admin
1156 posts
TimePosted 22/08/2006 10:21:13
admin says

Chemicals Question 2

We are using synthesized calcium sulphate anhydrite from a nearby aluminium plant. This calcium sulphate (96 per cent purity) is fine in form and free from moisture. In addition to CaSO42. Can Calcium sulphate be used as an alternative retarder for the Natural Gypsum? Your expert opinion on the solubility of this synthetic calcium sulphate anhydrite is appreciated.

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admin
1156 posts
TimePosted 22/08/2006 10:21:13
admin says

Re: Chemicals

The solubility of anhydrite varies dependent on the temperature history to which it has been subjected. However, I am sure this will be a good material to use as a set-controlling additive in your cement. You may need to use it in combination with your natural gypsum or you may be able to replace your natural gypsum with 100 per cent of this material. The only way to find out will be to conduct trials with the synthetic CaSO4.

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admin
1156 posts
TimePosted 22/08/2006 10:21:13
admin says

Chemicals Question 3

What is the purpose of triethanolamine in cement? Is it (triethanolamine) also in admixtures (water reducer, air entraining, superplasticizer, for example) for concrete? Could this chemical affect the final appearance of finished flatwork concrete? Could it cause uneven discolorations in the cured concrete?

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admin
1156 posts
TimePosted 22/08/2006 10:21:13
admin says

Re: Chemicals

Triethanolamine is used as a set controlling chemical in concrete admixtures. However, I am not aware of it causing differences in appearance of the surface of finished concrete. That phenomenon sounds more like effluorescence.

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