Description of Calcium aluminate cement
Calcium aluminate clinker cement, alumina cements or high alumina cements are obtained by the reaction at high temperature of lime (from limestone) and alumina (contained in natural minerals like bauxite). The product obtained after cooling is a hard mineral: calcium aluminate clinker. Ground into a fine powder, the clinker becomes calcium aluminate cement (CAC) which forms a paste when mixed with water. This has the ability to harden very quickly: it forms a rigid solid within 24 hours.
Application of calcium aluminate cement
There are two distinct ways to use calcium aluminates: as high-performance binders and as mineral reagents in a variety of industries.
As binders, calcium aluminates are used
in concretes and mortars for specialized applications for their
properties of resistance to corrosion, abrasion and heat combined
with rapid hardening and the ease of controlling grading
variations.
Calcium aluminate cements are also used
in combination with other fine components. Hydraulic binders with
new properties are then obtained. In this way, aluminates act as
both a complex hydraulic binder and a mineral reagent interacting
with the other components in the mix.
As reagents, calcium aluminates are found
in non-hydraulic systems. This is the case in metallurgical
treatments (iron and steel industry, foundry) where specific
grades of calcium aluminate are used for their low-temperature
melting properties and for trapping molten metal
impurities.
High temperature alumina cement CA50 specification:
Index |
Item |
|
CA50-625 |
CA50-725 |
|
Al2O3, % |
≥50, <60 |
≥50, <60 |
SiO2,% |
≤8.0 |
≤8.0 |
Fe2O3,% |
≤2.5 |
≤2.5 |
Specific surface area, m2/Kg |
≥300 |
≥300 |
Setting time |
≥30 |
≥60 |
Compression strength , MPa |
40 |
64.7 |
Bending strength, MPa |
5.5 |
6.9 |
Calcium Aluminate Cement Construction method:
1. When preparing refractory concrete,
fix on the aggregate according to using condition. Choose the
proper capacity graduation to make maximum density. Be noted to
match and adapt with cementing material.
2. According to certain proportion, add
water and mix by man or machine into mortar and then begin
casting construction. Use up the ready mortar within 40 min.
Calcium Aluminate Cement’s
hydration heat concentrate on early stage. Casting thickness
should not exceed 3 cm each time. Water curing immediately when
concrete goes hardening and the curing time should not less than
3 days.
3. When prepare expanding cement, Calcium
Aluminate clinker’s
dosage is 73-76%, CaSO4·2H2O dosage is 24-27%. When prepare
self-stressing cement, the mixing ratio of
CaSO4·2H2O should be increased.
Calcium Aluminate Cement Notice:
1. In order to avoid uncontrollable
setting time, do not mix with Portland cement, lime etc of which
separate out calcium hydroxide cementing material. Before use,
clean all the mixing machinery.
2. Steam curing to accelerate
concrete’s
hardening. The curing temperature should not higher than
50℃.
3. Refractory concrete’s
late strength decline big, design should according to the lowest
stable strength. CA-50 bonded concrete’s
lowest stable strength should be determined by the lowest
strength of 7-14 days of demoulding sample curing in
20℃±1℃ water.
Calcium aluminate Cement
Packing:
by 50kgs bag. Store in shady, cool and
dry place. Avoid stamp and mix with other
substance.
Where to Buy Calcium Aluminate
Cement
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