Specialty cement technology-Rapid set CSA cement, High performance of concrete and mortars
CSA cement, full name
is Calcium Sulfoaluminate cement, was invented and developed in China since 1970's. It is 100% cement, get ready to use. As the third generation of
cements, it is widely used on construction for decades in China.
The cement has been
used on concrete for bridges, airports, concrete road repair, winter
construction and many other applications where early strength and time
needed.As well as high strength concrete, high performance of mortars, like
Self levelling compounds,tile adhesives,Non shrinkage grouts,etc.
The product obtained
by grinding cement clinker obtained by roasting suitable raw material,
consisting essentially of anhydrous calcium sulphoaluminate and dicalcium
silicate. Suitable gypsum and 0-10% limestone shall be blended with clinker
during manufacture of rapid-hardening sulphoaluminate cement. The
rapid-hardening cement product is hydraulicity binding material. It has high
early strength. The code no is R-SAC.
Specific surface
area(m2/kg): ≥350
Setting time(min):
Initial setting time: ≥25 Final setting time: ≤180
(Remark: the
setting time can be adjusted according to demand.)
The initial set of
the CSA cement begins after approximately twenty minutes and its final set is
then arrived after ten more minutes. With the use of retarders, the processing
time can be considerably extended. Even in low temperature environments CSA
cement is workable, because of its concentrative hydration.
When CSA cement is applied to concrete or mortars it vastly increases its strengths and its strength development. Compared to Portland cement, CSA cement could reach hours strength, 1 day strength could reach 60%-70% of the grade strengths, and within 3 days to achieve strength of portland cement in 28 days.
Properties
of CSA cements:
1.
High early strength and final strength
Its
compressive strength can reach 35-50Mpa within 1 day, 50-70Mpa after 3 days,
and it also can grows continually with the increasing of curing age.
2.
Fast setting time, Rapid hardening
3.
High impermeability: Because of its dense structure, the impermeability of the
concrete is 2-3 times than that of OPC in same grade.
4.
Anti-carbonation property: It has good anti-carbonation property, and low
dry-shrinkage.
5.
Corrosion-resistance: Rapid-hardening cement has good corrosion-resistance
quality, especially much better in seawater corrosion resistance than that of
high anti-sulphate Portland cement, with more than 1 corrosion-resistance
coefficient.
6.
Low alkalinity, low PH value
7.
Little expansion, lower shrinkage, etc.
Applications:
1.Construction
in winter.
2.Urgent
repairs and rapid construction.
3.Spraying
anchor and supporting engineering.
4.Water
conservancy facilities and offshore projects.
5.Bridge
and road construction.
6.Cement
products and prefabricated components.
7.Industrial
and civil engineering
8.
Mining industry
9.
GFRC/GRC industry, etc.
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