pozzolan with andradite and process for the production of pozzolan with andradite formed in-situ

摘要

the request in question deals with a pozzolanic material containing at least 2% of andradite (ca3fe2 (sio-4) 3) produced in situ in its composition. pozzolana is obtained from red clay which, when mixed with limestone (50 to 97% red clay and 3 to 5% limestone), is calcined at a temperature between 900 and 1300 ° C, with the formation of andradite in situ. the process in question allows the use of red clay, with a high content of fe3 +, by converting hematite (fe2o3) into andradite. the final material has a gray color and does not change the color of the cement when added.