Non-Dispersible Underwater Concrete, MNC-UWB Type

Characteristics

MNC-UWB type non-dispersible underwater concrete, as powder product, providesordinary concrete with superior resistance to dispersion, appropriate fluidityand satisfying construction performance. Thus, it has fundamentally solved thecontradiction among non-dispersible underwater performance, constructionperformance and mechanical properties, and also achieved self-leveling andself-compacting underwater without underwater vibrating. Besides, it featuresno segregation, small cement loss and no pollution to environment.

Compared with conventionalunderwater concrete, non-dispersible underwater concrete greatly simplifies theconstruction process, gradually makes land of concrete underwater constructionand reduces construction risk to a large extent. Also, this product can be usedfor special structure underwater such as thin wall, narrow structure, specialshape and so on which can not be achieved in the past.

Applications

To meet the requirements ofdifferent construction performance of underwater engineering, non-dispersibleunderwater concrete with 15 to 40 carbon atoms can be produced. Due to its goodmatching with other admixture, our product mixed with air-entraining agent can beused as D300 type freeze-thaw resistance of concrete. Also, it is applicable todrinking water with no harm inspected by hygiene department, and it has nocorrosion to steel bars and no pollution to construction waters.

Besides, non-dispersible underwater concrete can be used for bottom sealing ofcaisson, cofferdam, caisson, riprap grouting,underwater continuous wall casting, making level or filling on basis ofunderwater, RC board, large-diameter pile, wharf, large dam, reservoirs repair,reinforcing base plate with resistance to drain water impact, underwaterbearing platform, revetment of sea wall, slope protection, sealing pileplugging and underwater engineering which is difficult for construction usingordinary concrete.

Dosage
Non-dispersible underwater powder concrete mixed with cement and sandstone intoforced mixer at the same time is preferable with the dosage of 1.0% to 3.0% ofthe total amount.

Use Method and Packaging
1. Non-dispersible underwater concrete preferred 525 type ordinary Portland cement to 425 type one.
2. The amount of cement concrete in the underwater gap generally should not beless than 380kg/m³.
3. The pumping performance of underwater concrete mixed with admixture such asslag or fly ash can be significantly improved.
4. It is advisable to adopt medium sand with recommended sand percentage of 38%to 43% with stone gradation of 5 to 25mmand maximum particle diameter of less than 40mm.
5. Forced mixer is used for our product with stirring time of 3 minutes. If youadopt free-fall mixer, its stirring time is 6 minutes.
6. Setting time of our product delays with the increasing dosage and it can beused with coagulator in need.
7. In principle, construction environment demands for hydrostatic state withless than 0.5m of concretedrop.
8. Each bag of non-dispersible underwater concrete weighs 25kg.


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