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High range superplasticizer special for subway tunnel segments (VF-4)

VF-4 is also suitable for pump concrete, precast concrete, fair-faced concrete, self-leveling mortar and etc.

Category

Polycarboxylate series


Detail

Applications

VF-4 is also suitable for pump concrete, precast concrete, fair-faced concrete, self-leveling mortar and etc.

Concrete of shield segment with VF-4 has great early strength function.

Concrete with VF-4 has good volume stability and can complete deviation value of physical dimension of shield segment is less than 1mm.

The surface of concrete member with VF-4 can reach the standard of fair-faced concrete which is bright external appearance, uniform color and less bubble.

Concrete with VF-4 has good thixotropy and won’t appear phenomenon of delamination and bleeding.

VF-4 has early strength and long-term strength.

VF-4 has less alkali content. It can increase durability of part and reduce alkali-aggregate reaction rate.

Properties

The dosage is typically 1.5%~3.5%, 2.0% is the best content.

VF-4 cannot be used with naphthalene based water reducing admixture.

Experiment must be done when VF-4 is used together with other admixtures.

Uniformity

Item
Results

Results

Item

Results

Appearance

Tan transparency liquid

pH  Value

7-9

Density (20℃)

1.09±0.02 g/ml

Chloride ion (%)

≤0.6%

Sulfate ion content (%)

2.9%

Surface tension

69(20℃dyn/c㎡)

Concrete performance with 2.0% dosage by binder mass

Test items

Classifications

Results

Standard

Set Retarding

Water reducing rate (%), ≥

14

14

20

Ratio of bleeding rate (%), ≤

90

100

27

Air content (%),

3.0

4.5

2.2

Difference in setting time(min)

Initial setting

-90~+120

﹥+90

+28

Final setting

+1

Ratio of compressive strength (%),

1d

140

181

3d

130

171

7d

125

125

161

28d

120

120

145

Ratio of shrinkage(%),

28d

135

110

Conclusion: the project is in line with “high performance water reducer” index of GB8076-2008.

Packaging, Transport and Storage

VF-4 is available in metal pail or iron tank. Other special package can also be available according to prior consultation.

VF-4 must be stored at the temperature above 0℃. Special measures should be taken to ensure entire package.

Dry and well ventilated warehouse is needed for storage. Quality guarantee of VF-4 is one year under normal conditions. If storage has surpassed the time, test must be done to confirm the validity.

Keyword

special

vf-4

concrete