Per: Davi Vaz André Júnior (UENF), Madeleing Taborda Barraza (UFSC), Leandro Barbosa de Oliveira (UENF), José Alexandre Tostes Linhares Júnior (UENF), Iully da Silva Amaral Pereira (UENF), Juliana Fadini Natalli (UENF), Sérgio Neves Monteiro (IME), Carlos Mauricio Fontes Vieira (UENF), Afonso Rangel Garcez de Azevedo (UENF)
Abstract:
Portland cement is one of the most consumed materials in civil construction, however, the production of the binder requires some steps such as clinkerization, involving the burning of limestone, thus emitting a high load of carbon dioxide, the main cause of the greenhouse effect. Thus, geopolymers, which belong to a group of activated alkali materials, appear as a possible substitute for Portland cement, as they are more sustainable. Coffee residue contains a high amount of potassium oxide, which is highly alkaline, a fundamental characteristic for possible activating solutions for geopolymeric materials. Thus, the objective of this study was to analyze the properties in the fresh state of a geopolymer activated by coffee residue ash, calcined in a laboratory oven at 700°C for 1h and using metakaolin as a precursor. A chemical analysis of the ash was carried out, in addition to consistency, fresh mass density and viscosity tests. The material containing the residue showed a lower workability, however close to the reference mix. Proven fact with the decrease of spreading and the increase of viscosity. Density increased with increasing ash content.