Outlook and developments
Carbon-free concrete through the use of hydroxide and/or alkaline silicate - Cement- free concrete

For alkaline silicoaluminous concretes, the raw materials used are metakaolin, metallurgical slag, fly ash, coal slag and mining waste. The materials are activated with alkali hydroxide and/or alkali silicate.

Heating such a mixture to a temperature below 90°C would generally be conducive to maximum performance. Such concretes behave favorably compared to Portland concretes in :

• resistance to acidic environments;

• temperature and fire resistance ;

• protecting reinforcement against corrosion.

To date, there are no publications on their performance compared with that of aluminous cement.

Sodium silicate-lime binder concretes are of interest for :

• ...