Description
High-efficiency CSA Expansive Agent is obtained by blending
suitable natural anhydrite with a specially manufactured clinker
which consists essentially of calcium sulphoaluminate and CaO.
High-efficiency CSA expansive agent is always mixed with ordinary
cement. When mixed in the proper proportions with ordinary cement
and hydrated, cement mortar or concrete expands during the early
stages of hydration. This expansion, when restrained, makes it
possible to minimize drying shrinkage. Moreover, when the ratio of
High-efficiency CSA Expansive Agent to ordinary cement is increased
its high expansion qualities make it ideal for use in prestressed
concrete.
High-efficiency CSA Expansive Agent is being
used in all sections of the construction fields and by a wide
variety of concrete products
manufacturers.Characteristics of
High-efficiency CSA Expansive Agent
â—‡Low
alkalinity. High-efficiency CSA Expansive Agent has a very low
alkali content (R
2O<0.3%) which is
beneficial to avoid AAR in concrete.
â—‡Short
stable stage of expansion. The stable stage of expansion is not
more than *4 days, thus the ultimate strength of concrete is not
affected.
â—‡Low dosage
and high expansion capacity. The normal dosage of High-efficiency
CSA Expansive Agent is 6~8% by the weight of ordinary cement, which
is lower compared with other expansive additives such as UEA and
CEA (their dosages are about *0~*2% by the weight of cement) in the
market.
Features by using High-efficiency CSA Expansive
Agent
â—‡Prevents
cracking due to drying shrinkage and hydration heats;
â—‡Increases
the water tightness of concrete and thus is useful for
waterproofing buildings;
â—‡Enables
the manufacture of high strength concrete products through chemical
prestressing.
Chemical Analysis
Main constituents (%) Based on Percent of Weight
CSA-â…
|
|
SiO2 |
Al2O3 |
Fe2O3 |
CaO |
MgO |
SO3 |
TiO2 |
Cl- |
Igloss |
|
Usual range |
5.5~7 |
5~7 |
1~2 |
*0~*2 |
2~4 |
*4~*7 |
<1 |
<0.*5 |
6~8 |
CSA-â…¡
|
|
SiO2 |
Al2O3 |
Fe2O3 |
CaO |
MgO |
SO3 |
TiO2 |
Cl- |
Igloss |
|
Usual range |
3~5 |
8~*0 |
0.5~1.5 |
*1~*3 |
2~4 |
*5~*8 |
<1 |
<0.*5 |
6~8 |
Mineral Composition: CaO, CaSO4, 3CaO 3Al2O3 CaSO4
Specific Surface Area: **0~**0 m2/kg Specific
Gravity: 2.8~3.0
