JH flocculant

1. Basic composition and performance
JH flocculant is a powdery concrete admixture composed of water-soluble polymer materials, surface active substances, etc. It has strong resistance to dispersion and good flow. It can achieve self-leveling and self-compacting of underwater concrete, inhibit the dispersion of cement and aggregate during underwater construction, and does not pollute the construction water area. The compressive strength of underwater concrete added with JH flocculant can reach more than 70% of the strength of land-based concrete with the same proportion when the water drop is 0.3 to 0.5m.
When the mix ratio in Table 1 is used, the performance of the underwater concrete at a height of 0.4m in the water is shown in Table 2:

2. Performance characteristics
The underwater concrete with JH flocculant added, It greatly simplifies the construction process, makes underwater concrete construction terrestrial, reduces the risk of construction to a great extent, reduces the comprehensive cost by more than 20%, shortens the construction period by about 30%, and this technology can also make the past Special structures such as thin-walled, narrow and special-shaped underwater structures that cannot be constructed can be realized.
1. Concrete added with JH flocculant has excellent resistance to dispersion in water. It does not disperse or segregate when falling in water. The cement rarely loses and does not pollute the environment. Concrete has good fluidity, and can be self-leveling and self-compacting when cast in water. There is no need for underwater vibrating, which simplifies the underwater construction process.
2. JH flocculant can be formulated into C15~C40 underwater non-dispersible concrete according to the needs of underwater projects to meet the requirements of different construction performance. The slump of non-dispersible concrete under water can reach 18-24cm, and it does not bleed or segregate. The initial setting is 5 to 40 hours, the final setting is 10 to 50 hours, and the setting time is adjustable. The impermeability can reach S10 or above, and the corrosion resistance coefficient is not less than 0.85.
3. JH flocculant has good compatibility with other admixtures. D300 freeze-thaw resistant concrete can be prepared by adding air-entraining water-reducing agent. It has no corrosion on steel bars and does not pollute the construction waters. After inspection by the health department, the flocculant is non-toxic and can be used in drinking water projects.
3. Construction instructions
1. Scope of application
Applicable to various underwater pouring concrete projects.
JH type flocculant can be used for caisson bottom sealing, cofferdams, caissons, riprap grouting, underwater continuous wall pouring, underwater foundation leveling and filling, RC slabs and other large-area underwater construction joint-free projects. Diameter cast-in-place piles, docks, dams, reservoir repairs, drainage outlet waterproof impact reinforced bottom plates, underwater caps, seawall revetments, slope protection, pile sealing and leakage sealing, and underwater projects that are difficult to construct with ordinary concrete.
JH underwater concrete is not limited by water depth, construction surface, and concrete volume (it has been constructed in various underwater projects with a maximum depth of 37.8m and a concrete volume ranging from a few cubic meters to several thousand cubic meters. When constructing concrete in the tidal section, it is also It is not affected by the tide.
2. How to use

(1) JH flocculant is a solid powder, with a dosage of 1.0 to 3.0% (accounting for the weight of dry cement powder). It is advisable to use the same mixing method. Add the cement and sand into the forced mixer at the same time.

(2) The mixer should be a forced mixer, and the mixing time is generally 3 minutes. If a self-falling mixer is used, the mixing time should be doubled.

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(3) When using traditional underwater construction equipment such as conduits and pumps, JH flocculant can be used at a low dosage of 1.5 to 2.0%; when using land construction equipment such as hanging tanks and chutes, that is, the concrete is in the water When there is a drop, the dosage should be 2.0 to 3.0%. In other cases, it can be increased or decreased appropriately according to the drop of the concrete in the water.

(4) The dosage of 3.0% should be used for pile sealing, and the pile body should be A low dosage of 1.5-2.0% can prevent pile breakage.

(5) Under normal circumstances, the coagulation time of JH flocculant increases with the increase in dosage. If necessary, it can be used with a coagulant.

(6) Priority is given to using 525# ordinary silicon cement. If there is no supply, 425# ordinary silicon cement can be used instead. When the concrete has a drop under water, the cement dosage should generally not be less than 380kg/m3.

(7) When underwater concrete is mixed with admixtures (slag or fly ash), the pumping performance can be significantly improved.

(8) The concrete proportion should be medium sand, and the recommended sand rate 38~43%, the stone grading generally adopts the range of 5~25mm, and the maximum particle size does not exceed 40mm.

(9) Underwater construction equipment such as conduits and pumping can be used for continuous construction, or openings can be used Suspension tanks, chutes, trolleys and other equipment are required to supply materials intermittently for construction.

(10) In principle, the construction environment requires still water conditions and a concrete drop of less than 0.5m.

IV. Packaging and storage
1. This product is lined with plastic film and wrapped in kraft paper woven bags, 25kg per bag;
2. Pay attention to moisture-proofing during transportation and storage. The storage period is generally 1 year. It can continue to be used without moisture. .

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