Year1
- 袋装：
- 25kg
Beijing factory supplies high-efficiency underwater non-dispersible concrete flocculant Contact information: Contact person: Liu Xiaohong
Implementation standard: B
1. Basic composition and performance
Underwater non-dispersible concrete flocculant It is a powdered concrete admixture compounded by water-soluble polymer surface active substances. It has strong resistance to dispersion and good fluidity. It can achieve self-leveling and self-compacting of underwater concrete and inhibit underwater construction. The cement and aggregate are dispersed and the construction water area is not polluted. When underwater concrete is added with underwater non-dispersible concrete flocculant, its compressive strength can reach more than 1% of the strength of land-based concrete with the same proportion when the water drop is ~.
The performance of underwater concrete at a drop in water when using the surface mix ratio is as shown in the table:
Surface concrete mix ratio
Coarse aggregate particle size
Water-cement sand ratio
br /> (%) Unit dosage ( )
Water, cement, sand and gravel B
~
Surface concrete performance indicators
Slump
Air content
( %) Bleeding rate
(%) Cement loss rate
(%) Setting time Initial setting Final setting
＜＜
Surface concrete strength index
Compressive strength< br /> Axial compression
Axial tensile strength
Flexural strength
Steel bar bonding strength
Elastic modulus and impermeability code
Two technologies Indicators
Name Ordinary type Early strength type Pumping type Low heat generation type High performance type
Dosage (occupied cement amount), %~~~
Value＜＜＜＜＜
Suspended solids, ＜＜＜＜＜
Air content, %＜＜＜＜＜
Freeze-thaw cycle,
Impermeability label, ＞＞＞＞＞
Slump,
Initial expansion,
Initial setting time, ＞＞＞＞＞
Final setting time, ＜＜＜＜＜
Flexural strength,
Flexural strength,
Compressive strength,
Compressive strength,
Water-to-land strength ratio, %＞＞＞＞＞
Water-to-land strength ratio, %＞＞＞＞＞
Three properties Features
Compared with conventional underwater concrete, underwater non-dispersible concrete greatly simplifies the construction process, makes underwater concrete construction terrestrial, and reduces the risk of construction to a great extent, reducing the overall cost% Above, the construction period is shortened by about %, and this technology can also realize special structures such as thin-walled, narrow and special-shaped underwater structures that were previously impossible to construct.
Underwater non-dispersible concrete flocculant has excellent resistance to dispersion in water. It does not disperse or segregate when falling in water. The cement is rarely lost 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.
Underwater non-dispersible concrete flocculants can be formulated 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 ~, without bleeding or segregation. Initial setting~, final setting~, setting time is adjustable. The anti-permeability can reach above and the corrosion resistance coefficient is not less than.
Underwater non-dispersible concrete flocculant has good compatibility with other admixtures. Adding air-entraining agent can prepare freeze-thaw resistant concrete. 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.
Quality indicators of non-dispersible concrete under surface water
Project indicators
Slump~
Setting time Initial setting~
Final setting~
Drop test in water< br /> Suspended solids ( )＜
Value＜
Concrete compressive strength
Formed concrete in water
Compressive strength of specimen R
R
In water and concrete formed in air
Ratio of the compressive strength of the specimen %
Flexural strength of concrete Concrete formed in water and air
Ratio of the flexural strength of the specimen %
/>
Four construction instructions
Scope of application
Suitable for various underwater pouring concrete projects.
Underwater non-dispersible concrete flocculant can be used for leveling and filling of caisson bottom seals, cofferdams, caissons, riprap grouting, underwater continuous wall casting, underwater foundations, large-area underwater construction joint-free projects such as R boards, and large-diameter cast-in-place piles. Wharf dams, reservoir repairs, drainage outlets waterproof impact reinforcement bottom plates, underwater caps, seawalls, bank protection and slope protection, pile sealing to plug leaks and underwater projects that are difficult to construct with ordinary concrete.
The underwater non-dispersible concrete flocculant is not limited by the water depth and the amount of concrete on the construction surface (it has been constructed in various underwater projects with the deepest concrete volume ranging from a few cubic meters to several thousand cubic meters. When constructing concrete in the tidal section, it is not restricted. Affected by the tide.
Application fields
The ordinary type is suitable for underwater projects without special requirements.
The early-strength type is suitable for areas with large tidal differences and where rapid concrete construction is required for disaster relief and rescue operations. Hard and strong underwater engineering. The strength of this type of flocculant can reach above, and the setting time can be adjusted according to the actual situation. The concrete can be initially set on the left and right at the fastest, so that the erosion resistance of the concrete is enhanced.
Pump The delivery type is suitable for pumpable underwater concrete that requires greater fluidity, less fluidity loss, and long-distance transportation.
The low-heat type is suitable for large-volume underwater concrete pouring and continuous underwater components. Pouring. This type of underwater concrete can effectively reduce the hydration heat of cement and improve the durability of underwater concrete.
The high-performance type is suitable for important water applications such as large underwater drop heights and high strength requirements. Fast water flow and other important water conditions Underwater projects. Note: According to different underwater construction conditions, our company has also developed a compound flocculant. Its characteristic is that according to the actual conditions of local underwater projects, the dosage of various single components in the flocculant can be adjusted to meet the needs of Engineering needs.
Usage
The underwater non-dispersible flocculant is a solid powder, and the dosage is ~% (accounting for the weight of dry cement powder). It is advisable to use the same mixing method, and add the cement sand and gravel to the forced mixer at the same time.
The mixer should be a forced mixer, and the mixing time is generally . If a self-falling mixer is used, the mixing time should be extended by 2 times.
When using traditional underwater construction equipment such as catheter pumps, the concrete will not be dispersed underwater. The flocculant can be used at a low dosage of ~%. When using land construction equipment such as hanging tanks and chutes, that is, when there is a drop in the concrete in the water, a high dosage of just ~% can be used. In other cases, it can be increased or decreased appropriately according to the drop in the concrete in the water. , it is generally recommended to be ~%.
It is advisable to use a high dosage of ~% for pile sealing, and a low dosage of ~% for the pile body to prevent pile breakage.
Underwater non-dispersible flocculant will coagulate under normal circumstances The time will be extended as the dosage increases. If necessary, it can be used with a setting regulator.
Priority is given to ordinary silicon cement. When there is no supply, ordinary silicon cement can be used instead. When the concrete has a drop under water, the cement dosage should generally not be low. In.
When underwater concrete is mixed with admixtures (slag or fly ash), the pumping performance can be significantly improved.
The concrete proportion should be medium sand, the recommended sand rate is ~%, and the gravel grade The distribution generally adopts ~ range, and the maximum particle size does not exceed.
Underwater construction equipment such as catheter pumps can be used for continuous construction, and equipment such as open hanging tanks, chute trolleys, etc. can also be used for intermittent supply construction.
Construction environment In principle, it is required to be in a still water state, and the concrete drop should be less than 0.
Usage
The flocculant passed the appraisal of the Ministry of Petroleum in 2015, and was concluded to fill the domestic gap and reach the international advanced level in the same period. In the same year, it was awarded the national invention patent, and the national scientific and technological achievements in 2016 , a national-level new product, a key promotion project of scientific and technological achievements of the Ministry of Construction in 2017, and the flocculant obtained a national patent in 2018. It has been used in hundreds of underwater projects in the Yangtze River, Yellow River, Yalu River, Songhua River, Qiantang River, Yellow Sea, Bohai Sea, and South China Sea. The amount of concrete is nearly 10,000, and the construction water depth ranges from 10 to 10,000. The effect is good, and the overall cost of underwater concrete projects has been reduced by ~%. The underwater concrete pouring construction period has been shortened by more than %, and obvious technical and economic benefits have been achieved.
Some project examples
The caisson bottom cover of the Fourth Xiangjiang Bridge in Changsha and the low pile cap of the Zhongwei Yellow River Bridge
Large-diameter cast-in-place piles in Shengli Oilfield A military artificial island in Nansha
Qiantang River embankment reinforcement
/> Five Packaging and Storage
Packaging: This product is lined with plastic film and outer kraft paper woven bag, each bag
Storage: Pay attention to moisture-proof during transportation and storage. The storage period is generally one year, and it is not subject to moisture. Can continue to be used.
Beijing factory supplies Tianjin direct sales and recruits national agents
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