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Concrete Admixtures

POLY-CARBOXYLATE SUPERPLASTICIZER 

1. Application 
Poly-Carboxylate is a superplasticizer for high performance concrete, high strength concrete, high  volume fly ash/slag concrete and grouting/self-leveling screed/mortar.

2. Characterstic
1) High early strength: Significant increase of early strength and 28d strength.
2) Low slump lose: Great reduction of  slump lose.
3) Excellent durability: Reduction of cracking , shrinkage and creep.
4) High water reduction: Water reduction more than 25% according to different application.
5) Environmental friendly products: Non pollution during production.

3.Technology
Poly-carboxylate-based water reducer is a kind of superplasticizer emerged in the early 80' s. It is mainly used in cement concrete. In chemistry, Poly-carboxylate-based is an organic and polymeric electrolyte. It belongs to a polymer surfactant. Therefore, it can also be applied in other paste materials such as gypsum products and ceramic products to reduce water content.
Poly-carboxylate is a weak electrolyte. It can only be fully dissolved in an alkaline solution .It can compound with cations in cement/water system to control the cement hydration process and thus to reduce the slump loss of the concrete. Poly-carboxylate achieves its water reducing effect through the yield of electrostatic repulsion and steric hindrance when it is absorbed to the cement particles. Hence, Poly-carboxylate is the most effective superplasticizer for cement concrete.
Poly-carboxylate is a raw material for superplasticizer. It is recommended that applicants should determine the Poly-carboxylate dosage in their own formulation according to their trial runs.

4. Specification
The specification of Poly-carboxylate is listed as follows.

Items

Specification

OS-L  40% liquid

OS-P 98% powder Concrete building materials

OS-A 98% powder
Dry building materials

Visual Appearance

Pale Bown Viscous Liquid

Light Yellow Powder

Light Yellow Powder

Density(23℃)

1.12±0.2

51 0 ± 10 ㎏ /m 3

51 0 ± 30 ㎏ /m 3

PH (23℃ )

9.0±0.5

(20% water solution)9.0±0.5

(20% water solution)9.0±0.5

Solid Content ( % )

40±2.0

98. 0 ± 1.0

98. 0 ± 1.0

Stability(0℃,24 hours)

No Crystallization

Stable

Stable

Cl -( % )

≤ 0.10

≤ 0.20

≤ 0.10

Na 2 SO 4( % )

≤ 4.0

≤ 15.0

≤ 4.0

Na 2 O+0.658K 2 O(%)

≤ 5.0

≤ 5.0

≤ 4.0

Viscosity

11 ± 2

11 ± 2

11 ± 2

Solubility

Very Soluble

Performance

Dosages for P.O 42.5 Standard Cement:(wt% of cement)

0.50±0.05

0.20±0.02

0.20±0.02

Cement Paste Flow(mm)

≥ 240

≥ 200

≥ 240

Water Reducing Of Mortar

≥ 20

≥ 18

≥ 20

The Performance of OS-L ,OS-P grade used in the concrete is as follows.Test items accords with China GB Standard. The following test standards are applied with dosages for P.O 42.5 Standard Cement:(wt% of cement),OS-P grade is dissolved into 20% water solution.The dosage is 1% (with cement volume), equivalent to the 2.0% in powder products dosages .

                              

                         

OS-L ,OS-P (20% water solution) Dosage (% of Cem)


Test Items

Unit

Specification

Water Reduction Rate

%

≥25

Compressive
Strength Ratio

1d

 

%

≥170

3d

≥160

7d

≥150

28d

≥130

Air Content

%

≤6.0

Bleeding  Ratio

%

≤60

Shrinkage (28d)

%

≤100

Setting Time Deff

Ini.

min

-90 ~ +120

Fin.

CL Penetration

coulomb

≤2000

F/T Cycles

Time

≥300

Slump Retention (60min)

mm

≥150

5.Dosage:
Different solid contents have different dosages in the cement,please check it as follows.
1)OS-L (40%) : 0.4~0.6
2)OS-P (98%):0.2~0.25%
3)OS-A (98%):0.2~0.3%

6.Application Method
1) Poly-carboxylate is used to produce high performance, high strength and flowable concrete.
2) Dosage of Poly-carboxylate is determined according to the designated concrete mix through trial mixing.
3) Poly-carboxylate is dosed either together with water or after the addition of water. It shows more effective when Poly-carboxylate is dosed after the addition of water.

7.Packing
Liquid :200kg/drum or IBC drum

Powder:  25kg/bag or 25kg/drum

   



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