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High Alumina Cement

High Alumina Cement
July 12
16:05 2014

High Alumina Cement High Alumina Cement High Alumina Cement High Alumina Cement

High Alumina Cement

High Alumina cement is produced by grinding clinkers formed by calcining bauxite and lime. The bauxite is an aluminium ore. It is specified that total alumina content should not be less than 32 per cent and the ratio by weight of alumina to the lime should be between 0.85 and 1.30. High Alumina Cement is known by the trade names of Cement Fondu in England and Lumnite in America.

Advantages of high alumina cement:

(i) The initial setting time of high alumina cement is more than 3 hours. The final setting time is about 5 hours. It allows more time for mixing and placing operations.

(ii) It can withstand higher temperatures.

(iii) It emits great heat during setting process. It is therefore not affected by frost.

(iv) It is highly resistant to acid attacks.

(v) It sets quickly and attains higher ultimate strength in a short period. Its compressive strength after 1 day is about 40 N/mm2 and that after 3 days is about 50 N/mm2

(vi) Its setting action mainly depends on the chemical reactions and hence is not necessary to grind it to fine powder.

Disadvantages of high alumina cement:

(i) The extreme care is to be taken to see that it does not come in contact with even traces of lime or ordinary cement.

(ii) It cannot be used in mass as it evolves great heat and as it sets soon.

(iii) It is expensive.

Get more informaton on Types of Cement

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