Henan Xijian New Building Materials Co., Ltd
Product
Prestressed Duct Grouting Material
Grouting material for ducts refers to a dry-mixed blend composed of cement, water-reducing admixture, expansion agent, mineral admixtures, and other materials. At the construction site, water is added in the specified proportions and the mixture is thoroughly stirred to produce a grouting material used to fill post-tensioned prestressed ducts.
Category:
Municipal products
Keywords:
Introduction
Product Overview
Grouting material for ducts refers to a dry-mixed blend composed of cement, water-reducing admixture, expansion agent, mineral admixtures, and other materials. At the construction site, water is added in the specified proportions and the mixture is thoroughly stirred to produce a grouting material used to fill post-tensioned prestressed ducts.
Product Specifications
Test Items |
Inspection Requirements |
Test Results |
|
Flowability (s) |
Initial fluidity |
10–17 |
14.32 |
30-minute fluidity |
10–20 |
17.85 |
|
60-minute fluidity |
10–25 |
21.53 |
|
Setting time (h) |
Initial setting |
≥5 |
6h50min |
Final setting |
≤24 |
12h30min |
|
Free Water Bleeding Rate (%) |
3h |
0 |
0 |
24h |
0 |
0 |
|
Bleeding rate between steel wires (%) |
3h |
0 |
0 |
Pressure Bleeding Rate (%) |
0.22MPa |
≤1.0 |
0.20 |
0.36MPa |
≤2.0 |
0.50 |
|
Free Expansion Rate (%) |
3h |
0 to 1.0 |
0.2 |
24h |
0–2.0 |
0.3 |
|
Limiting expansion rate (%) |
7 days in water |
0.03–0.10 |
0.05 |
Flexural strength (MPa) |
7d |
≥6 |
9.5 |
28d |
≥10 |
15.5 |
|
Compressive strength (MPa) |
7d |
≥40 |
49.3 |
28d |
≥50 |
60.1 |
|
Fullness |
Qualified |
Qualified |
|
Implementation Standard |
Complies with the requirements of JT/T 946–2022 “Grouting Materials for Prestressed Tendon Ducts in Highway Engineering.” |
Compliant with |
|
Product Advantages
Protect prestressing tendons from corrosion to ensure the integrity of prestressed structures. Maintain bond between the prestressing tendons and the concrete to facilitate transfer of prestress, enabling the tendon and concrete to act in concert. Reduce fatigue damage to anchorage devices caused by stress variations in prestressed concrete structures under cyclic loading, thereby extending the service life of the anchorage system and enhancing structural reliability.
1. High fluidity and no shrinkage
2. Micro-expansion, self-compacting
3. Early strength and high strength, with excellent homogeneity.
Scope of Application
Grouting of post-tensioned prestressed bridge ducts for various railway and highway projects.
Grouting of ducts in large-scale prestressed structures.
Leak-stopping grouting at joints in various concrete structures.
Curtain grouting, anchorage grouting, and void filling, among others.
How to use
1. Prior to grouting, start the grouting pump to discharge the grout through the grouting pipe, thereby removing air, water, and lean grout. Grouting may commence when the flow of the discharged grout matches the flow in the mixing tank. The grouting pressure for bridge grouting should generally not exceed 0.6 MPa.
2. Grouting shall be carried out until the grout fully fills the duct at the opposite end and begins to emerge, and until the vent hole discharges grout with a flow consistency identical to the specified value.
3. After the grout outlet is closed, a stabilization period with a pressure of no less than 0.5 MPa shall be maintained, and this stabilization period shall be no shorter than 5 minutes.
4. For continuous girders or when performing pressure grouting, allow the water–grout slurry in the pipeline to flow freely out of the outlet end. Then pump grout again until a uniform grout mixture emerges from the outlet, and maintain a pressure of 0.5 MPa for 5 minutes. This procedure may be repeated 1 to 2 times.
5. After grouting the bridge, whether to perform supplementary grouting should be determined based on the compactness of the grout discharge, so as to ensure full compaction of the grouting holes.
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Contact Information
Phone:+86-400-6786-157
Mobile phone:+86-13838719394
Email:m13838719394@163.com
Address: 30 meters ahead of the South Ring Bridge No. 2, South Ring Road, Industrial Park, Shangji Town, Xichuan County, Nanyang City, Henan Province
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