative work. Meanwhile, the R&D center boasts a high-level R&D team. As an industry benchmark leader, we attach great importance to industry innovation and were the 1st to propose the concept of "from reinforcement to pre-reinforcement". Actively leverage its industry experience and technological advantages to assist in the formulation and introduction of new standards, enabling it to better serve the industry and promote its healthy and sound development.
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