GEOPOLYMER CEMENT OF THE CALCIUM FERRO ALUMINOSILICATE POLYMER TYPE AND PRODUCTION PROCESS

摘要

The invention relates to a geopolymer binder or cement of ferro aluminosilicate [ Fe O Si O Al O ] polymer type which after curing consists of a geopolymer compound in which some of the Al atoms are substituted with Fe atoms the whole satisfying the following raw formula: (Ca Na K)·(FeO)·(SiOAlO)·(SiO) in which "x" is less than or equal to 0.5 and "y" is between 0 and 25. This geopolymer binder or cement is the result of the geopolymerization of calcium geopolymer type with geological elements rich in iron oxides and in ferro kaolinite coming from the weathering of acid rocks such as granite and gneiss or of basic (mafic) rocks such as basalt and gabbro. The process for manufacturing this geopolymer binder or cement consists in treating said geological elements at a temperature of 600 to 850°C. During this heat treatment all the iron oxides [goethite FeO(OH) + magnetite FeO] are transformed to hematite FeO and the ferro kaolinite becomes ferro metakaolin of Fe MK 750 type and then these are made to react with a reaction mixture of calcium geopolymer type.