Desenvolvimento de geopolímero a partir de cinza de olaria, refratário dolomítico Post-Mortem e metacaulim

Abstract

This work focused on studying and developing a material with cementitious properties. This is an inorganic polymer formed by the activation of aluminosilicate (Al2O3.SiO2) amorphous, which react in a strongly alkaline medium, called geopolymer. Waste have been widely used in the development of geopolymers. In this sense the raw materials used were pottery ash (COL) and dolomite refractory post-mortem (RDPM) as a source of silica and calcium; respectively and the alkaline medium is sodium hydroxide (NaOH) used as an activator. To increase the reactive properties of pottery ash along with RDPM was added metakaolin, obtained by calcination of flint kaolin Paragominas at 550 ° C. The raw materials, and samples geopolymeric undergone characterization and the main analysis involved in the process were: X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric analysis (TG) and differential thermal analysis (DTA). Also apparent density tests were performed, with densities according to literature data, and the compressive strength tests to evaluate the degree of polymerization, since the more the structure is polymerized, the greater the resistance. With 3 days of curing the geopolymeric folders reached compressive strength of up to 11 megapascals (MPa) and with 28 days of curing approximately 24 MPa. The best results were obtained by formulation II, with a Si/Al ratio of 6:1. The characterization results obtained from the analyzes of the samples were satisfactory and showed that the raw materials, COL, metakaolin and RDPM, when activated with sodium hydroxide, are a viable alternative for the production of geopolymeric materials