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

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

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    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.

    Corresponding parameter set not found, please add it in property template of background
    暂未实现,敬请期待
    暂未实现,敬请期待
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