SJ - Underwater Anti-dispersal Grouting Material

I. Product Features:
Underwater anti-dispersal grouting material is suitable for various underwater concrete projects, including well sealing, cofferdams, caissons, rock grouting, continuous wall pouring underwater, leveling and filling of underwater foundations, and large-area underwater projects without construction joints such as RC boards. It is also used for large-diameter灌注桩, docks, dams, reservoir repairs, waterproofing and reinforcement of drainage outlet bottom plates, underwater footings, sea dyke revetments, slope protection, well sealing and leakage prevention, as well as underwater projects that are difficult to construct with ordinary concrete. SJ-Underwater anti-dispersal grouting material is not limited by water depth, construction surface, or amount of concrete (has been used in underwater projects as deep as 37.8m and varying concrete volumes from a few cubic meters to thousands of cubic meters. It is also unaffected by tidal water during concrete construction in tidal sections.
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II. Performance Specifications:
DL/T 5100-2014 "Technical Code for Water Conservancy Concrete Admixtures"
Inspection Item Specifications
Permeability rate, % < 0.5
Gas content, % > 4.5
Slump variation over time, mm 30min < 30
Anti-dispersible suspended solids content, mg/L < 150
pH value < 12
Setting Time, Initial Setting > 5h
Final Product (24)
Waterway strength ratio, %7d > 60
28d〉70
Section 3: Application Range:
Underwater non-dispersible grouting materials are suitable for various underwater concrete projects. They can be used for cofferdam bottom sealing, sheet piling, caisson, riprap grouting, underwater continuous wall casting, leveling and filling of underwater foundations, RC panels, and more. They offer large areas without construction joints, large-diameter cast-in-situ piles, wharfs, dam repairs, waterproofing and anti-erosion reinforcement of drainage outlets, underwater covers, sea dyke revetments, slope protection, pile foundation plugging, and underwater structures that are difficult to build with ordinary concrete. CGM's underwater non-dispersible grouting materials are not limited by water depth, construction surface, or concrete volume (with construction depths up to 37.8 meters and concrete volumes ranging from a few cubic meters to several thousand cubic meters). Tidal sections are unrestricted and influenced by tides.

IV. Construction Techniques:
Before grouting, prepare mixers, grouting equipment, molds, and maintenance items.
During the mixing of cementitious grouting materials, the water-to-material ratio should be 13%. It is strictly prohibited to add excessive water. It is advisable to first add 2/3 of the water and mix for about 3 minutes, then add the remaining water and mix until uniform. Mechanical mixing is recommended. The mixing location should be close to the grouting site. The mixed slurry should be used up within 15 minutes.
Data in the test report is measured under the national standard environment of (20±1)℃. If the ambient temperature is lower than this, the final setting time and the formation of standard strength will be delayed due to the slower reaction rate.
Underwater concrete structure renovation and reinforcement grouting:
The concrete surface in contact with the mud-based grouting material should be thoroughly roughened.
Reinforcement concrete structure defect repair: Remove loose concrete to expose the rebar, and cut the edges of the repair area into a vertical shape.
Prior to grouting, all debris, dust, or other foreign matter should be cleared, and the concrete base surface should be moistened.
Formwork: Support the grouting area with formwork, ensuring the top of the formwork is 20cm above the water level, and the water inside the formwork remains static.
Pour the well-mixed anti-dispersing grouting material into the mold and tap it gently. During the grouting process, water inside the mold will continuously be排出 as the grouting material is poured in, until the grouting is complete, ensuring all excess water is排出.
When the thickness of the grouting layer exceeds 150mm, appropriate measures should be taken to prevent temperature cracks from forming.

V. Maintenance Process:
During grouting, the average daily temperature should not be lower than 5°C. After grouting, the exposed parts should be promptly sprayed with curing agent or covered with plastic film, and kept moist with damp straw bags. When using plastic film covering, the exposed surface of the cement-based grouting material should be covered tightly to maintain condensation water inside the plastic film. If watering the grouting material surface is not convenient, curing agent can be sprayed.

Six - Packaging and Storage:
Shelf Life: Valid for 6 months from the date of manufacture.
Store in a cool, dry, and well-ventilated storage room.
Keep away from direct sunlight, rain, and ensure frost protection during winter.