Oreworld trade (Tangshan) co., Ltd

CSA Cement

Product Details:

CSA Cements Introduction:
CSA Cement, also named Calcium Sulfoaluminate Cement is a hydraulic binder based products. The Main characters of the CSA cement is fast setting, rapid hardening and high strength in 3 days.

Specifications of the CSA Cement

1.CSA cement Technical data;
1)CSA cement specific surface area: 350m 2 /kg min;
2)CSA cement Setting time: initial setting is not early than 25 minutes, final setting is not later than 3 hours. (It can be adjusted according to customer's requirements)
3)CSA  cement strength:

Index

Item

CSA42.5

CSA62.5

CSA72.5

CSA82.5

Compressing strength ,MPa
1d
3d

 

30.0
42.5

 

50.0

62.5

 

55.0
72.5

 

60.0
82.5

Bending strength, MPa
1d
3d

 

6.0
6.5

 

7.0
7.5

 

7.5
8.0

 

8.0
9.0

2.CSA cement Characters:
(1)Early high strength
Under standard condition, it's plastic mortar compressive strength of 12 hours can reach 30-40MPa, of 3 days can reach the grade strength. The concrete that prepared by CSA cement, when the water cement ratio is 0.5-0.6, the compressive strength of 6 hours under normal temperature can reach 5-10MPa while of 12 hours can reach above 20Mpa. Its early strength promotion rate over exceed rapid setting Portland cement. It's hydrate exothermic reaction develops with strength, centralize on early period. Under standard temperature, hydrate heat of 1 day take 70%-80% of total heat release. Its heat release volume is not high. One day heat release volume is around 55Cal/g, lower than Portland cement. one days heat release volume is around 50Cal/g, higher than Portland cement's heat release rate. 
(2). Rapid setting time
Under standard consistence water consumption, the initial setting is not early than 25 minutes, final setting is not later than 3 hours. CSA cement is obvious to see the setting time is quick. When prepare high early strength concrete, due to the water cement ratio is much bigger than standard consistence, initial setting of high early strength concrete is above 2-3 hours even at normal temperature. It can completely meet construction requirement. 
(3). Tiny expansion and low shrinkage
It produces crystal ettringite at early hydrate reaction. Crystal ettringite causes concrete have volume expansion. When preserving in water, early strength cement present expansion property without restriction. Cement mortar expansion & shrinkage rate please see the below table (mm/m).


Preserving condition

3 d

7d

14d

28d

60d

In water

+0.0690

+0.0697

+0.0763

+0.0763

+0.0763

In dry air

-0.104

-0.139

-0.174

-0.208

-0.215

    It also shrinks in air. But its shrinking rate is small. Please see the below table of comparison with Portland cement. Its 4 month dry shrinking rate is 1/3 of Portland cement.


Kinds

Ratio

3d

7d

28d

60d

120d

Portland cement

1:3:0.5

0.163

0.298

0.656

0.804

0.853

Calcium Sulfoaluminate Cement

1:3:0.5

0.060

0.094

0.174

0.238

0.256

(4). Low alkali
CSA cement(Calcium Sulfoaluminate Cement) hydrate reaction medium's alkali rate is low, the PH value is around 10.5~11 while Portland cement hydrate reaction medium's alkali PH value is around 13.
(5). Steel bar corrosion
After 7 days shaping, open the specimen of it, you will find corrosion on the surface of steel bar. But the corrosion does not develop since the following 1 ~10 months. And the weight loss rate is stable. From the recent 10 years research result for steel bar corrosion, steel bar corrosion degree is not growing with time.
(6). Durability of the CSA Cement
a. Freeze-thaw resistance
The testing result for freeze-thaw resistance of CSA cement(Calcium Sulfoaluminate Cement) completely proves it can meet the construction projects requirement of freeze-thaw 50 times. The testing method is rapid freezing. Concrete, water and cement ratio is 0.40, freeze-thaw circulation pass 200 times. Relative modulus of elasticity is 82%. 
b. Anti-permeability
Under pressure 30kg/cm2, its concrete specimen did not permeate.
c. resistance of heat
It shouldn't be used under temperature above 100 ℃ and structure that have acid resistance requirement.
d. Long period strength stability
The following table is the data of which It's six years compressive strength. You can see the strength is not shrinking but increasing.


Concrete mix

Compressive strength (Mpa)

1 month

3 months

6 months

1 year

2 year

6 year

1:1.33:2.71:0.42

41.5

45.0

49.0

51.9

52.3

55.1

1:1.69:3.69:0.50

36.1

38.8

41.3

43.1

45.1

46.7

1:2.30:4.58:0.62

31.18

33.3

34.3

35.4

37.9

39.8

e. Corrosion resistance
It has corrosion resistance to high concentration sulfate, magnesium salts, sodium chloride, bittern. Its corrosion resistance coefficient to those salts is as all above mentioned.

3. CSA cement Application:
CSA cement can be used for preparing anti-permeability, anti-freezing and sulfate resistance concrete. It is also used in construction in winter, injecting slurry, consolidation, rush to repair, leak stopping, complex geology small caliber running cementing, big prefabricated concrete structure, cast-in-place frame structure projects. It is specially used for producing glass fiber cement composite products, cement pipe, cement pole and man-made marble products. In engineering can cause multiples increase to output and economic value. It can also make the deadline for engineering project moved up largely. Super-high-strength It is fit to making concrete with performances of early strength, high strength (Above C60), impermeability, sulfate resistance. It is also used in construction at negative temperatures, segmental contactor, block, making cement products, large building engineering and it is used in mining support aw well as laneway support.
Transportation and storage:
Keep it away from damp, impurity and other cement.
4. CSA cement Packing:
by1-1.2 ton big bag

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