Influence of the variables involved in the planting of rice in the rice husk ash’s characteristics

Abstract Rice production in Brazil in 2008 was approximately 12 million tons, and to achieve that amount several planting techniques were used with different strains of rice in different rice-growing areas. Since Rice Husk Ash (RHA) is the pozzolan of vegetable origin that is most studied by researchers working in the field of pozzolanic materials, this paper evaluates the influence that the form of planting, climate, soil, strain of rice and the origin/amount of nitrogen-based fertilizers used in rice cultivation have on the chemical composition and crystallographic properties of RHA. The results obtained in this study confirm the importance of carrying out routine chemical analysis and X-Ray diffraction to maintain the quality control of the CCAs produced because in situations of large-scale production, husks of different origins may be used.