Name: LUCAS OLIVEIRA BRIDI
Type: MSc dissertation
Publication date: 14/02/2020
Advisor:
Name |
Role |
|---|---|
| PATRÍCIO JOSÉ MOREIRA PIRES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| JAMILLA EMI SUDO LUTIF TEIXEIRA | Co advisor * |
| JOÃO LUIZ CALMON NOGUEIRA DA GAMA | Internal Examiner * |
| PATRÍCIO JOSÉ MOREIRA PIRES | Advisor * |
Summary: The steel slag originated in the Kambara reactor is a co-product of the molten iron desulfurization process, which, after beneficiation, has been shown to be an efficient soil stabilizer, according to technical-scientific literature and recent national experiences in geotechnical and paving engineering, especially in stabilization of soils. There is, however, still a certain deficiency in the knowledge around the issues related to the stabilization mechanisms, and how these mechanisms act in different scenarios of soil-KR interaction, different mainly due to the soil granulometry, or more specifically, depending on of its fine content. Complementarily, in the contribution to this deficiency, this work will characterize physically, mechanically and chemically soil-KR mixtures, different according to the soil fines content (56.6%, 42.7% and 28.9%, respectively). From the granulometric analysis, it was observed that the desulfurization by-product KR has its most expressive effect restricted to the thickest granulometric bands, with fine gravel and medium gravel. In the analysis of the degree of flocculation, there were no appreciable changes, since these soils, of lateritic formation, according to the MCT classification, already had the full flocculated clay size range. From the analysis of the assortment complex, it was observed that Ca2+ is the main exchangeable cation (99.3%). In this conception, the higher the CTC value of the soils, the greater the promotion and maintenance of the cationic exchanges guided by Ca2+. From the microscopic analysis, the formation of structures was identified, filling gaps and joining adjacent grains, possibly originating from hydration reactions, transformations also signaled in the analysis of mineralogy at different ages. It is concluded that the chemical stabilization occurs mainly through mechanisms of cationic exchange and hydration reactions, with the presence of clay minerals of the finer fractions being essential, reinforcing the importance of soil granulometry in the efficiency of the soil stabilization with KR desulfurization by-product technique.
Keywords: Desulphurization slag; Soil stabilization; Fine content.
