Evaluation of Geopolymer Composites, Based on Red Mud and Metakaolin, for Building Application

Portland cementCements is widely used in civil construction, although its production involves the emission of high amounts of carbon dioxide. GeopolymersGeopolymer have been studied as an alternative to replace Portland CementCements. These materials can be produced using wastesWastes and they are less aggressive to the environmentEnvironment. The aim of this work was the physical and mechanical evaluation of geopolymersGeopolymer composites based on red mudRed mud and metakaolinMetakaolin as precursors and sodium hydroxide (NaOH) as activator. Compressive strengthCompressive strength tests were performed in ten mixturesMixture with different percentages of the precursors and sand. The water absorption index and microstructural analysis were also determined. Furthermore, durability tests were performed on the composites, in order to allow complete characterizationCharacterization and suggestions of applicability in civil construction. The results showed that the composites have physical and mechanical characteristics that comply with the standards and good durability performance. Therefore, they can be used to produce construction bricks.