Estudo do ganho de resistência e da estabilização química pela adição do coproduto KR no melhoramento de solos argilosos

Abstract

Due to the increase in the demand for construction, there is a growing need to build in regions where the soil does not present conditions of minimum resistance adequate to receive loads. In the sense of making these regions useful to civil construction in general. It is fundamental to guarantee the knowledge of soil properties and techniques capable of improving their geotechnical performance. The removal of inadequate soil is not always possible from a technical and economic point of view, either by the size of the area of occurrence of the material or by the thickness and depth of the layer. In many cases stabilization techniques present themselves as a more efficient solution and are therefore widely used in the geotechnical environment. For this reason, this research aims at deepening the knowledge of soil stabilization techniques and evaluating the use of a new steel product, the KR desulfurization co-product (KambaraReactor) as a chemical stabilizer for low consistency soils. The KR co-product, which has been reclaimed in the steelmaking process, has also been used successfully in other areas of civil construction for promoting improvements in soil characteristics and for being abundant in the region. In order to better know the co-product and to evaluate its potential as a stabilizer, characterization tests of the co-product and soil were carried out. In this phase, particle size analysis, specific gravity, PennsylvaniaTestingMethod (PTM) expansion, pozzolanicity, x-ray diffraction and x-ray fluorescence were performed for the co-product and for a high plasticity soil the geotechnical characterization, diffraction and fluorescence -x. In a second moment, in order to evaluate the action of the coproduct, tests of non-drained resistance, Vane Test, Cone Fall Test and of unidimensional density with the natural soil for the mixtures were reanalyzed. The results indicated that the co-product is capable of promoting increase in the soil's non-drained resistance, presenting pozzolanic behavior and that the resistance gain is due to the moisture of the samples and the fineness of the co-product used.