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Non-dispersible Underwater Concrete Admixture (UWB)
Product Name: Non-dispersible Underwater Concrete Admixture (UWB)
Type: UWB
Package: 25kg/bag

Non-dispersible Underwater Concrete Admixture
(UWB)

■ Description

UWB is a powder form concrete admixture which made from water-soluble high molecular polymer and surface active materials. UWB has excellent dispersing resistance and high fluidity performance. Owning to its self-leveling and self-compacting properties, UWB restrains cement and aggregate dispersing under water.

■ Application
High fluidity concrete, like gap filling work; 
High quality underwater concrete, especially material segregation concerned;
Construction works which particular attention should be taken to avoid water pollution;
Underwater reinforced concrete structures;
Stone consolidation;

Construction restoration.

■ Technical Data Sheet
Table 1 is according to the concrete construction underwater 0.4m depth, table 2 and table 3 are the concrete properties compatible with table 1.
Table 1

Concrete Preparation

Aggregate Size (mm)

Water Cement Ratio

Sand Ratio (%)

Quantity (kg/m3)

Water

Cement

Sand

Rock

UWB

5 - 25

0.45

41

180

400

740

1060

8


Table 2

Concrete Properties

Slump (cm)

Air Content (%)

Bleeding Rate (%)

Cement Loss Rate (%)

Setting Time (hours)

Initial Setting Time

Final Setting Time

22

4.5

0.1

0.1

19

25


Table 3

Concrete Strength (28 days)

Compressive Strength (MPa)

Central Compressive Strength (MPa)

Central Tensile Strength (MPa)

Flexural Strength (MPa)

Reinforcement Adhesiveness (MPa)

Modulus of Elasticity (MPa)

Impermeability Index

24

20.8

2.94

4.66

1.93

2.16×104

S24


■ Package, Storage & Handling
For powder: Woven fabric bag with plastic liner. Net weight: 25kg /- 0.13 kg.
Cautions should be taken to prevent packages from being torn by sharp-ended objects while being transferred or delivered. When being contaminated by high humidity or moisture in case of leakage, it can be prepared in prescribed ways for further use without surrendering any effect.

It should be stored in a dedicated warehouse that is well-ventilated and dry. It remains effective in one year.


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