Avaliação da viabilidade técnica do emprego de óleo degomado de soja como aditivo em pastas

Abstract

In the context of reducing the impacts of waste generation and raw material consumption, is discussed the possibility of replacing the use of common chemical additives, which are performance enhancers that change the properties of the compounds, with compositions of vegetable origin. Brazil produces in large-scale oils from Soybean, because of this, it is considered interesting to evaluate the possibility of using a by-product from this production. With this, the present research aimed to technically analyze the feasibility of using the by-product of soybean oil, Degummed Oil, as an additive. For this, laboratory experiments were carried out to analyze the influence of the addition of the by-product on the properties of consistency, water retention and mechanical strength, by means of Flow Retention, Mini Slump, Incorporated Air Content and Compression Strength tests. These tests were carried out in pastes, which are the base material for concrete and mortar, thus allowing a more assertive view of the interaction of oil with the materials involved. For this purpose, were produced pastes with potential agglomerant materials such as Gypsum Residue and Sand-Silt Clay Soil, and also with common agglomerants: Hydrated Lime CH-III and Portland Cement CP-II-F-32. In the results, it was observed a good interaction of the soil with the oil in relation to fluidity and workability, through the significant improvements, showing the viability of the by-product to be a plasticizer or superplasticizer additive. Favorable results were also obtained regarding the possibility of the oil being used as an Air Incorporating Additive and Set Retardant in all materials tested (with the Gypsum Residue tested in the fresh state only for the incorporation of air), with the exception of Lime, which proved to have a harmful interaction with the object of analysis, due to the appearance of exuding phenomena, and decreased fluidity. However, for all agglomerants (common and alternative) tested, were obtained negative results regarding the use of degummed oil in relation to compressive strength.