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Retarding water reducing admixture JF-4

JF-4 is made of set retarder and water reducing agent.

Category

Naphthalene series


Detail

  Applications

  JF-4 is made of set retarder and water reducing agent.

  JF-4 can delay the setting time of concrete, hold the plastic of freshly mixed concrete in the long term and be good for moulding by casting under the condition of high temperature in summer.

  When JF-4 applied to guss concrete, it can increase the cohesiveness of the concrete and reduce slump loss, concrete disintegration and concrete bleeding.

  JF-4 can reduce the hydration heat and temperature crack, and also can delay the peak heat release, when a mass concrete is concreting continuously.

  JF-4 is essential to additive in the summer of concrete construction.

  JF-4 is applicable for commodities which are concreted by various portland cement, pump concrete and mass concrete.

  JF-4 isn’t suitable for the steamed concrete and cement admixture which is made by anhydrite and fluorgypsume.

  Properties

  Dosage: for powder 0.5-1.0%. for liquid 1.5-3.5%

  Adding 1.0%; retarding time: 1 – 3 hours.

  Air content increased slightly.

  Retention value of slump constant: 1h≥90%

  Use it in the above 5 degrees celsius temperature conditions.

  Uniformity

Item

Results

Item

Results

Appearance

Power

Isabelline powder

Cement paste fluidity(mm)

≥160

liquid

Brown liquid

Fineness(0.315mm),<

5%

Moisture content of Power (%)

5±1%

Chloride ion (%)

≤0.6%

Liquid density ((20℃))

1.18±0.02 g/ml

pH  Value

7-9

  Concrete performance with 0.75% dosage by binder mass

Test item

Quality index

Results

Hardening accelerating

Standard

Set retarding

Water reducing rate (%), ≥

8

8

8

16.0

Ratio of bleeding rate (%), ≤

95

100

100

0

Air content (%), ≤

4.0

4.0

5.5

4.5

Difference in setting time(min)

Initial setting

-90~+90

-90~+120

﹥+90

+183

Final setting

Ratio of compressive strength (%), ≥

1d

135

3d

130

115

7d

110

115

110

110

28d

100

110

110

115

Ratio of shrinkage(%), ≤

28d

135

120

  Conclusion: the project is in line with retarding index of “water-reducing admixture” of GB8076-2008.

  Packaging, transport and storage

  Powder JF-4 is available in 25kg film-lined bags. Liquid JF-4 is available in sealed plastic or iron tank. Other special package can also be available according to prior consultation.

  Special measures should be taken to ensure entire package. Keep waterproof during transportation.

  Dry and well ventilated warehouse is needed for storage to prevent absorption of moisture and agglomeration. If storage has surpassed the time, test must be done to confirm the validity.

Keyword

concrete