Estudo da obtenção de geopolímero a partir da ativação de granito cinza corumbá

Abstract

Geopolymeric cement is a binding system used in alternative concrete and mortars. It is obtained by alkaline activation of silica and alluminum rich materials like metakaolin and volcanic ash. Literature research indicates that residues such as fly ash and mud can also be employed as raw materials for the production of these cements. Granite is an Al and Si rich material and its dust is an environmental liability. It would be interesting to activate this dust aiming the production of geopolymeric cement. In this context, this paper proposes to evaluate the activation of dusts of Cinza Corumbá granite ( aproximately 18 m) produced in laboratory in order to have more control over the variables of theexperiment. Powders in natura and calcinated at 700oC were evaluated. DRX indicated a predominantly crystalline material. Pastes and mortars were obtained, with high compressive strenght. The highest compression strenghts were verified in axial compression tests on samples produced with in natura powders, cured in heater reaching 33 MPa in 3 days and 36 MPa at 28 days. Mortars produced with in natura and calcinated powders, cured in heater, presented mechanical resistence to compression of around 20 and 50 MPa at 3 and 28 days respectively.