Physical-Chemical Characteristics of Cane Bagasse Ashes used in the manufacturing of concretes

摘要

Different types of residue have been used as mineral addition to Portland cement’s concrete, aiming to minimize the environmental impact caused by the cement industry. This way, it adds value to an environmental passive, diminishes the consumption of an agglomerate which production demands natural resources withdraw, and carbon dioxide rehearsal. The most used residues are fly ashes and blast furnace slag. However, recent work has shown that ashes produced by finely ground sugar cane bagasse can also be used as pozzolanic material, depending on the temperature and time used on the burning, being those responsible for the variation of the process that determine the perceptual and structure of silica crystals found in the residue. Considering these factors, in a same sugar cane bagasse burning process different types of ashes are produced: furnace ashes, pre air ashes and the exhaust ashes. According to studies stated in the literature, usually the producer plant is identified but it doesn’t specify the types of ashes. In this work the physical-chemical characteristics of the four different types of ashes found in nature, obtained in a distillery using a controlled burning process, are evaluated. X-ray diffraction (XRD), x-ray spectrometry fluorescence (XRF), pozzolanicinity test and Scanning electron microscope (SEM) will be used in this study. The results show that the ash produced in the furnace is the most recommended to the production of cements of low environment impact and production of durable concrete.