ABSTRACT
Rice husk ash (RHA) is pointed out as the most promising Brazilian agricultural residue to be mixed with ordinary Portland cement. Therefore in a comprehensive study of the use of by-products in the Building Industry carried out at IPT the development of the
Abstract Brazil is a main rice producer and large amount of rice husk is
available close to the urban centers. A fluidized bed boiler (FBB), where the residence temperature and time can be controlled has been used in order to maximize the energy output as well as the ash pozzolanic activity. For non ground ashes the mechanical properties and pozzolanic activity of FBB ashes are far better than those from ordinary burnt ashes.
