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Portland's bill


I have just read the September 2006 supplement New Concrete Engineering. While I applaud the efforts of NCE and the Concrete Centre in the promotion of the material, and its energy efciency, nowhere can I find any comments on the CO 2 emissions released into the Earth's atmosphere by the production of cement.

It is estimated that the manufacture of 1t of cement produces about 1t of CO 2 - and approximately 7% of total global CO 2 emissions are from Portland Cement production.

Surely one of the quickest, simplest and most efficient ways of reducing CO 2 emissions is to use modern admixture, mix design and cement replacement technology to reduce the Portland Cement content of concrete mixtures?

But then again, isn't the Concrete Centre sponsored by the cement companies?

Charles Allen, director, OtB Engineering, Unit 4 La Gare, Surrey Row, London SE1 0BZ

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