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 requirement);
3)CSA cement strength:
Compressing strength ,MPa
Bending strength, MPa
2.CSA Cement Characteristics:
(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).
In dry air
It also shrinks in air. But its shrinking rate is small. Please see
the below table of comparison with Portland cement. It's 4 month
dry shrinking rate is 1/3 of Portland cement.
Calcium Sulfoaluminate Cement
(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.
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%.
Under pressure 30kg/cm2, it’s 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.
Compressive strength (Mpa)
e. Corrosion resistance
It has corrosion resistance to high concentration sulfate,
magnesium salts, sodium chloride, bittern. Its corrosion resistance
coefficient to those salts are all above 1.
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 Construction method
1. When prepare concrete, cement dosage should more than 300kg/m3,
reference water/cement ratio is 0.4-0.5, cement/sand ratio is
1.17-1.2, sand ratio is 32%-35%.
2. Concrete pouring. In order to make concrete meet the basic
requirements of even compacting and ametabolic, and keep concrete
have good integrity, pour the concrete homogeneously and in
sequence into structural pouring position. Try to do this work
3. Curing. The purpose of curing is to protect the concrete
properly during the concrete becoming hard; reach the demanding
strength in regulated time, reduce shrinkage, prevent crack or
4. Demoulding. Concrete moulding board’s demoulding time should be
determined by fabric variety and reached strength. Some un-bearing
mould can be removed firstly if the concrete surface, edges and
corners are not be broken. Bearing mould should be dispose
separately according to structural variety and span size.
5.Notice in using CSA Cement:
1 It’s concrete mix ratio is determined by trial method. The lowest
using quantity of CSA cement(Calcium Sulfoaluminate Cement) is more
than 280kg every cube meter concrete. Water-cement ratio should be
2 Don't watering stir or vibrate second times after It’s mortar or
concrete does not has mobility.
3 Don't mix other kinds of cements and lime with high alkali.
4 It is necessary to cure it's concrete on moisture condition after
final setting of it’s concrete in Summer. Curing term is more than
5 Weather-proof and insulation is necessary in Winter when using
it.Must add 0.5%-4% frost preventing agent into it’s concrete.
6 It is unfit heat resistance engineering and location. The cement
product steam-cured temperature value is not less than 8 0 ℃ . The
best steam-cured temperature is 60-7 0 ℃ . The steam-cured term is
more than 2 hours.
6.CSA Cement Packing:
by 50kgs bag. Store in shady, cool and dry place. Avoid stamp and
mix with other substance